blissgarden.

When to plant butternut squash in Washington

Washington spans USDA zones 6b–9a, so the right time to plant butternut 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 butternut 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

Butternut Squash in Washington: FAQ

When can I plant butternut squash in Washington?

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

Does the butternut squash planting date vary across Washington?

Yes. Washington publishes 132 cities with their own frost dates, so the right butternut 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 butternut squash take to grow in Washington?

Butternut Squash takes about 90–110 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.

Planting reminders

Never miss a window in your area

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.

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