When to Plant Sweet Corn in Cairns, Tropical Guide
Sow January to November. Right now in September you can sow.
Also called corn, maize.
Published · Last reviewed · By Garden Buddy
Growing advice is reviewed by hand. Planting dates, current conditions and prices on this page update daily.
This Sweet Corn guide is written for the Tropical zone, which takes in Cairns, Townsville and Darwin. Somewhere else? Your postcode picks the right one.
Not your zone? Brisbane Sydney Melbourne Canberra Alice Springs Perth
Also handy: will it frost this week? and what grows in shade.
Photo: Wikimedia Commons
Sweet corn is a warm-season grass requiring block planting for wind pollination. Freshly picked corn is dramatically sweeter than shop-bought because sugars convert to starch within hours of picking. Requires significant space (minimum 4x4 block) and cannot be grown as single plants or rows.
Planting Calendar for Tropical
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S/T/D | S/T/D | S/T/D | S/T/D | S/T/D | S/T/D | S/T/D | S/T/D | S/T/D | T/D | T/D | - |
S = Seed Tray T = Transplant D = Direct Sow
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Current Growing Conditions
Soil temperature: 21.4°C (optimal range: 16–35°C) ✓ Ready to plant
Modelled from Open-Meteo forecast (Cairns), not a live sensor.
How to Grow Sweet Corn in Tropical Australia
When to Plant
Year-round, dry season best.
- Soil
- Deep, fertile, well-drained soil enriched with compost and aged manure. Heavy feeder.
- pH Range
- 5.8-7.0
- Sunlight
- Full sun (minimum 8 hours). No shade tolerance.
- Spacing
- 30cm apart, 60cm between rows
- Watering
- Deep water 2-3 times weekly. CRITICAL: increase at tasselling/silk stage. Water stress causes bare cob patches.
Companion plants: Beans (Three Sisters), Pumpkin/Squash, Cucumber
Avoid planting near: Tomato (shared corn earworm)
Tropical Growing Tips for Sweet Corn
Recommended Varieties
- Honey and Cream
- Hawaiian Supersweet
- Early Chief
Key Challenges
- Fall armyworm severe
- Corn earworm year-round
- Rapid sugar loss in heat
Pro Tips
- Plant in blocks minimum 4x4 - non-negotiable
- Monitor whorl weekly for fall armyworm
- Harvest dawn, eat immediately
Harvesting Sweet Corn
When ready: Silks brown/dry. Cob full and firm through husk. Kernel exudes milky juice when pierced with thumbnail (milk stage).
How to harvest: Grasp cob, snap downward while twisting. Eat immediately. Sugar converts to starch within hours.
Worth growing?
A 2.4 m × 1.2 m bed fits 12 plants, about $32 worth at today’s Aldi, IGA and Woolworths prices, checked today.
That is roughly 3 kg at $10.59 a kilo.
Draw your sweet corn bed → No account needed.
Common Sweet Corn Pests in Tropical Zones
Organic prevention: Remove old plants. Crop rotation.
Where to next
Supermarket Price
Current average retail: $10.59/kg (12-month range: $6.98–$15.71)
Grow your own and save on grocery bills.
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Open the planting dashboard Join Garden BuddyCommon Questions About Sweet Corn
When do you plant sweet corn in Australia?
It depends on your climate zone, not the calendar month alone. Planting months by zone:
- Tropical (Cairns): Jan to Nov
- Subtropical (Brisbane): Jan to Mar, Jul to Dec
- Warm Temperate (Sydney): Jan, Sep to Dec
- Cool Temperate (Melbourne): Jan, Sep to Dec
- Cold / Highland (Canberra): Jan, Sep to Dec
- Arid / Semi-Arid (Alice Springs): Jan to Feb, Aug to Dec
- Mediterranean (Perth): Jan, Sep to Dec
Does sweet corn grow all year round in Cairns?
No. In the Tropical zone the planting months are Jan to Nov. Outside that window it either bolts, sulks or gets cut down by the weather.
What else is sweet corn called?
Sweet corn is the usual Australian name. Overseas seed packets and recipes call it corn, maize. Same plant, same growing advice.
Which zone am I in?
Type your postcode into the box under the heading and the page tells you, and links this crop in your own zone if it differs. Or look it up on the grow zone map. This page is the Tropical zone, Cairns is its reference city.