Grow calendar Australia

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Outdoor grow calendar Aussie

Unfortunately, due to restrictions, we are no longer able to ship to Australia. It truly pains us to not be able to help out our loyal Australian customers, and we hope this situation will change one day! Do feel free to sign up to our newsletter, download our Grow Bible, and join our community forum. That way you stay up to date for when the opportunity arises.

The Australian grow season runs from August through April (give or take a few months, depending on your specific location and situation). This grow calendar will help you with your growing endeavors for the next 7-9 months. It includes averages for day lengths and temperatures to help you get a better idea of what you can expect when growing weed in Australia.

This is an excellent way to help new (and old) growers know how to plan their grow season and best budget their time. Even though it feels early, it is important to start preparations for your grow season now. Happy growing!

The first half of this article covers Eastern, Western, Southern Coasts and Central Australia.

Click here to head to the calendar for northern Oz or go here for the U.S. grow calendars.

Aussie grow facts

  • Averages are based on Melbourne, Perth, and Brisbane
  • The hottest days are experienced in the desert or the interior of Australia
  • The Southeastern tip of Australia (including Tasmania) has a temperate climate, meaning it is cooler and wetter than the rest of the country
  • The main difference between the desert (central Australia) and the coast is the fact that it is hotter and dryer. This means growers should simply take care to water their outdoor plants more frequently and in higher quantities.

Make sure to download my free Grow Bible if you’re just starting out growing marijuana in Australia!

Grow Bible

  • Grow with my Quick Start Guide
  • Discover secrets to Big Yields
  • Avoid common grow mistakes


    August

    Average day length: 10.5 to 11.5 hours
    Average temperature: 8 to 18 degrees Celsius

    The Desert:
    Average day length: 11 to 11.5 hours
    Average temperature: 7 to 23 degrees Celsius

    This is the perfect month for preparing for the future grow season. Especially in the warmer regions of the Australian coastline, the worst of the colder weather is soon to be history, and it’s time to prepare your grow area and your plants. It is unlike there will be any frost to worry about any more, meaning you can almost start growing in August.

    buy your seeds

    For that reason, you should order your seeds and begin the germination process as soon as you can. Since the growing season can last for a while in most parts of Australia, a plant that has Sativa dominant genes should do just fine in an outdoor grow setting. Indicas don’t fare as well in the heat that is to come, so be sure you know what you’re getting when you research and order seeds.

    Ideally, seedlings will grow somewhere between
    20 to 25 degrees Celsius, so unless this month is unseasonably warm, it’s a good idea to start your seedlings indoors and then wait until the temperature rises consistently enough to bring them outside. If you are growing your plants exclusively outdoors, you had better wait a while. While you wait, prep your soil with compost and worms.

    If you are planning on cloning, it’s a good idea to begin growing the mother plant this month (ideally indoors). That way you can take the cuttings when it is still early in the grow season.

    September

    Average day length: 11.5 to 12.5 hours
    Average temperature: 9 to 20 degrees Celsius

    The Desert:
    Average day length: 11.5 to 12.5 hours
    Average temperature: 11 to 27 degrees Celsius

    The risk of frost has dropped even more, especially in the warmer parts of the country. If you haven’t already, you should definitely buy your seeds by now. If you already have them and are prepared with your soil and other necessities, you can safely put your young plants on the windowsill to begin sprouting them.

    Start sprouting your plants

    Keep a close eye on the hours of daylight, as young marijuana plants need a minimum of 12 hours per day in order to get enough energy to grow. If you’re in the earlier part of the month where the daylight is still under 12 hours, supplement the natural light with a grow lamp. This is crucial because it prevents your plants from flowering early (which would be a huge waste).

    If you are growing a mother plant for cloning, be sure it is ready by the start of next month, so there’s enough time for the clones to grow outdoors over the next few months.

    October

    Average day length: 12.5 to 13.5 hours
    Average temperature: 11 to 22 degrees Celsius

    The Desert:
    Average day length: 12.5 to 13 hours
    Average temperature: 15 to 32 degrees Celsius

    If you are growing some of your plants on the windowsill, they won’t need any extra artificial light starting in October, as the amount of daylight is going up by quite a bit. Still, you are going to want your plants to receive the maximum amount of sunlight hours, so see if you can get at least 13 hours for your plants.

    start putting plants outside

    If the daily temperature is high enough (if you are living in the warmer parts of the country, for example), then you can remove your plants from the windowsill and place them outside instead. Once the daylight temperature rises to 21 degrees Celsius, this can be done. That said, be sure to bring your plants back in at night, since the temperatures will still drop lower then.

    If it applies to you, begin making your clones from the mother plant during October.

    November

    Average day length: 13.5 to 14 hours
    Average temperature: 13 to 25 degrees Celsius

    The Desert:
    Average day length: 13 to 14 hours
    Average temperature: 18 to 35 degrees Celsius

    Temperatures should finally be high enough that it feels like real spring — or even summer! During November it is now okay to bring your marijuana plants outside all day and night, as long as the temperature doesn’t drop below 15 degrees

    put your cannabis plants outside

    If you are growing autoflowering seeds, you can plant them during November so that you will be able to harvest towards the beginning of February.

    December

    Average day length: 14 hours
    Average temperature: 15 to 27 degrees Celsius

    The Desert:
    Average day length: 14 hours
    Average temperature: 20 to 36 degrees Celsius

    This is the last month that the number of daylight hours continues to increase. Starting in January, these hours are going to begin decreasing again. In other words, you can expect your marijuana plants to grow a huge amount during their vegetative phase this month.

    Plants are getting flowers

    The growth should accelerate and accelerate. If you are growing autoflowering marijuana plants, flowers will start to show up.

    January

    Average day length: 14 hours
    Average temperature: 17 to 28 degrees Celsius

    The Desert:
    Average day length: 13.5 hours
    Average temperature: 23 to 39 degrees Celsius

    January and February are the hottest months of the year, despite the fact that the hours of daylight decrease a bit. In January you can expect an autoflowering strain of marijuana to begin really flowering, producing large groups of flowers. Meanwhile, your “regular” (non-autoflowering) marijuana plants will start to form “pre-flowers.”

    January is an extremely important month for growers of marijuana from non-feminized (regular) seeds. If you bought feminized seeds, you could expect about half of your plants to be male. However, if they are not removed, the male plants will pollinate the females, greatly reducing your harvest.

    Male vs female marijuana
    Male vs female marijuana

    You can identify the sex of a plant by looking at the “pre-flowers” a couple of weeks before they are capable of reproducing, so it is important to use this time to identify any male plants and remove them.

    Cannabis gender can be confusing. Use this guide to understand marijuana gender and reproduction to achieve the best possible harvest.

    Also read “Sexing marijuana plants & reproduction

    You can identify males and females by looking at what grows between their nodes. To identify the males, keep an eye out for small pollen sacs, which resemble little grape-like balls. The females can be identified from their bracts, which are teardrop shaped and will eventually grow wispy white stigmas from their pistils.

    If you’re not sure of the sex of the plant, it’s a good idea to wait and see if a wispy white hair appears, telling you it is a female. But, watch the plants closely, and remove males as soon as you identify them.

    February

    Average day length: 13 hours
    Average temperature: 17 to 28 degrees Celsius

    The Desert:
    Average day length: 13 hours
    Average temperature: 22 to 37 degrees Celsius

    Once your plant reaches the flowering stage, it can thrive at a comfortable room temperature with low humidity. Unless you are adding additional CO2 to your grow room, a temperature under 28°C is ideal. These lower temperatures encourage potent, trichome rich buds that you can smell and enjoy before you burn them.

    dry your autoflowers now

    Don’t go over 28°C, as higher temperatures cause terpenes to evaporate and they also slow bud growth. If your buds are too hot during this time, you may be literally burning away the good stuff as they grow, leaving very little taste or smell by the time of harvest.

    Be especially careful to keep it comfortable for your plant after week 6 or 7. This is when terpene production is at its max, and you risk evaporating them due to high heat.

    March

    Average day length: 12 to 12.5 hours
    Average temperature: 16 to 27 degrees Celsius

    The Desert:
    Average day length: 12 to 12.5 hours
    Average temperature: 18 to 33 degrees Celsius

    Autumn is on its way, but the temperatures should still be relatively high. Nonetheless, the number of daylight hours are dropping so the grow season is fast reaching its conclusion.

    take marijuana plants inside

    If your plants are still hanging on and you haven’t harvested them already, it is probably a good idea to do that now.

    Our free little Harvest Guide will help you determine the best moment to cut your plants. Download it here.

    Harvest Guide

    marijuana harvest guide
    • Time your harvest for perfect taste
    • Get THC levels for a perfect high
    • Don’t waste any precious bud


      April

      Average day length: 11 to 11.5 hours
      Average temperature: 13 to 23 degrees Celsius

      The Desert:
      Average day length: 11 to 12 hours
      Average temperature: 13 to 28 degrees Celsius

      It is official: fall has arrived. April marks the definite end of the grow season. If somehow your plants are still going, harvest them now because the temperature could drop randomly and suddenly. If the weather gets cold or wet, then bud rot is a real risk (which would ruin your harvest). If you do discover bud rot, remove the entire bud immediately or else it will spread to the other buds.

      Bud rot on a plant
      Bud rot

      While the entire Australian coast clearly does not have the exact same climate, the most important thing is to be aware of what your particular region and weather patterns are like. Keep in mind that sunshine is key: if your plants are getting enough sunlight, they should do just fine.

      Northern Australia

      Australia’s Top End, which encompasses the northern half of the Northern Territory and the areas surrounding it in the northern part of the country has a particularly unique climate compared with the semi-arid Red Centre (central Australia). While the Red Centre (and most of the rest of Australia) has four distinct seasons, the Top End has just two: the wet season and the dry season. Averages in this article are based on values from Katherine and Darwin, two cities in the Northern Territory, Australia.

      Although warmth is never a problem in the tropical Top End, sunlight is surprisingly hard to come by. The daylight hours are quite a bit shorter in the Top End compared to the more arid southern regions of Australia, so it’s important to stay on top of how many hours of light are available for your plants. Some growers opt for autoflowering strains and grow two sets of marijuana plants since they are not photosensitive and the tropical grow season can last longer due to the warmer temperatures.

      Since the grow season corresponds with the wet season (the time when most of the country is in its summer months), marijuana plants are at the highest risk for mildew and mold in the Top End. The main reason growers need to think about this fact is the fact that they can order seeds from plants that are more resistant to powdery mildew and other such problems, to begin with. This will help combat the potential for it.

      Powdery Mildew

      Powdery mildew (sometimes referred to as “white powdery mildew”) can decimate crops and entire marijuana gardens. It looks like white or gray powder is growing on the leaves of your marijuana plants. This type of fungi can spread easily and quickly, consuming everything in its path.

      Also read “Stop powdery mildew on marijuana plants

      Climates that include a high humidity (such as the tropical region of the Top End) tend to encourage the growth of powdery mildew. Anything above 55% humidity is comfortable for powdery mildew to develop – and the Top End consistently has the humidity in the 70% and 80% range. If your buds are infected with powdery mildew, the entire bud is ruined – so stay vigilant!

      August

      Average day length: 11.5 to 12 hours
      Average temperature: 17.5 to 32 degrees Celsius

      At this point, you should be preparing (at least mentally, if nothing else) for the grow season ahead. While frost is never a risk here in the tropics, you can still wait until September to plant your plants since they will be cozy and warm.

      Start sprouting your seeds

      Prepare for the grow season by ordering your seeds (preferably ones that have a strong resistance to mildew and mold) and preparing your growing area. Because seedlings grow best in temperatures between 20 and 25 degrees, next month will be perfect for planting with its warmer temperatures.

      September

      Average day length: 12 hours
      Average temperature: 21 to 32 degrees Celsius

      Buy your seeds now if you haven’t already. Start sprouting your plants once the number of daylight hours exceeds 12 per day. If that is not practical for you, you can begin sprouting the seedlings in the windowsill and supplement them with artificial light. If your plants aren’t receiving enough sunlight, they could flower early – unless they are autoflowering marijuana plants, of course.

      sprouting seeds in the window

      Begin seriously growing any mother plants you might want to use for clones, as you will want to clip them next month already.

      Once your plant reaches the flowering stage, it can thrive at a comfortable room temperature with low humidity. Unless you are adding additional CO2 to your grow room, a temperature under 28°C is ideal. These lower temperatures encourage potent, trichome rich buds that you can smell and enjoy before you burn them.

      Don’t go over 28°C, as higher temperatures cause terpenes to evaporate and they also slow bud growth. If your buds are too hot during this time, you may be literally burning away the good stuff as they grow, leaving very little taste or smell by the time of harvest.

      Be especially careful to keep it comfortable for your plant after week 6 or 7. This is when terpene production is at its max, and you risk evaporating them due to high heat.

      October

      Average day length: 12 to 12.5 hours
      Average temperature: 25 to 35 degrees Celsius

      Now that the average daylight has exceeded 12 hours per day, you can move your marijuana plants outdoors safely. Since the temperatures tend to start getting pretty hot in October, you had better make sure your plants have enough water.

      sprouting cannabis outside sun

      The rain will start up starting in November and especially December, making this aspect easier for the grower. Start cutting your clones from the mother plant this month (if you are cloning).

      November

      Average day length: 12.5 to 13 hours
      Average temperature: 25 to 35 degrees Celsius

      Your plants should be growing nicely by now. If you are growing one set of autoflowering plants, you should plant them during this month so that you can harvest at the start of February. Of course, everything varies according to the specific strain, so be sure to do your homework before making any rash decisions.

      growing outdoor

      This is the hottest month of the year, so keep making sure your plants are getting enough water. If it is a particularly wet November, the rain could help – but remember, it could also lead to the development of mold.

      December

      Average day length: 13 hours
      Average temperature: 25 to 34 degrees Celsius

      grow calendar first pistils

      Your plants should be growing extremely well by now. They should be in the maximum growing time for the vegetative phase, meaning they should be shooting upwards and outwards. If you have planted autoflowering marijuana plants, you can expect them to begin flowering sometime this month.

      January

      Average day length: 13 hours
      Average temperature: 24 to 32 degrees Celsius

      While January is on the warmer side of the Top End Australian climate, it is also the wettest month of the year. For that reason, mold and mildew are at their greatest risk. Stay vigilant.

      This is a busy month for growers since “pre-flowers” will begin to grow and you should check to see which plants are male (assuming you purchased feminized seeds rather than feminized ones). About half of your plants should be male, but should be removed or they will pollinate the females, greatly reducing your harvest.

      drying cannabis strains

      You can identify the sex of your plant by looking at the “pre-flowers a couple of weeks before they are capable of reproducing, so it is important to use this time to identify any male plans and remove them. You can identify males and females by looking at what grows between their nodes. To identify the males, keep an eye out for small pollen sacs, which resemble little grape-like balls. Females can be identified from their bracts, which are teardrop shaped and will eventually grow wispy white stigmas from their pistils.

      February

      Average day length: 12.5 to 13 hours
      Average temperature: 24 to 32 degrees Celsius

      It has probably reached the harvesting point for your autoflowering plants if that is what you planted. Clip the buds and hang them to dry. They should dry slowly but steadily over the course of about ten days. They are dry once a branch cracks when you bend it.

      plant ready to harvest

      The daylight hours have started to decrease again, meaning the harvesting time for your regular marijuana plants is on its way too. February still has plenty of rain, but things should start to die down again in March or April.

      March

      Average day length: 11 to 12.5 hours
      Average temperature: 23 to 33 degrees Celsius

      The weather remains warm (as usual), but it is a good time to harvest your marijuana plants during this month simply because the daylight hours are getting down to the 12-hour mark. Some tropical growers opt to keep growing their plants for as long as possible, but it is up to you.

      April

      Average day length: 11.5 to 12 hours
      Average temperature: 22 to 33 degrees Celsius

      The dry season is finally on its way, and you should harvest soon. Bud rot is still a risk because humidity remains high (and so does temperature, for the most part). If you do discover bud rot on any of your plants’ buds, remove those buds immediately and discard them because it could easily spread to the entire harvest.

      bud rot weed

      Hang your plant product up to dry after harvesting, and it should slowly dry over the course of 10 days. Make sure the drying room isn’t too humid, as bud rot could still easily develop.

      Enjoy your summer harvest!

      FAQ about growing marijuana in Australia

      Can you grow medical weed in Australia?

      Yes, you can. If you’re interested in growing weed, consider buying your seeds from a reliable seed bank like I Love Growing Marijuana (ILGM).You’ll also get tons of useful resources, and a free grow calendar to help you get started.

      Where does weed grow in Australia?

      Weed can grow anywhere in Australia. All you need is a reliable grow calendar to help you with your growing endeavors and increase your chances of having a successful harvest.

      Does weed grow wild in Australia?

      Unfortunately, there are no native species of cannabis in Australia. But that doesn’t mean that you can’t grow your own weed. Check out this article for more information on seed banks that ship to Australia.


      Practice and learning are what it takes to become a pro grower! Feel free to visit my blog for all the grow information you need.

      What’s your favorite strain to grow in Australia? Share with us in the comments!

      Happy growing!

      Robert

      Avatar for Robert Bergman

      Robert Bergman

      Robert Bergman is an Amsterdam-based marijuana grow expert who has years of experience from small grows to massive operations. His passion for growing led him to develop his own Gold Leaf strain. Now, Robert is dedicated to sharing his knowledge with the world.... [Read full bio]

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        31 comments on “Grow calendar Australia”

        1. You forgot may june july ???? And please dont tell me you cant plant in these months ???

        2. Northern lights ,it’s the only strain resiliant to fungus and produces a massive yield with beautiful Looking crystal buds

        3. Hi Steve,
          I’m in the south west of west aussie. And have grown for many years (some good,some bad) and I would say yeah I have always harvested no later than may here in west!..(usually April) depends on the strain of weed. Just harvested a crop of top shelf super skunk with an average of 17ozs per plant (4 plants in total)…

        4. I started my sativa strains on fathers day September. I harvested now in mid April.
          Two plants. 2m high, 2m wide.
          One plant 3lbs of dry buds. 2nd plant is hanging now it’s definetly got more on it. I’m predicting
          4-5lbs of dry buds.
          It’s been an epic season. Very dry and hot summer then a very late rain season. Biggest yields of bud I’ve ever achieved outdoor. Starting some autoflowers now for winter and then again another big sativa for next season in September.
          Soil preparation is a must for any successful outdoor organic grow.

        5. I was stupid for using this. I’m in Melbourne and your harvest time is about 6-10 weeks out. I won’t be harvesting my indica for another 5-6 weeks yet and the sativa will go until mid-May.

        6. I have done everything you discussed started in August as a bit of fun it’s 6.2.20 I’m in Tasmania the girls are very healthy heaps of bud growth but at least 6to8 weeks to go yet can’t wait yum yum

        7. Great work great company keep it up . And could you make the aussie growing calander available in the PDF form . Or within the grow bible . Thank you again

        8. Thanks Chris. you are right. sometimes the person translating the article from dutch to English makes a mistake. I iwill pass this up the chain to the office for editing. Peace

        9. Hi, you may be well intentioned, but a lot of information here is dead wrong. E.g daylight hours decrease after late December in southern australia, but you have them increasing in january. Another: you refer to females producing pollen! I hope your free guides are more useful.
          pS I dont know why this message box puts all text in caps.
          Cheers/

        10. It’s end of November, a couple have failed. Is it wise to plant more seeds?
          I have reservations as I don’t know how long veg period is… is it worth it?

        11. Hey Nettie , we like to germinate via moon cycles , first full moon in September which is start of spring . it’s really just a hippie thing don’t think it actually makes a difference , we also try harvest on moon cycles mainly new moon either April or May whereever it falls , as long as old Mary Jane is ready that is . Again it’s just a hippie thing can’t prove if it makes a difference or not

        12. Growing for over 20 years in OZ and never have I harvested any earlier than back end of April / Early May ..
          There’s a saying out in Byron Bay , Australia’s weed capital ….
          Plant Father’s Day
          harvest Mother’s Day .
          Peace out

        13. Joey,
          Outdoors plants get bigger and tend to take longer to finish. I noticed the days are over 13 hours in December, so I have reservations about your deadline. it might take you until January to finish outdoors. Hope this helps, and I invite you to join our forum. Good day mate, and happy growing! 🙂

        14. Hello everybody Being and indica can I plant in September and finish by Christmas. Sydney weather all outdoor…thanks

        15. Hello everybody .just like to know if I planted a indica outdoor in Sydney in the start of September would it finish around Christmas time? Being and indica with a short lifespan? Anything at all would be a great help.thanks

        16. What effect does the moon(light) have on outdoor growing? Do the phases have to be factored into the light/dark cycle?

        17. Adelaide as it has winters with out frost for outside plants (not the hills as they frost)

        18. Hey, so is there is any suggestions on the “perfect” climate place in Australia?
          Thank you!

        19. Steve,

          #1…When you say Oz to me I think of ounce, and/or the prison in one of those cable networks. 2ndly; I do not understand what you are talking about. In one sense it sounds like all is good but, then you go off on this 13 hours of daylight. Plants can begin flowering at 15 hours of darkness, 13 hours of light. A season is a season regardless of where you are.

          I just do not understand where you are coming from. Sorry. Join our forum and perhaps we can come to an understanding on terms and language in order to communicate smartly. Thanks

        20. steve is right you’ll never harvest in south eastern Oz before the end of march …its march 12th now and my thc bombs are still 2- 3 weeks away from being ready pure sativas can go to the end of april and into may… the grow season in south eastern Oz starts in september not august although you can supplement the light indoors or in a greenhouse we still get random frosts here in early september…

        21. fathers day to mothers day Sep to May is traditionally the growing season here although sometimes you can be done by mid April. I don’t think any oz outdoor growers would argue with that.

        22. yes but there’s no thc in them and the idea that you need to pull while there is still 13 hours of daylight is just plain wrong Its 20 Feb now and my plants are covered in pre buds that have at least5 weeks left.No one pulls plants in oz in Feb. not ever.

        23. steve,

          Thanks for your clarification. Keep in mind; The plant can start flowering before the 12/12 equinox.

        24. ok so in southern australia a photoperiod or regular female outdoor plant wont have mature buds until at least the 1st week of april . because the equinox or 12/12 light cycle dont happen until around the 3rd week of march this signals the plant to go fully flowering stage, and you will need at least 2 weeks from there,You would never pull outdoor plants in oz in march or feb??

        25. ok so in southern australia a photoperiod or regular female outdoor plant wont have mature buds until at least the 3rd week of april but more like early may . because the equinox or 12/12 light cycle dont happen until around the 3rd week of march this signals the plant to go fully flowering stage, and you will need at least 4 weeks from there,You would never pull outdoor plants in oz in march or feb??

        26. Thank you for all the detailed information.There should be no excuse for an unsuccessful grow.Thanks especially for the Aus calender.