When to Plant Cucumber in Cairns, Tropical Guide

Sow March to September. Right now in September you can sow.

Planting window
Dry season (April-September) is optimal. Can grow year-round but wet season brings downy mildew and poor fruit set. In the dry tropics...
Days to harvest
55 days
Sunlight
Full sun (minimum 6 hours). In hot climates (tropics, arid), light afternoon shade reduces heat stress.
Water needs
Heavy water demands. Deep, consistent watering at base is critical. Irregular watering...
Spacing
50cm apart, 120cm between rows
Soil pH
6.0-7.0
Shop price
$9.56/kg average

Published · Last reviewed · By GardenBuddy.au
Growing advice is reviewed by hand. Planting dates, current conditions and prices on this page update daily.

This Cucumber 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.

Cucumber

Photo: Wikimedia Commons

Cucumbers are warm-season cucurbits that produce prolifically in Australian summers. Three main types are grown: Lebanese (short, smooth, seedless), Continental (long, thin-skinned) and pickling/gherkin varieties. Monoecious plants with separate male and female flowers on the same vine. Cross-pollinate readily with other cucumber varieties but NOT with melons, pumpkins or zucchini.

Planting Calendar for Tropical

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
- - S S/T/D S/T/D S/T/D S/T/D T/D T - - -

S = Seed Tray   T = Transplant   D = Direct Sow

Want a nudge when it is Cucumber sowing time in Cairns?

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Current Growing Conditions

Soil temperature: 21.3°C (optimal range: 18–35°C) ✓ Ready to plant

Modelled from Open-Meteo forecast (Cairns), not a live sensor.

How to Grow Cucumber in Tropical Australia

When to Plant

Dry season (April-September) is optimal. Can grow year-round but wet season brings downy mildew and poor fruit set. In the dry tropics, year-round production is feasible.

Soil
Rich, well-drained soil with generous compost and well-rotted manure. Cucumbers are heavy feeders and need fertile, moisture-retentive soil.
pH Range
6.0-7.0
Sunlight
Full sun (minimum 6 hours). In hot climates (tropics, arid), light afternoon shade reduces heat stress.
Spacing
50cm apart, 120cm between rows
Watering
Heavy water demands. Deep, consistent watering at base is critical. Irregular watering causes bitter, misshapen fruit. Drip irrigation ideal. Water in morning to allow foliage to dry (reduces mildew).

Companion plants: Corn, Beans, Peas, Sunflower, Radish, Dill

Avoid planting near: Potato, Aromatic herbs (sage, mint), Melon (same family rotation issues)

Tropical Growing Tips for Cucumber

Recommended Varieties

  • Lebanese (most reliable)
  • Burpless
  • Crystal Apple
  • Gherkin (pickling)

Key Challenges

  • Downy mildew in wet season
  • Pumpkin beetle year-round
  • Heat stress above 38C

Pro Tips

  • Dry season crops are far more productive and disease-free
  • Trellis growing improves air circulation and reduces disease
  • 30% shade cloth in the hottest months reduces heat stress

Harvesting Cucumber

When ready: Lebanese: 12-15cm, firm, dark green. Continental: 30-40cm, firm. Gherkins: 5-8cm for pickling. All types: harvest BEFORE seeds inside become large and hard. Overripe cucumbers are seedy, bitter and watery.

How to harvest: Cut with scissors or secateurs leaving short stem. Do not pull (damages vine). Harvest early morning when fruit is cool and firm.

Common Cucumber Pests in Tropical Zones

Powdery Mildew, risk: MODERATE (score: 46/100)

Organic prevention (Powdery Mildew): Good air circulation (trellis growing helps). Avoid overcrowding. Choose resistant varieties (Socrates, Diva). Succession planting means younger, healthier plants replace mildewed ones.

View all pest alerts →

Where to next

What cucumber costs in the shops right now, retailer by retailer, updated daily.

Also worth sowing in the tropical zone this September: Lemongrass, Ginger, Basil and Okra.

The pest most likely to find your cucumber: Botrytis / Grey Mould.

Supermarket Price

Current average retail: $9.56/kg (12-month range: $4.79–$15.80)

Grow your own and save on grocery bills.

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Common Questions About Cucumber

When do you plant cucumber in Australia?

It depends on your climate zone, not the calendar month alone. Planting months by zone:

Does cucumber grow all year round in Cairns?

No. In the Tropical zone the planting months are Mar to Sep. Outside that window it either bolts, sulks or gets cut down by the weather.

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.