Oregon planting zones & frost dates
The 8 Oregon cities on this site fall in zones 6b, 8b, 9a. Last spring frost dates range from Mar 6 in Portland to Jun 14 in Bend.
| City | Zone | Last frost | First frost | Population |
|---|---|---|---|---|
| Portland | 9a | Mar 6 | Nov 22 | 635,749 |
| Salem | 8b | Apr 13 | Oct 26 | 180,406 |
| Eugene | 8b | Apr 25 | Oct 15 | 178,786 |
| Gresham | 9a | Mar 27 | Nov 9 | 111,507 |
| Hillsboro | 8b | Apr 25 | Oct 14 | 110,337 |
| Bend | 6b | Jun 14 | Sep 12 | 106,926 |
| Beaverton | 9a | Apr 11 | Oct 29 | 98,302 |
| Medford | 8b | Apr 18 | Oct 23 | 86,301 |
Frost dates are 30%-risk dates from the nearest suitable NOAA station. Population: Census Vintage 2024 estimates.