When to plant Lettuce in Cool Australia

Cool zone — applies to Hobart, Canberra, Ballarat, Orange, Armidale and similar areas. Growing elsewhere? Temperate · Subtropical · Tropical · Arid.

Lettuce sows direct almost year-round in the cool zone — August through May — pausing only for the depths of winter, when June and July soil is too cold for reliable germination. Seed sprouts in six to twelve days sown a scant 5 mm deep, and heads mature in 60–90 days, though loose-leaf types can be picked well before that. Being hardy, lettuce shrugs off the frosts that end the tomato season, making it the backbone of the autumn and spring garden in Hobart and Ballarat. Sow a short row every three weeks rather than one long row once.

Sowing calendar — cool zone

Green months are your sowing window: August to May.

Growing notes

Lettuce is hardy, and frost isn't what limits it in the cool zone — winter cold is. Growth all but stops in the depths of a Ballarat or Hobart winter, which is why the sowing window pauses over June and July: seed sown then sits sulking in cold soil rather than germinating reliably. Everything either side works. Autumn sowings from March to May establish before the cold and give slow, steady winter picking; August sowings kick off the spring flush; summer sowings keep the salad bowl full if you manage the heat.

Heat is the real enemy. Even cool-zone summers throw hot spells, and lettuce responds by bolting — the head elongates and the leaves turn bitter, which is the most common failure with this crop. Counter it by giving summer sowings afternoon shade, keeping water consistent, and above all sowing little and often: a short row every three weeks means something is always at its peak and nothing is left standing long enough to bolt. Lettuce seed also goes dormant in hot soil, so summer sowings germinate best made in the cool of evening and kept shaded.

Sow just 5 mm deep — buried seed fails — and thin hearting types to 20–30 cm. Watch for slugs, which can level a row of seedlings overnight in damp weather.

Lettuce at a glance

Companion planting

Grows well with

Peas: Peas fix nitrogen for lettuce; provide light shade in summer

Carrot: Carrots loosen soil; lettuce shades soil keeping it moist

Radish: Classic pairing — radish harvested before lettuce needs space

Common questions

Can I grow lettuce through winter in Hobart?

You can harvest through winter, but sow by May — established plants keep growing slowly through the cold, while seed sown in June or July germinates poorly in cold soil. The sowing window resumes in August.

Why is my lettuce bitter?

Bitterness means the plant has started bolting, usually triggered by heat or water stress. Pick earlier, water consistently, give summer crops afternoon shade, and sow small amounts every few weeks so nothing sits too long.

When should I sow lettuce in a cool climate?

From August right through to May — nearly year-round. Seed germinates in six to twelve days, and sowing a short row every three weeks gives a continuous supply instead of a glut.

Why won't my lettuce seed germinate in summer?

Lettuce seed goes dormant in hot soil. Sow in the evening when the ground is cooler, keep the seedbed shaded and moist, and germination returns to its normal six to twelve days.

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