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Oregon frost dates

Across 172 NOAA climate stations in Oregon, the median last spring frost (32°F) ranges from Jan 31 at Brookings to Jun 11 at Squaw Butte-Northern Great Bas; the typical station sees its last frost around Apr 22 and its first fall frost around Oct 22.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

StationElevationLast frost (median)Last frost (10% risk)First frost (median)First frost (10% risk)Growing season
Alkali Lake4,332 ftJun 10Jun 27Sep 14Aug 3194 days
Alsea Fh (Fall Creek)230 ftApr 13May 3Nov 3Oct 9202 days
Antelope 6 Ssw3,030 ftMay 22Jun 10Oct 3Sep 16131 days
Arlington277 ftApr 6Apr 28Oct 21Oct 6196 days
Ashland1,729 ftMay 6May 27Oct 8Sep 21154 days
Astoria Rgnl AP9 ftMar 26Apr 18Nov 11Oct 22232 days
Aurora State AP196 ftMar 16Apr 7Nov 14Oct 27242 days
Baker City Muni AP3,361 ftMay 25Jun 16Sep 15Sep 2111 days
Bandon 2 Nne23 ftMar 9Apr 7Nov 27Nov 1260 days
Barnes Stn3,970 ftJun 2Jun 25Sep 17Aug 30104 days
Beaverton 2 Ssw270 ftApr 1Apr 26Nov 6Oct 19222 days
Belknap Springs 8 N2,152 ftMay 5May 29Oct 12Sep 25159 days
Bend3,660 ftJun 6Jun 22Sep 20Sep 3105 days
Bly 4 Se4,560 ftJun 8Jun 23Sep 17Sep 1101 days
Boardman280 ftApr 14May 2Oct 21Oct 5188 days
Bonneville Dam62 ftMar 14Apr 4Nov 27Nov 8257 days
Brookings82 ftJan 31Mar 21Dec 27Nov 26349 days
Brookings 2 Se50 ftJan 31Mar 20Dec 27Nov 24334 days
Burns Muni AP4,140 ftJun 11Jun 28Sep 6Aug 2185 days
Cascade Locks142 ftMar 24Apr 16Nov 20Nov 1242 days
Cascadia960 ftApr 29May 17Oct 13Sep 22167 days
Cave Junction 1 Wnw1,377 ftMay 1May 23Oct 12Sep 23161 days
Clatskanie22 ftApr 24May 9Oct 24Oct 5184 days
Cloverdale12 ftMar 17Apr 15Nov 22Oct 26251 days
Condon2,881 ftMay 10May 27Oct 7Sep 21148 days
Coos Bay 8 Sw12 ftApr 15May 3Oct 31Oct 8199 days
Coquille City23 ftMar 28Apr 27Nov 6Oct 17225 days
Corvallis 10 Ssw312 ftApr 11May 5Oct 30Oct 8203 days
Corvallis State Univ225 ftApr 17May 8Oct 28Oct 5194 days
Corvallis Water Bureau592 ftMay 15Jun 2Oct 8Sep 24145 days
Cottage Grove 2E595 ftApr 24May 10Oct 25Sep 30183 days
Cottage Grove Dam831 ftApr 12May 4Nov 1Oct 16205 days
Cougar Dam1,260 ftMar 2Mar 27Nov 30Nov 3274 days
Dallas 2 Ne290 ftApr 16May 5Nov 1Oct 13199 days
Dayville 8 Nw2,260 ftMay 4May 23Oct 6Sep 21155 days
Detroit Dam1,220 ftMar 9Apr 8Dec 3Nov 8270 days
Dorena820 ftApr 16May 11Oct 28Oct 4194 days
Drain292 ftApr 16May 8Oct 25Oct 2193 days
Drewsey3,515 ftJun 5Jun 26Sep 5Aug 2091 days
Dufur1,330 ftMay 12May 31Oct 7Sep 22148 days
Elgin2,697 ftMay 24Jun 21Sep 18Sep 1114 days
Elkton 1SW125 ftApr 11May 10Nov 6Oct 17209 days
Elkton 3 Sw120 ftMar 21Apr 14Nov 12Oct 14240 days
Enterprise 20 Nne3,280 ftJun 8Jul 8Sep 5Aug 1684 days
Estacada 2 Se514 ftMar 27Apr 23Nov 14Oct 23230 days
Eugene Mahlon Sweet AP353 ftApr 11May 9Oct 23Oct 6196 days
Falls City 2 Ssw690 ftApr 18May 6Nov 7Oct 21202 days
Fern Ridge-Veneta485 ftApr 18May 5Oct 25Oct 6189 days
Fields4,227 ftMay 10Jun 3Oct 7Sep 21145 days
Florence #275 ftApr 10May 5Nov 15Oct 23220 days
Forest Grove180 ftApr 16May 5Oct 26Oct 6192 days
Fossil2,650 ftJun 3Jul 3Sep 14Aug 2598 days
Foster Dam550 ftApr 12May 5Oct 28Oct 5197 days
Ft Clatsop Natl Mem42 ftMar 30Apr 28Nov 18Oct 27233 days
Gerber Dam4,870 ftMay 31Jun 17Sep 21Sep 6114 days
Gold Beach Rs50 ftFeb 16Mar 25Dec 16Nov 23314 days
Government Camp3,980 ftMay 27Jun 14Oct 9Sep 18134 days
Grants Pass932 ftApr 8May 1Oct 28Oct 8201 days
Halfway2,653 ftMay 15Jun 2Sep 24Sep 9130 days
Headworks Portland Wtr B748 ftMar 27Apr 20Nov 18Oct 26239 days
Heppner1,885 ftApr 26May 11Oct 19Oct 3174 days
Hermiston 2 Nw460 ftApr 27May 11Oct 7Sep 25163 days
Hermiston Muni AP641 ftApr 26May 10Oct 10Sep 25167 days
Honeyman Sp115 ftMar 28Apr 21Nov 22Oct 28237 days
Hood Rvr Exp Stn500 ftApr 20May 9Oct 13Sep 30177 days
Howard Prairie Dam4,567 ftJun 8Jun 25Sep 24Sep 6108 days
Huntington2,110 ftApr 23May 7Oct 13Oct 1172 days
Idleyld Park 4 Ne1,080 ftApr 27May 15Oct 19Sep 26176 days
Illahe348 ftMar 30May 2Nov 17Oct 20233 days
John Day3,063 ftMay 28Jun 15Sep 18Sep 2113 days
John Day 35 Wnw2,245 ftApr 30May 14Oct 14Oct 1167 days
Joseph4,184 ftMay 24Jul 6Oct 1Sep 10126 days
Keno4,128 ftJun 5Jun 22Sep 20Sep 6107 days
Kent2,710 ftMay 15Jun 6Oct 11Sep 27147 days
Klamath Falls Intl AP4,084 ftJun 9Jun 26Sep 18Sep 499 days
La Grande2,755 ftMay 6May 26Oct 1Sep 17146 days
Lacomb 3 Nne520 ftApr 26May 11Oct 24Oct 5184 days
Lakeview 2 Nnw4,890 ftJun 4Jun 22Sep 17Aug 27102 days
Langlois #290 ftMar 16Apr 15Nov 29Nov 1258 days
Laurel Mtn3,589 ftMay 20Jun 8Oct 23Oct 5157 days
Leaburg 1 Sw675 ftApr 3May 2Nov 11Oct 21220 days
Lebanon330 ftMar 14Apr 14Nov 18Oct 27248 days
Lemolo Lake 3 Nnw4,077 ftJun 1Jun 21Sep 23Aug 31115 days
Long Creek3,740 ftJun 5Jun 25Sep 14Aug 3099 days
Lookout Pt Dam712 ftMar 7Apr 2Nov 27Nov 1263 days
Lost Creek Dam1,580 ftApr 29May 19Oct 17Oct 1171 days
Madras 2 N2,443 ftMay 19Jun 7Oct 4Sep 20136 days
Malheur Branch Exp Stn2,260 ftApr 23May 9Oct 13Oct 1173 days
Malheur Refuge Hq4,118 ftMay 29Jun 17Sep 18Sep 2113 days
Mapleton17 ftFeb 15Mar 19Dec 9Nov 9306 days
Marion Forks Fish Hatchery2,475 ftMay 15Jun 11Sep 30Sep 10134 days
Mc Dermitt 26 N4,464 ftJun 4Jun 20Sep 26Sep 5113 days
Mc Minnville155 ftApr 5Apr 27Nov 7Oct 20216 days
Mckenzie Rvr Rs1,478 ftMay 1May 19Oct 10Sep 20159 days
Mcminnville Muni AP159 ftApr 15May 6Oct 26Oct 5195 days
Mcnary Dam #2361 ftMar 30Apr 20Nov 4Oct 21217 days
Medford Rogue Vly AP1,297 ftApr 8Apr 30Oct 29Oct 14204 days
Milton Freewater970 ftMar 25Apr 16Oct 29Oct 12218 days
Mitchell 2 E3,320 ftMay 22Jun 11Oct 4Sep 16135 days
Molalla 7NE647 ftMar 16Apr 12Nov 19Oct 31247 days
Monument 21,995 ftMay 9May 26Sep 27Sep 9139 days
Moro1,870 ftMay 12May 31Oct 4Sep 16143 days
N Willamette Exp Stn150 ftMar 18Apr 10Nov 13Oct 27243 days
Nature Park-Beaverton185 ftFeb 11Mar 5Dec 5Nov 11303 days
Newport122 ftMar 21Apr 12Nov 27Nov 1252 days
Newport 1 Se8 ftFeb 19Mar 23Dec 16Nov 14306 days
Newport 3N220 ftMar 12Apr 16Dec 10Nov 7271 days
North Bend Rgnl AP17 ftFeb 21Mar 25Dec 9Nov 12294 days
Nyssa2,175 ftApr 18May 4Oct 18Oct 4182 days
O O Rch4,136 ftJun 11Jul 1Sep 6Aug 1988 days
Oakridge Fish Hatchery1,275 ftApr 24May 11Oct 24Oct 2183 days
Ontario Ksrv2,145 ftApr 22May 7Oct 9Sep 26168 days
Ontario Muni AP2,190 ftApr 21May 8Oct 14Sep 29176 days
Oregon City167 ftMar 18Apr 11Nov 18Oct 30244 days
Otis 2 Ne150 ftApr 4May 3Nov 16Oct 26227 days
Owyhee Dam2,400 ftMay 7May 27Oct 5Sep 19150 days
Paisley4,360 ftJun 6Jun 28Sep 14Aug 2798 days
Parkdale 1 Nne1,520 ftMay 13Jun 3Oct 3Sep 15142 days
Pelton Dam1,410 ftMay 5May 29Oct 7Sep 24154 days
Pendleton1,515 ftApr 26May 10Oct 16Oct 1174 days
Pendleton Branch Exp Stn1,487 ftMay 12Jun 2Sep 27Sep 8135 days
Pendleton Dwtn1,040 ftApr 22May 8Oct 9Sep 27170 days
Pendleton Wfo1,510 ftApr 14May 5Oct 22Oct 7188 days
Pilot Rock 1 Se1,720 ftMay 7May 28Oct 4Sep 16147 days
Port Orford #242 ftFeb 17Mar 19Dec 3Nov 8292 days
Portland Intl AP19 ftMar 13Apr 1Nov 19Oct 29247 days
Portland Kgw-Tv159 ftFeb 25Mar 21Dec 1Nov 10280 days
Portland Troutdale AP29 ftMar 16Apr 12Nov 20Oct 30250 days
Portland Wfo21 ftMar 13Apr 5Nov 22Nov 3251 days
Portland-Hillsboro AP204 ftApr 16May 3Oct 23Oct 3191 days
Powers230 ftMar 21Apr 12Nov 14Oct 21241 days
Prineville2,876 ftJun 1Jun 22Sep 22Aug 31113 days
Prospect 2 Sw2,482 ftMay 19Jun 9Oct 3Sep 13136 days
Redmond Roberts Fld3,043 ftJun 9Jun 26Sep 14Sep 198 days
Rex 1 S515 ftMar 21Apr 19Nov 22Nov 4241 days
Richland2,215 ftMay 10May 29Oct 1Sep 16141 days
Riddle680 ftMar 31Apr 27Nov 6Oct 11221 days
Riley 10 Wsw4,583 ftJun 11Jul 3Sep 11Aug 2387 days
Riverside 7 Ssw3,380 ftJun 7Jun 28Sep 6Aug 2289 days
Rockville 5 N3,670 ftMay 29Jun 23Sep 14Sep 1108 days
Rome 2 Nw3,405 ftJun 11Jul 3Sep 10Aug 2788 days
Rome St AP4,050 ftMay 26Jun 13Sep 21Sep 5117 days
Roseburg Kqen425 ftMar 23Apr 16Nov 18Oct 24237 days
Roseburg Rgnl AP525 ftMar 19Apr 13Nov 20Oct 27245 days
Ruch1,550 ftMay 4May 23Oct 13Sep 22160 days
Saint Helens Rfd269 ftApr 18May 26Nov 7Oct 21201 days
Salem Mcnary Fld205 ftApr 3Apr 27Nov 1Oct 16212 days
Scappoose Ind AP55 ftApr 10May 1Nov 2Oct 16209 days
Scotts Mills 9 Se2,315 ftApr 27May 17Nov 4Oct 18190 days
Seaside10 ftApr 2Apr 29Nov 12Oct 18223 days
Sexton Summit3,832 ftMay 16Jun 7Oct 30Oct 8164 days
Sheaville 1 Se4,620 ftMay 22Jun 14Sep 28Sep 11126 days
Silver Creek Falls1,350 ftApr 30May 15Oct 22Oct 2174 days
Silverton408 ftMar 28Apr 19Nov 10Oct 25227 days
Squaw Butte-Northern Great Bas4,660 ftJun 11Jun 28Sep 28Sep 3107 days
Stayton425 ftMar 29Apr 18Nov 6Oct 20222 days
Summer Lake 1 S4,192 ftJun 8Jun 25Sep 15Aug 3196 days
The Dalles150 ftApr 14May 1Oct 23Oct 5191 days
Three Lynx1,120 ftApr 5Apr 30Nov 8Oct 20217 days
Tillamook12 ftApr 22May 13Oct 21Sep 27183 days
Tillamook 6SE140 ftApr 5May 4Nov 4Oct 13219 days
Toketee Falls2,060 ftApr 29May 16Oct 18Sep 28171 days
Troutdale33 ftMar 26Apr 21Nov 17Oct 26237 days
Union2,777 ftMay 11May 31Sep 26Sep 9136 days
Vale2,240 ftMay 8Jun 7Sep 29Sep 11140 days
Vernonia #2625 ftMay 8May 29Oct 1Sep 11144 days
Wallowa2,923 ftJun 7Jul 7Sep 9Aug 2491 days
Westfall3,040 ftMay 7May 28Oct 3Sep 19147 days
Wickiup Dam4,358 ftJun 7Jul 2Sep 18Sep 3100 days
Winchester460 ftMar 31Apr 26Nov 5Oct 16215 days
Winchester Bay Coast Grd8 ftMar 25Apr 27Nov 24Oct 27249 days
Yachats50 ftFeb 19Mar 23Dec 11Nov 12303 days
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