Oregon frost dates
Across 171 weather stations in Oregon, the median last spring frost runs from Jan 31 in Brookings to Jun 11 in Squaw Butte-Northern Great Bas, and the first fall frost from Sep 5 to Dec 27.
Oregon at a glance
- Weather stations
- 171
- Earliest last frost
- Jan 31 Brookings
- Latest last frost
- Jun 11 Squaw Butte-Northern Great Bas
- Longest season
- 349 days Brookings
- Typical season
- about 183 frost-free days
- Hardiness zones
- Zones 6a to 9b
Frost dates by weather station
| Weather station | Last spring frost | First fall frost | Frost-free days | Zone |
|---|---|---|---|---|
| Alkali Lake | Jun 10 | Sep 14 | 94 | 6b |
| Alsea Fh (fall Creek) | Apr 13 | Nov 3 | 202 | 9a |
| Antelope | May 22 | Oct 3 | 131 | 7a |
| Arlington | Apr 6 | Oct 21 | 196 | 7b |
| Ashland | May 6 | Oct 8 | 154 | 8a |
| Astoria Regional Airport | Mar 26 | Nov 11 | 232 | 9a |
| Aurora State Airport | Mar 16 | Nov 14 | 242 | 8b |
| Baker City Municipal Airport | May 25 | Sep 15 | 111 | 6b |
| Bandon | Mar 9 | Nov 27 | 260 | 9b |
| Barnes Station | Jun 2 | Sep 17 | 104 | 6a |
| Beaverton | Apr 1 | Nov 6 | 222 | 9a |
| Belknap Springs | May 5 | Oct 12 | 159 | 8b |
| Bend | Jun 6 | Sep 20 | 105 | 6b |
| Bly | Jun 8 | Sep 17 | 101 | 6b |
| Boardman | Apr 14 | Oct 21 | 188 | 7b |
| Bonneville Dam | Mar 14 | Nov 27 | 257 | 9a |
| Brookings | Jan 31 | Dec 27 | 349 | 9b |
| Brookings 2 mi SE | Jan 31 | Dec 27 | 334 | 9b |
| Burns Municipal Airport | Jun 11 | Sep 6 | 85 | 6a |
| Cascade Locks | Mar 24 | Nov 20 | 242 | 8a |
| Cascadia | Apr 29 | Oct 13 | 167 | 8b |
| Cave Junction | May 1 | Oct 12 | 161 | 8b |
| Clatskanie | Apr 24 | Oct 24 | 184 | 8b |
| Cloverdale | Mar 17 | Nov 22 | 251 | 9b |
| Condon | May 10 | Oct 7 | 148 | 7a |
| Coos Bay | Apr 15 | Oct 31 | 199 | 9a |
| Coquille City | Mar 28 | Nov 6 | 225 | 9a |
| Corvallis | Apr 11 | Oct 30 | 203 | 8b |
| Corvallis State University | Apr 17 | Oct 28 | 194 | 8b |
| Corvallis Water Bureau | May 15 | Oct 8 | 145 | 8b |
| Cottage Grove | Apr 24 | Oct 25 | 183 | 8b |
| Cottage Grove Dam | Apr 12 | Nov 1 | 205 | 8b |
| Cougar Dam | Mar 2 | Nov 30 | 274 | 8b |
| Dallas | Apr 16 | Nov 1 | 199 | 8b |
| Dayville | May 4 | Oct 6 | 155 | 7a |
| Detroit Dam | Mar 9 | Dec 3 | 270 | 8b |
| Dorena | Apr 16 | Oct 28 | 194 | 8b |
| Drain | Apr 16 | Oct 25 | 193 | 8b |
| Drewsey | Jun 5 | Sep 5 | 91 | 6a |
| Dufur | May 12 | Oct 7 | 148 | 7b |
| Elgin | May 24 | Sep 18 | 114 | 6b |
| Elkton 1 mi SW | Apr 11 | Nov 6 | 209 | 9a |
| Elkton 3 mi SW | Mar 21 | Nov 12 | 240 | 9a |
| Enterprise | Jun 8 | Sep 5 | 84 | 7a |
| Estacada | Mar 27 | Nov 14 | 230 | 8b |
| Eugene Mahlon Sweet Airport | Apr 11 | Oct 23 | 196 | 8b |
| Falls City | Apr 18 | Nov 7 | 202 | 8b |
| Fern Ridge-Veneta | Apr 18 | Oct 25 | 189 | 8b |
| Fields | May 10 | Oct 7 | 145 | 6b |
| Florence | Apr 10 | Nov 15 | 220 | 9a |
| Forest Grove | Apr 16 | Oct 26 | 192 | 8b |
| Fort Clatsop National Memorial | Mar 30 | Nov 18 | 233 | 9a |
| Fossil | Jun 3 | Sep 14 | 98 | 7a |
| Foster Dam | Apr 12 | Oct 28 | 197 | 8b |
| Gerber Dam | May 31 | Sep 21 | 114 | 6b |
| Gold Beach Ranger Station | Feb 16 | Dec 16 | 314 | 9b |
| Government Camp | May 27 | Oct 9 | 134 | 7a |
| Grants Pass | Apr 8 | Oct 28 | 201 | 8b |
| Halfway | May 15 | Sep 24 | 130 | 6b |
| Headworks Portland Water B | Mar 27 | Nov 18 | 239 | 8b |
| Heppner | Apr 26 | Oct 19 | 174 | 7a |
| Hermiston | Apr 27 | Oct 7 | 163 | 7b |
| Hermiston Municipal Airport | Apr 26 | Oct 10 | 167 | 7b |
| Honeyman State Park | Mar 28 | Nov 22 | 237 | 9a |
| Hood River Experiment Station | Apr 20 | Oct 13 | 177 | 8a |
| Howard Prairie Dam | Jun 8 | Sep 24 | 108 | 8a |
| Huntington | Apr 23 | Oct 13 | 172 | 7a |
| Idleyld Park | Apr 27 | Oct 19 | 176 | 8b |
| Illahe | Mar 30 | Nov 17 | 233 | 9a |
| John Day | May 28 | Sep 18 | 113 | 6b |
| John Day 35 mi WNW | Apr 30 | Oct 14 | 167 | 7a |
| Joseph | May 24 | Oct 1 | 126 | 6a |
| Keno | Jun 5 | Sep 20 | 107 | 6b |
| Kent | May 15 | Oct 11 | 147 | 7a |
| Klamath Falls International Airport | Jun 9 | Sep 18 | 99 | 6b |
| La Grande | May 6 | Oct 1 | 146 | 6b |
| Lacomb | Apr 26 | Oct 24 | 184 | 8b |
| Lakeview | Jun 4 | Sep 17 | 102 | 6b |
| Langlois | Mar 16 | Nov 29 | 258 | 9a |
| Laurel Mountain | May 20 | Oct 23 | 157 | 8b |
| Leaburg | Apr 3 | Nov 11 | 220 | 8b |
| Lebanon | Mar 14 | Nov 18 | 248 | 8b |
| Lemolo Lake | Jun 1 | Sep 23 | 115 | 8b |
| Long Creek | Jun 5 | Sep 14 | 99 | 6b |
| Lookout Point Dam | Mar 7 | Nov 27 | 263 | 9a |
| Lost Creek Dam | Apr 29 | Oct 17 | 171 | 8a |
| Madras | May 19 | Oct 4 | 136 | 7a |
| Malheur Branch Experiment Station | Apr 23 | Oct 13 | 173 | 7a |
| Malheur Refuge Headquarters | May 29 | Sep 18 | 113 | 6a |
| Mapleton | Feb 15 | Dec 9 | 306 | 9a |
| Marion Forks Fish Hatchery | May 15 | Sep 30 | 134 | 7b |
| McDermitt | Jun 4 | Sep 26 | 113 | 7a |
| McKenzie River Ranger Station | May 1 | Oct 10 | 159 | 7b |
| McMinnville | Apr 5 | Nov 7 | 216 | 8b |
| McMinnville Municipal Airport | Apr 15 | Oct 26 | 195 | 8b |
| McNary Dam | Mar 30 | Nov 4 | 217 | 7b |
| Medford Rogue Valley Airport | Apr 8 | Oct 29 | 204 | 8b |
| Milton Freewater | Mar 25 | Oct 29 | 218 | 7a |
| Mitchell | May 22 | Oct 4 | 135 | 7a |
| Molalla | Mar 16 | Nov 19 | 247 | 8b |
| Monument | May 9 | Sep 27 | 139 | 7a |
| Moro | May 12 | Oct 4 | 143 | 7a |
| Nature Park-Beaverton | Feb 11 | Dec 5 | 303 | 9a |
| Newport | Mar 21 | Nov 27 | 252 | 9b |
| Newport 1 mi SE | Feb 19 | Dec 16 | 306 | 9b |
| Newport 3 mi N | Mar 12 | Dec 10 | 271 | 9b |
| North Bend Regional Airport | Feb 21 | Dec 9 | 294 | 9a |
| North Willamette Experiment Station | Mar 18 | Nov 13 | 243 | 8b |
| Nyssa | Apr 18 | Oct 18 | 182 | 7a |
| O O Ranch | Jun 11 | Sep 6 | 88 | 6a |
| Oakridge Fish Hatchery | Apr 24 | Oct 24 | 183 | 8b |
| Ontario Ksrv | Apr 22 | Oct 9 | 168 | 7a |
| Ontario Municipal Airport | Apr 21 | Oct 14 | 176 | 7a |
| Oregon City | Mar 18 | Nov 18 | 244 | 9a |
| Otis | Apr 4 | Nov 16 | 227 | 9a |
| Owyhee Dam | May 7 | Oct 5 | 150 | 7a |
| Paisley | Jun 6 | Sep 14 | 98 | 6b |
| Parkdale | May 13 | Oct 3 | 142 | 7b |
| Pelton Dam | May 5 | Oct 7 | 154 | 7a |
| Pendleton | Apr 26 | Oct 16 | 174 | 7a |
| Pendleton Branch Experiment Station | May 12 | Sep 27 | 135 | 7a |
| Pendleton Downtown | Apr 22 | Oct 9 | 170 | 7a |
| Pilot Rock | May 7 | Oct 4 | 147 | 6b |
| Port Orford | Feb 17 | Dec 3 | 292 | 9b |
| Portland | Mar 13 | Nov 22 | 251 | 9a |
| Portland International Airport | Mar 13 | Nov 19 | 247 | 9a |
| Portland KGW-TV | Feb 25 | Dec 1 | 280 | 8b |
| Portland Troutdale Airport | Mar 16 | Nov 20 | 250 | 9a |
| Portland-Hillsboro Airport | Apr 16 | Oct 23 | 191 | 8b |
| Powers | Mar 21 | Nov 14 | 241 | 9a |
| Prineville | Jun 1 | Sep 22 | 113 | 6b |
| Prospect | May 19 | Oct 3 | 136 | 8a |
| Redmond Roberts Field | Jun 9 | Sep 14 | 98 | 6b |
| Rex | Mar 21 | Nov 22 | 241 | 8b |
| Richland | May 10 | Oct 1 | 141 | 6b |
| Riddle | Mar 31 | Nov 6 | 221 | 8b |
| Riley | Jun 11 | Sep 11 | 87 | 6a |
| Riverside | Jun 7 | Sep 6 | 89 | 6a |
| Rockville | May 29 | Sep 14 | 108 | 7a |
| Rome | Jun 11 | Sep 10 | 88 | 6b |
| Rome St. Airport | May 26 | Sep 21 | 117 | 6b |
| Roseburg Kqen | Mar 23 | Nov 18 | 237 | 8b |
| Roseburg Regional Airport | Mar 19 | Nov 20 | 245 | 8b |
| Ruch | May 4 | Oct 13 | 160 | 8a |
| Saint Helens Rfd | Apr 18 | Nov 7 | 201 | 8b |
| Salem McNary Field | Apr 3 | Nov 1 | 212 | 8b |
| Scappoose Ind Airport | Apr 10 | Nov 2 | 209 | 8b |
| Scotts Mills | Apr 27 | Nov 4 | 190 | 8b |
| Seaside | Apr 2 | Nov 12 | 223 | 9a |
| Sexton Summit | May 16 | Oct 30 | 164 | 8b |
| Sheaville | May 22 | Sep 28 | 126 | 7a |
| Silver Creek Falls | Apr 30 | Oct 22 | 174 | 8b |
| Silverton | Mar 28 | Nov 10 | 227 | 8b |
| Squaw Butte-Northern Great Bas | Jun 11 | Sep 28 | 107 | 6a |
| Stayton | Mar 29 | Nov 6 | 222 | 8b |
| Summer Lake | Jun 8 | Sep 15 | 96 | 6b |
| The Dalles | Apr 14 | Oct 23 | 191 | 8a |
| Three Lynx | Apr 5 | Nov 8 | 217 | 8a |
| Tillamook | Apr 22 | Oct 21 | 183 | 9a |
| Tillamook 6 mi SE | Apr 5 | Nov 4 | 219 | 9a |
| Toketee Falls | Apr 29 | Oct 18 | 171 | 8b |
| Troutdale | Mar 26 | Nov 17 | 237 | 9a |
| Union | May 11 | Sep 26 | 136 | 6b |
| Vale | May 8 | Sep 29 | 140 | 7a |
| Vernonia | May 8 | Oct 1 | 144 | 8a |
| Wallowa | Jun 7 | Sep 9 | 91 | 6b |
| Westfall | May 7 | Oct 3 | 147 | 6a |
| Wickiup Dam | Jun 7 | Sep 18 | 100 | 6b |
| Winchester | Mar 31 | Nov 5 | 215 | 8b |
| Winchester Bay Coast Grd | Mar 25 | Nov 24 | 249 | 9a |
| Yachats | Feb 19 | Dec 11 | 303 | 9a |
Median dates from NOAA 1991–2020 climate normals. How to read them.