When to plant sweet potato in Oregon
Oregon spans USDA zones 6b–9b, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about March 4 in Aloha to June 30 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 18 – April 1 |
| Eugene | 8b | April 11 | October 23 | May 2 – May 16 |
| Salem | 8b | April 3 | November 1 | April 24 – May 8 |
| Gresham | 9a | March 16 | November 20 | April 6 – April 20 |
| Hillsboro | 8b | April 16 | October 23 | May 7 – May 21 |
| Bend | 6b | June 6 | September 20 | June 27 – July 11 |
| Beaverton | 9a | April 1 | November 6 | April 22 – May 6 |
| Medford | 8b | April 8 | October 29 | April 29 – May 13 |
Sweet Potato in Oregon: FAQ
When can I plant sweet potato in Oregon?
Across Oregon, the time to transplant sweet potato spans roughly March 4 in Aloha to June 30 in Redmond, each following that city's local frost dates.
Does the sweet potato planting date vary across Oregon?
Yes. Oregon publishes 69 cities with their own frost dates, so the right sweet potato 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 sweet potato take to grow in Oregon?
Sweet Potato takes about 90–120 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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