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When to plant winter squash in Washington

Washington spans USDA zones 6b–9a, so the right time to plant winter squash shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 8 in Port Townsend to June 6 in Cheney — below are local dates for 132 cities, each computed from its own frost dates.

In Seattlethe winter squash direct sow window (March 15–March 29) has passed for this year.
CityZoneLast frostFirst frostDirect sow
Seattle9aMarch 8November 23March 15 – March 29
Spokane7aApril 26October 15May 3 – May 17
Tacoma8bMarch 8November 14March 15 – March 29
Vancouver8bMarch 29November 9April 5 – April 19
Bellevue9aMarch 8November 23March 15 – March 29
Kent8bMarch 20November 10March 27 – April 10
Everett8bMarch 24November 2March 31 – April 14
Spokane Valley7aApril 26October 15May 3 – May 17

Winter Squash in Washington: FAQ

When can I plant winter squash in Washington?

Across Washington, the time to direct-sow winter squash spans roughly March 8 in Port Townsend to June 6 in Cheney, each following that city's local frost dates.

Does the winter squash planting date vary across Washington?

Yes. Washington publishes 132 cities with their own frost dates, so the right winter squash planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.

How long does winter squash take to grow in Washington?

Winter Squash takes about 85–110 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.

Planting reminders

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An email when it’s time to start seeds, transplant, and sow — timed to your frost dates. Double opt-in, one-click unsubscribe, no spam.

Winter Squash planting guide →All Washington cities →Washington planting calendar →
When to Plant Winter Squash in Washington — Frost-Based Dates by City — BlissGarden