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Can You Grow Winter Squash in Alberta?

Canada · Canadian Zone 4 · zones 2, 3, 4, 5

Grows well here

Winter squash grows well here with warm summers — it needs heat to mature and set fruit.

Plant zones

3a–10b

Alberta last frost

early May

Alberta first frost

early October

Days to harvest

90–120 days

When to plant Winter Squashes in Alberta

Start indoors

Apr 3

Transplant

May 1

Harvest

Jul 30 – Aug 29

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

About Winter Squash

Winter squash (butternut, acorn, spaghetti) are the long-storing hard-skinned squash you plant in spring and harvest in fall. Vigorous, sprawling, and highly productive.

Direct sow or start indoors 4 weeks before last frost; transplant after frost. Give vines room (6-8 ft) or a trellis. Harvest when skin is hard and you can't dent it with a fingernail. Cure in a warm place for 1-2 weeks for long storage.

Full winter squash growing guide →

Gardening in Alberta

Alberta has a dry continental climate with cold winters and warm summers. Calgary and Edmonton are Zone 4-5. Intense sunshine compensates for the short season. Chinook winds bring warm spells in winter.