When to plant bitter melon in Washington
Washington spans USDA zones 6b–9a, so the right time to plant bitter melon shifts by weeks across the state. The window to transplant seedlings outdoors runs from about March 15 in Port Townsend to June 13 in Cheney — below are local dates for 132 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Seattle | 9a | March 8 | November 23 | March 22 – March 29 |
| Spokane | 7a | April 26 | October 15 | May 10 – May 17 |
| Tacoma | 8b | March 8 | November 14 | March 22 – March 29 |
| Vancouver | 8b | March 29 | November 9 | April 12 – April 19 |
| Bellevue | 9a | March 8 | November 23 | March 22 – March 29 |
| Kent | 8b | March 20 | November 10 | April 3 – April 10 |
| Everett | 8b | March 24 | November 2 | April 7 – April 14 |
| Spokane Valley | 7a | April 26 | October 15 | May 10 – May 17 |
Bitter Melon in Washington: FAQ
When can I plant bitter melon in Washington?
Across Washington, the time to transplant bitter melon spans roughly March 15 in Port Townsend to June 13 in Cheney, each following that city's local frost dates.
Does the bitter melon planting date vary across Washington?
Yes. Washington publishes 132 cities with their own frost dates, so the right bitter melon 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 bitter melon take to grow in Washington?
Bitter Melon takes about 55–70 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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