When to plant hyssop in Washington
Washington spans USDA zones 6b–9a, so the right time to plant hyssop shifts by weeks across the state. The window to transplant seedlings outdoors runs from about March 1 in Port Townsend to May 30 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 8 – March 22 |
| Spokane | 7a | April 26 | October 15 | April 26 – May 10 |
| Tacoma | 8b | March 8 | November 14 | March 8 – March 22 |
| Vancouver | 8b | March 29 | November 9 | March 29 – April 12 |
| Bellevue | 9a | March 8 | November 23 | March 8 – March 22 |
| Kent | 8b | March 20 | November 10 | March 20 – April 3 |
| Everett | 8b | March 24 | November 2 | March 24 – April 7 |
| Spokane Valley | 7a | April 26 | October 15 | April 26 – May 10 |
Hyssop in Washington: FAQ
When can I plant hyssop in Washington?
Across Washington, the time to transplant hyssop spans roughly March 1 in Port Townsend to May 30 in Cheney, each following that city's local frost dates.
Does the hyssop planting date vary across Washington?
Yes. Washington publishes 132 cities with their own frost dates, so the right hyssop planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
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