When to plant summer squash / zucchini in Washington
Common questions
When can I sow summer squash / zucchini outdoors in Washington?
Direct-sow around late April (Apr 30–May 21) in Washington, based on its local frost dates. Confidence 86%.
When will summer squash / zucchini be ready to harvest in Washington?
Expect to harvest from around mid June (Jun 14–Jun 29) in Washington, based on its local frost dates. Confidence 80%.
When should I start summer squash / zucchini seeds indoors in Washington?
Start seeds indoors around late March (Mar 24–Apr 14) in Washington, based on its local frost dates. Confidence 85%.
When can I transplant summer squash / zucchini outdoors in Washington?
Transplant outdoors around late April (Apr 30–May 21) in Washington, based on its local frost dates. Confidence 86%.
How long is the growing season in Washington?
Washington has roughly 234 frost-free days, which is enough time to grow summer squash / zucchini to maturity outdoors.
Sow summer squash / zucchini 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. Every date on this page is derived from that rule and Washington's frost dates.