Frost dates in Oregon
Across Oregon, the typical last spring frost is around Apr 14 and the first fall frost around Oct 28. Your own dates depend on where you are in the state; find your county below.
Most of the state's last spring frosts fall between Mar 9 and Jun 4, and its first fall frosts between Sep 18 and Dec 1.
These are the dates with a 50% chance of a 32°F frost on or after (spring) or on or before (fall), so plan tender crops a week or two after the spring date and keep row cover handy. For dates at your exact ZIP code, use the zone and frost date lookup; for what to plant when, see the planting guide by frost date.
Hardiness zones in Oregon: zone 5b, zone 6a, zone 6b, zone 7a, zone 7b, zone 8a, zone 8b, zone 9a, zone 9b
Frost dates by county in Oregon
| County | Last spring frost | First fall frost | Growing season |
|---|---|---|---|
| Baker | May 25 | Sep 24 | About 122 days |
| Benton | Apr 17 | Oct 30 | About 196 days |
| Clackamas | Mar 18 | Nov 18 | About 245 days |
| Clatsop | Apr 2 | Nov 12 | About 224 days |
| Columbia | Apr 18 | Nov 7 | About 203 days |
| Coos | Mar 21 | Nov 24 | About 248 days |
| Crook | Jun 2 | Sep 17 | About 107 days |
| Curry | Mar 16 | Dec 3 | About 262 days |
| Deschutes | Jun 7 | Sep 18 | About 103 days |
| Douglas | Mar 31 | Nov 6 | About 220 days |
| Gilliam | May 10 | Oct 21 | About 164 days |
| Grant | May 28 | Sep 18 | About 113 days |
| Harney | Jun 5 | Sep 18 | About 105 days |
| Hood River | May 13 | Oct 3 | About 143 days |
| Jackson | Apr 29 | Oct 17 | About 171 days |
| Jefferson | May 19 | Oct 4 | About 138 days |
| Josephine | May 1 | Oct 28 | About 180 days |
| Klamath | Jun 6 | Sep 20 | About 106 days |
| Lake | Jun 8 | Sep 15 | About 99 days |
| Lane | Apr 11 | Oct 25 | About 197 days |
| Lincoln | Mar 12 | Dec 10 | About 273 days |
| Linn | Apr 12 | Oct 28 | About 199 days |
| Malheur | May 8 | Oct 3 | About 148 days |
| Marion | Mar 29 | Nov 6 | About 222 days |
| Morrow | Apr 26 | Oct 19 | About 176 days |
| Multnomah | Mar 13 | Nov 22 | About 254 days |
| Polk | Apr 16 | Nov 1 | About 199 days |
| Sherman | May 15 | Oct 4 | About 142 days |
| Tillamook | Apr 22 | Oct 21 | About 182 days |
| Umatilla | Apr 26 | Oct 9 | About 166 days |
| Union | May 11 | Sep 26 | About 138 days |
| Wallowa | Jun 7 | Sep 9 | About 94 days |
| Wasco | May 12 | Oct 7 | About 148 days |
| Washington | Apr 1 | Nov 6 | About 219 days |
| Wheeler | Jun 3 | Sep 14 | About 103 days |
| Yamhill | Apr 5 | Nov 7 | About 216 days |
Source: NOAA NCEI U.S. Climate Normals 1991–2020, 50% probability of 32°F, from the weather station nearest each ZIP code; each county shows the middle value across its ZIP codes. Hills, valleys and cities can run a week or more earlier or later.