Grow guide · Australian edition

The Australian planting calendar

Use this outdoor cannabis planting calendar for Australian seasons. Compare when to sow, grow, flower and harvest from September to May, then choose the climate zone closest to your garden for month-by-month guidance.

Your growing zone

Hot & humid QLD, NT, northern WA Temperate NSW, VIC, SA, ACT Cool & short season TAS, alpine regions

Season at a glance — Hot & humid

Sow
Veg
Flower
Harvest

Hot & humid growing calendar from September to May
Seed type	Sep	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May
Photoperiod	Sow	Sow	Veg	Veg	Flower	Harvest	Harvest	No scheduled phase	No scheduled phase
Autoflower	Sow	Sow	Sow	Harvest	Sow	Sow	Harvest	Harvest	No scheduled phase

Hot & humid: The enemy is autumn humidity, not cold. Start early, pick mould-resistant strains, and aim to have everything down by the end of March — one wet April week can take the lot.

Dates that matter

Sep – Oct

Last frost

Nothing goes outside before it. Check your local average, not the national one.

22 – 23 Sep

Spring equinox

Days are now longer than nights — the season officially opens.

21 – 22 Dec

Summer solstice

Longest day. Photoperiods begin flowering as nights lengthen after it.

Mar – May

Harvest window

Read the plant, not the calendar: cloudy trichomes, darkened pistils.

Month by month — Hot & humid

What to actually do each month, for the zone you picked above.

September

Sow

Germinate now — the earlier start beats the autumn wet.

October

Sow

Plant out; mulch heavily against heat.

November

Veg

Last photoperiod sowing; first autos ready to pot on.

December

Veg

Veg care: deep, infrequent watering. Thin interiors early.

January

Flower

Flowering begins; watch for mould after storms.

February

Harvest

Peak flower. Keep canopies open and airy.

March

Harvest

Main harvest month — beat the autumn wet.

April

Harvest

Late harvests only; watch every forecast.

May

Off season

Season over. Dry, cure, and plan next year.

Season at a glance — Temperate

Sow
Veg
Flower
Harvest

Temperate growing calendar from September to May
Seed type	Sep	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May
Photoperiod	Sow	Sow	Sow	Veg	Veg	Flower	Harvest	Harvest	No scheduled phase
Autoflower	Sow	Sow	Sow	Sow	Sow	Harvest	Sow	Harvest	Harvest

Temperate: A long, generous season that suits a broad range of cannabis seeds, including longer-flowering varieties when started early.

Dates that matter

Sep – Oct

Last frost

Nothing goes outside before it. Check your local average, not the national one.

22 – 23 Sep

Spring equinox

Days are now longer than nights — the season officially opens.

21 – 22 Dec

Summer solstice

Longest day. Photoperiods begin flowering as nights lengthen after it.

Mar – May

Harvest window

Read the plant, not the calendar: cloudy trichomes, darkened pistils.

Month by month — Temperate

What to actually do each month, for the zone you picked above.

September

Sow

Germinate indoors; harden off after the last frost.

October

Sow

Plant out; establish and mulch.

November

Sow

Last safe photoperiod sowing; top and train now.

December

Veg

Peak veg. Tie down, feed lightly.

January

Veg

Final training before the stretch; sow the last auto round.

February

Flower

Flowering begins; thin the canopy.

March

Harvest

Bulk flowering; watch humidity closely.

April

Harvest

Main harvest month for most strains.

May

Harvest

Late sativas finish — beat the first frost.

Season at a glance — Cool & short season

Sow
Veg
Flower
Harvest

Cool & short season growing calendar from September to May
Seed type	Sep	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May
Photoperiod	No scheduled phase	Sow	Sow	Veg	Veg	Flower	Harvest	No scheduled phase	No scheduled phase
Autoflower	No scheduled phase	Sow	Sow	Sow	Sow	Harvest	Harvest	No scheduled phase	No scheduled phase

Cool & short season: A twelve-week window. Fast photoperiods and autos only — anything rated 11+ weeks of flower will not finish before frost.

Dates that matter

Sep – Oct

Last frost

Nothing goes outside before it. Check your local average, not the national one.

22 – 23 Sep

Spring equinox

Days are now longer than nights — the season officially opens.

21 – 22 Dec

Summer solstice

Longest day. Photoperiods begin flowering as nights lengthen after it.

Mar – May

Harvest window

Read the plant, not the calendar: cloudy trichomes, darkened pistils.

Month by month — Cool & short season

What to actually do each month, for the zone you picked above.

September

Off season

Too early — soil is still cold. Prepare beds.

October

Sow

Germinate indoors; out after the last frost.

November

Sow

Last sowing for everything. Choose fast finishers.

December

Veg

Veg hard while the light lasts.

January

Veg

Final training; autos from October begin flowering.

February

Flower

Flowering. Cold nights now sharpen colour.

March

Harvest

Harvest fast finishers; watch overnight lows.

April

Off season

Final harvests before frost.

May

Off season

Season over. Clean up, compost, cure.

Planning your season

How to use this Australian outdoor cannabis calendar

Choose the climate zone closest to your garden, then compare the photoperiod and autoflower rows. Each row shows a typical outdoor window for sowing, vegetative growth, flowering and harvest from September to May.

Use the dates as planning guidance, not a fixed promise. Local frost, rainfall, humidity, daylight and cultivar flowering time can shift the season. Read the monthly notes and check the laws that apply in your state or territory before buying, germinating or growing cannabis seeds.

Read the Australian outdoor grow guide Check cannabis laws in Australia