Lettuce · Lanzhou, Gansu, China

When to plant lettuce in Lanzhou

Main outdoor window

9-23 Apr

The window this page is built around.

Timed from last spring frost

30 April

In Lanzhou, on your chosen risk.

Ready to pick

24 May - 8 Jun

If you plant at the start of the window.

The average last frost. Half of all years are later than this.

Cautious Balanced Bold

Step by step in Lanzhou

Each window is a range, not a single day. Earlier in the range buys you a longer season; later in it buys you a safer one.

Start indoors

19 Mar - 2 Apr

Six weeks before your last frost, under cover or on a windowsill.

Sow for autumn

12 Jul - 2 Aug

Counting back 74 days from your first frost so the crop matures in time.

Sow direct

9-23 Apr

Three weeks before your last frost.

Plant out

16-30 Apr

Two weeks before your last frost.

Harvest

24 May - 8 Jun

Sow in succession. A single sowing gives you a single glut. Sow a short row every 10 days through the window above and you get a steady supply instead.

Frost tolerance

Half-hardy

Damaged below

-3°C (26.6°F)

Days to maturity

45–60

Min soil temp

4.5°C (40.1°F)

Spacing

25 cm

Sowing depth

6 mm (0.2 in)

Sun

Partial

Lettuce through the year

Against the frost risk in Lanzhou

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Lettuce

Frost risk Start indoors Autumn sowing Sow direct Plant out Harvest Today

Why these dates

Sow every ten days from six weeks before last frost. Pause through midsummer, then resume for an autumn crop - late sowings are often the best of the year.

Tolerates -3C and a light frost actually sweetens the leaf. Seed germinates poorly above 25C, which is the more common problem.

Seed packets and extension guides express timing as weeks either side of the last spring frost, because that is the only reference point that travels. Lettuce are timed from 6 weeks before that frost for an indoor start, with planting out 2 weeks before it, and this page simply resolves those offsets against the frost date computed for Lanzhou.

The median frost-free season here is 168 days, against 45 to 60 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.

See every crop timed for Lanzhou →

Nearby

Lettuce in places close by

Baiyin 62 km Linxia Chengguanzhen 76 km Dingxi 89 km Nianbo 136 km Xining 197 km Zhongwei 202 km

Also in Lanzhou

Other vegetables to time

Tomatoes tender Potatoes half hardy Courgettes tender Sweet peppers tender Carrots hardy Cucumbers tender Green beans tender Peas hardy Garlic very hardy Chilli peppers tender Sweetcorn tender

Growing lettuce in Lanzhou

When should I plant lettuce in Lanzhou?

Aim for 9-23 Apr in an average year. If you would rather not gamble on the weather, wait until 21 Apr - 5 May - by then frost has finished in nine years out of ten.

When will lettuce be ready to harvest in Lanzhou?

Expect to start picking around 24 May - 8 Jun, based on 45 to 60 days to maturity from the planting date calculated for this location.

How much frost will lettuce tolerate?

Tolerates -3C and a light frost actually sweetens the leaf. Seed germinates poorly above 25C, which is the more common problem.