When to plant sunflower in Oregon
Oregon spans USDA zones 6b–9b, so the right time to plant sunflower shifts by weeks across the state. The window to sow seed directly outdoors runs from about February 11 in Aloha to June 9 in Redmond — below are local dates for 69 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Portland | 8b | February 25 | December 1 | February 25 – March 18 |
| Eugene | 8b | April 11 | October 23 | April 11 – May 2 |
| Salem | 8b | April 3 | November 1 | April 3 – April 24 |
| Gresham | 9a | March 16 | November 20 | March 16 – April 6 |
| Hillsboro | 8b | April 16 | October 23 | April 16 – May 7 |
| Bend | 6b | June 6 | September 20 | June 6 – June 27 |
| Beaverton | 9a | April 1 | November 6 | April 1 – April 22 |
| Medford | 8b | April 8 | October 29 | April 8 – April 29 |
Sunflower in Oregon: FAQ
When can I plant sunflower in Oregon?
Across Oregon, the time to direct-sow sunflower spans roughly February 11 in Aloha to June 9 in Redmond, each following that city's local frost dates.
Does the sunflower planting date vary across Oregon?
Yes. Oregon publishes 69 cities with their own frost dates, so the right sunflower 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 sunflower take to grow in Oregon?
Sunflower takes about 70–100 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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