When to plant watermelon in Oregon
Oregon spans USDA zones 6b–9b, so the right time to plant watermelon shifts by weeks across the state. The window to transplant seedlings outdoors runs from about February 18 in Aloha to June 16 in Redmond — below are local dates for 69 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Portland | 8b | February 25 | December 1 | March 4 – March 11 |
| Eugene | 8b | April 11 | October 23 | April 18 – April 25 |
| Salem | 8b | April 3 | November 1 | April 10 – April 17 |
| Gresham | 9a | March 16 | November 20 | March 23 – March 30 |
| Hillsboro | 8b | April 16 | October 23 | April 23 – April 30 |
| Bend | 6b | June 6 | September 20 | June 13 – June 20 |
| Beaverton | 9a | April 1 | November 6 | April 8 – April 15 |
| Medford | 8b | April 8 | October 29 | April 15 – April 22 |
Watermelon in Oregon: FAQ
When can I plant watermelon in Oregon?
Across Oregon, the time to transplant watermelon spans roughly February 18 in Aloha to June 16 in Redmond, each following that city's local frost dates.
Does the watermelon planting date vary across Oregon?
Yes. Oregon publishes 69 cities with their own frost dates, so the right watermelon 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 watermelon take to grow in Oregon?
Watermelon takes about 75–95 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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