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Oregon frost dates
Across the 26Oregon weather stations below, the average last spring frost ranges from Feb 21 in North Bend to Jun 11 in Riley 10 Wsw. The statewide middle is about Apr 15 for the last spring frost and Oct 27 for the first fall frost. North Bend has the longest growing season, about 291 days. Hardiness zones in these places: 6a, 6b, 7a, 7b, 8b, 9a, 9b.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| North Bend | 9a | Feb 21 | Mar 25 | Dec 9 | 291 |
| Portland | 9a | Mar 13 | Apr 1 | Nov 19 | 251 |
| Aurora | 8b | Mar 16 | Apr 7 | Nov 14 | 243 |
| Portland Troutdale | 9a | Mar 16 | Apr 12 | Nov 20 | 249 |
| Roseburg | 8b | Mar 19 | Apr 13 | Nov 20 | 246 |
| Newport | 9b | Mar 21 | Apr 12 | Nov 27 | 251 |
| Astoria | 9a | Mar 26 | Apr 18 | Nov 11 | 230 |
| Salem Mcnary | 8b | Apr 3 | Apr 27 | Nov 1 | 212 |
| Medford Rogue Vly | 8b | Apr 8 | Apr 30 | Oct 29 | 204 |
| Scappoose Ind | 8b | Apr 10 | May 1 | Nov 2 | 206 |
| Corvallis 10 Ssw | 8b | Apr 11 | May 5 | Oct 30 | 202 |
| Eugene Mahlon Sweet | 8b | Apr 11 | May 9 | Oct 23 | 195 |
| Coos Bay 8 Sw | 9a | Apr 15 | May 3 | Oct 31 | 199 |
| Mcminnville | 8b | Apr 15 | May 6 | Oct 26 | 194 |
| Portland-Hillsboro | 8b | Apr 16 | May 3 | Oct 23 | 190 |
| Ontario | 7a | Apr 21 | May 8 | Oct 14 | 176 |
| Hermiston | 7b | Apr 26 | May 10 | Oct 10 | 167 |
| Pendleton | 7a | Apr 26 | May 10 | Oct 16 | 173 |
| John Day 35 Wnw | 7a | Apr 30 | May 14 | Oct 14 | 167 |
| Sexton Summit | 8b | May 16 | Jun 7 | Oct 30 | 167 |
| Baker | 6b | May 25 | Jun 16 | Sep 15 | 113 |
| Rome | 6b | May 26 | Jun 13 | Sep 21 | 118 |
| Klamath Falls | 6b | Jun 9 | Jun 26 | Sep 18 | 101 |
| Redmond Roberts | 6b | Jun 9 | Jun 26 | Sep 14 | 97 |
| Burns | 6a | Jun 11 | Jun 28 | Sep 6 | 87 |
| Riley 10 Wsw | 6a | Jun 11 | Jul 3 | Sep 11 | 92 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Oregon
Using the statewide middle dates (last frost Apr 15, first frost Oct 27). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Oregon |
|---|---|
| Tomatoes | Apr 22 – May 6 |
| Peas | Mar 4 – Mar 25; fall: Aug 4 – Aug 25 |
| Potatoes | Mar 18 – Apr 8 |
| Green beans | Apr 22 – May 6; fall: Aug 11 – Aug 25 |
| Garlic | Oct 27 – Nov 24 |
| Tulips | Oct 13 – Nov 24 |