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Can You Grow Leek in Colorado?

US · USDA Zone 5b · zones 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b

Grows well here

Leeks grow well here — cold-hardy and can be harvested into late autumn.

Plant zones

3a–9b

Colorado last frost

early April

Colorado first frost

late October

Days to harvest

100–150 days

When to plant Leeks in Colorado

Start indoors

Jan 12

Transplant

Apr 7

Harvest

Jul 16 – Sep 4

Dates are approximate, based on Colorado's average frost dates. Your exact yard may vary by microclimate.

About Leek

Leeks are cold-hardy slow-growing vegetables that can be harvested well into autumn and even winter.

Start indoors in late winter — leeks need a very long season. Transplant deeply to blanch stems. Harvest after first frosts — cold improves flavour. Very cold-hardy surviving to -10°C.

Full leek growing guide →

Gardening in Colorado

Colorado has a semi-arid mountain climate with intense sunshine and low humidity. Front Range cities like Denver are Zone 5-6; higher elevations are Zones 3-4.

See what grows well in Colorado →

Frequently asked questions

Can you grow Leek in Colorado?

Leeks grow well here — cold-hardy and can be harvested into late autumn.

What zone is Colorado?

Colorado spans USDA Zone 5b (3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b).

When do you plant Leeks in Colorado?

Plant Leeks around early April (start indoors Jan 12), harvest Jul 16 – Sep 4.