Oregon Frost Dates: Last and First Frost by Town

190 NOAA weather stations · 1991–2020 U.S. Climate Normals · Data updated 2026-10-29

Quick answer

Across Oregon's 172 NOAA stations with regular frost, the median last spring frost is April 22 and the median first fall frost is October 22. Last frost dates range from January 31 at Brookings to June 11 at Squaw Butte-northern Great Bas, so enter your ZIP code below for the station nearest you.

How frost dates vary across Oregon

Elevation matters: across Oregon's stations, each 1,000 ft of elevation delays the median last frost by about 18 days.
North vs south: stations in the northern third of the state (north of 45.1°N) reach their median last frost about 17 days earlier than the southern third (south of 43.8°N).
Safety margin: the median 10%-risk date (May 10) is about 18 days after the median last frost. Waiting until then cuts the chance of a killing frost on tender transplants from 1 in 2 to 1 in 10.

Frost dates at Oregon's major weather stations

These National Weather Service stations, mostly at airports, have the longest and most complete records in the state.


Astoria Regional Airport	9	Mar 26	Apr 18	Nov 11	232
Aurora State Airport	196	Mar 16	Apr 7	Nov 14	242
Baker City Municipal Airport	3,361	May 25	Jun 16	Sep 15	111
Burns Municipal Airport	4,140	Jun 11	Jun 28	Sep 6	85
Coos Bay 8 SW	12	Apr 15	May 3	Oct 31	199
Corvallis 10 SSW	312	Apr 11	May 5	Oct 30	203
Eugene Mahlon Sweet Airport	353	Apr 11	May 9	Oct 23	196
Hermiston Municipal Airport	641	Apr 26	May 10	Oct 10	167
John Day 35 WNW	2,245	Apr 30	May 14	Oct 14	167
Klamath Falls Intl Airport	4,084	Jun 9	Jun 26	Sep 18	99
McMinnville Municipal Airport	159	Apr 15	May 6	Oct 26	195
Meacham	3,723	Any month	Any month	Any month	48
Medford Rogue Valley Airport	1,297	Apr 8	Apr 30	Oct 29	204
Newport	122	Mar 21	Apr 12	Nov 27	252
North Bend Regional Airport	17	Feb 21	Mar 25	Dec 9	294
Ontario Municipal Airport	2,190	Apr 21	May 8	Oct 14	176
Pendleton	1,515	Apr 26	May 10	Oct 16	174
Portland Intl Airport	19	Mar 13	Apr 1	Nov 19	247
Portland Troutdale Airport	29	Mar 16	Apr 12	Nov 20	250
Portland-hillsboro Airport	204	Apr 16	May 3	Oct 23	191
Redmond Roberts Field	3,043	Jun 9	Jun 26	Sep 14	98
Riley 10 WSW	4,583	Jun 11	Jul 3	Sep 11	87
Rome St Airport	4,050	May 26	Jun 13	Sep 21	117
Roseburg Regional Airport	525	Mar 19	Apr 13	Nov 20	245
Salem McNary Field	205	Apr 3	Apr 27	Nov 1	212
Scappoose Ind Airport	55	Apr 10	May 1	Nov 2	209
Sexton Summit	3,832	May 16	Jun 7	Oct 30	164

All 190 stations in Oregon

Last frost and first frost are medians: a 50% chance of a 32°F night after (spring) or before (fall) that date. 10% risk is the spring date with only a 1-in-10 chance of a later frost. Click a column to sort.

Filter by station name


Alkali Lake	4,332	Jun 10	Jun 27	Sep 14	94
Alsea Fh (fall Creek)	230	Apr 13	May 3	Nov 3	202
Antelope 6 SSW	3,030	May 22	Jun 10	Oct 3	131
Arlington	277	Apr 6	Apr 28	Oct 21	196
Ashland	1,729	May 6	May 27	Oct 8	154
Astoria Regional Airport	9	Mar 26	Apr 18	Nov 11	232
Aurora State Airport	196	Mar 16	Apr 7	Nov 14	242
Austin 3 S	4,213	Any month	Any month	Any month	74
Baker City Municipal Airport	3,361	May 25	Jun 16	Sep 15	111
Bandon 2 NNE	23	Mar 9	Apr 7	Nov 27	260
Barnes Station	3,970	Jun 2	Jun 25	Sep 17	104
Beaverton 2 SSW	270	Apr 1	Apr 26	Nov 6	222
Belknap Springs 8 N	2,152	May 5	May 29	Oct 12	159
Bend	3,660	Jun 6	Jun 22	Sep 20	105
Bend 7 NE	3,358	Any month	Any month	Any month	95
Bly 4 SE	4,560	Jun 8	Jun 23	Sep 17	101
Boardman	280	Apr 14	May 2	Oct 21	188
Bonneville Dam	62	Mar 14	Apr 4	Nov 27	257
Brookings	82	Jan 31	Mar 21	Dec 27	349
Brookings 2 SE	50	Jan 31	Mar 20	Dec 27	334
Brothers	4,640	Any month	Any month	Any month	60
Burns Municipal Airport	4,140	Jun 11	Jun 28	Sep 6	85
Cascade Locks	142	Mar 24	Apr 16	Nov 20	242
Cascadia	960	Apr 29	May 17	Oct 13	167
Cave Junction 1 WNW	1,377	May 1	May 23	Oct 12	161
Chemult	4,760	Any month	Any month	Any month	23
Chiloquin 12 NW (fort Klamath)	4,180	Any month	Any month	Any month	59
Clatskanie	22	Apr 24	May 9	Oct 24	184
Cloverdale	12	Mar 17	Apr 15	Nov 22	251
Condon	2,881	May 10	May 27	Oct 7	148
Coos Bay 8 SW	12	Apr 15	May 3	Oct 31	199
Coquille City	23	Mar 28	Apr 27	Nov 6	225
Corvallis 10 SSW	312	Apr 11	May 5	Oct 30	203
Corvallis State University	225	Apr 17	May 8	Oct 28	194
Corvallis Water Bureau	592	May 15	Jun 2	Oct 8	145
Cottage Grove 2E	595	Apr 24	May 10	Oct 25	183
Cottage Grove Dam	831	Apr 12	May 4	Nov 1	205
Cougar Dam	1,260	Mar 2	Mar 27	Nov 30	274
Crater Lake Nps HQ	6,485	Any month	Any month	Any month	55
Dallas 2 NE	290	Apr 16	May 5	Nov 1	199
Dayville 8 NW	2,260	May 4	May 23	Oct 6	155
Detroit Dam	1,220	Mar 9	Apr 8	Dec 3	270
Dorena	820	Apr 16	May 11	Oct 28	194
Drain	292	Apr 16	May 8	Oct 25	193
Drewsey	3,515	Jun 5	Jun 26	Sep 5	91
Dufur	1,330	May 12	May 31	Oct 7	148
Elgin	2,697	May 24	Jun 21	Sep 18	114
Elkton 1SW	125	Apr 11	May 10	Nov 6	209
Elkton 3 SW	120	Mar 21	Apr 14	Nov 12	240
Enterprise 20 NNE	3,280	Jun 8	Jul 8	Sep 5	84
Estacada 2 SE	514	Mar 27	Apr 23	Nov 14	230
Eugene Mahlon Sweet Airport	353	Apr 11	May 9	Oct 23	196
Falls City 2 SSW	690	Apr 18	May 6	Nov 7	202
Fern Ridge-veneta	485	Apr 18	May 5	Oct 25	189
Fields	4,227	May 10	Jun 3	Oct 7	145
Florence #2	75	Apr 10	May 5	Nov 15	220
Forest Grove	180	Apr 16	May 5	Oct 26	192
Fort Clatsop Natl Memorial	42	Mar 30	Apr 28	Nov 18	233
Fossil	2,650	Jun 3	Jul 3	Sep 14	98
Foster Dam	550	Apr 12	May 5	Oct 28	197
Gerber Dam	4,870	May 31	Jun 17	Sep 21	114
Gold Beach Ranger Station	50	Feb 16	Mar 25	Dec 16	314
Government Camp	3,980	May 27	Jun 14	Oct 9	134
Grants Pass	932	Apr 8	May 1	Oct 28	201
Grizzly	3,635	Any month	Any month	Any month	43
Halfway	2,653	May 15	Jun 2	Sep 24	130
Hart Mountain Refuge	5,618	Any month	Any month	Any month	70
Headworks Portland Wtr B	748	Mar 27	Apr 20	Nov 18	239
Heppner	1,885	Apr 26	May 11	Oct 19	174
Hermiston 2 NW	460	Apr 27	May 11	Oct 7	163
Hermiston Municipal Airport	641	Apr 26	May 10	Oct 10	167
Honeyman State Park	115	Mar 28	Apr 21	Nov 22	237
Hood River Experiment Station	500	Apr 20	May 9	Oct 13	177
Howard Prairie Dam	4,567	Jun 8	Jun 25	Sep 24	108
Huntington	2,110	Apr 23	May 7	Oct 13	172
Idleyld Park 4 NE	1,080	Apr 27	May 15	Oct 19	176
Illahe	348	Mar 30	May 2	Nov 17	233
John Day	3,063	May 28	Jun 15	Sep 18	113
John Day 35 WNW	2,245	Apr 30	May 14	Oct 14	167
Joseph	4,184	May 24	Jul 6	Oct 1	126
Keno	4,128	Jun 5	Jun 22	Sep 20	107
Kent	2,710	May 15	Jun 6	Oct 11	147
Klamath Falls Intl Airport	4,084	Jun 9	Jun 26	Sep 18	99
La Grande	2,755	May 6	May 26	Oct 1	146
Lacomb 3 NNE	520	Apr 26	May 11	Oct 24	184
Lakeview 2 NNW	4,890	Jun 4	Jun 22	Sep 17	102
Langlois #2	90	Mar 16	Apr 15	Nov 29	258
Laurel Mountain	3,589	May 20	Jun 8	Oct 23	157
Leaburg 1 SW	675	Apr 3	May 2	Nov 11	220
Lebanon	330	Mar 14	Apr 14	Nov 18	248
Lemolo Lake 3 NNW	4,077	Jun 1	Jun 21	Sep 23	115
Long Creek	3,740	Jun 5	Jun 25	Sep 14	99
Lookout Point Dam	712	Mar 7	Apr 2	Nov 27	263
Lost Creek Dam	1,580	Apr 29	May 19	Oct 17	171
Madras	2,230	Any month	Any month	Any month	82
Madras 2 N	2,443	May 19	Jun 7	Oct 4	136
Malheur Branch Experiment Station	2,260	Apr 23	May 9	Oct 13	173
Malheur Refuge HQ	4,118	May 29	Jun 17	Sep 18	113
Mapleton	17	Feb 15	Mar 19	Dec 9	306
Marion Forks Fish Hatchery	2,475	May 15	Jun 11	Sep 30	134
Mc Dermitt 26 N	4,464	Jun 4	Jun 20	Sep 26	113
Mc Minnville	155	Apr 5	Apr 27	Nov 7	216
McKenzie River Ranger Station	1,478	May 1	May 19	Oct 10	159
McMinnville Municipal Airport	159	Apr 15	May 6	Oct 26	195
McNary Dam #2	361	Mar 30	Apr 20	Nov 4	217
Meacham	3,723	Any month	Any month	Any month	48
Medford Rogue Valley Airport	1,297	Apr 8	Apr 30	Oct 29	204
Milton Freewater	970	Mar 25	Apr 16	Oct 29	218
Mitchell 2 E	3,320	May 22	Jun 11	Oct 4	135
Molalla 7NE	647	Mar 16	Apr 12	Nov 19	247
Monument 2	1,995	May 9	May 26	Sep 27	139
Moro	1,870	May 12	May 31	Oct 4	143
N Willamette Experiment Station	150	Mar 18	Apr 10	Nov 13	243
Nature Park-beaverton	185	Feb 11	Mar 5	Dec 5	303
Newport	122	Mar 21	Apr 12	Nov 27	252
Newport 1 SE	8	Feb 19	Mar 23	Dec 16	306
Newport 3N	220	Mar 12	Apr 16	Dec 10	271
North Bend Regional Airport	17	Feb 21	Mar 25	Dec 9	294
Nyssa	2,175	Apr 18	May 4	Oct 18	182
O O Rch	4,136	Jun 11	Jul 1	Sep 6	88
Oakridge Fish Hatchery	1,275	Apr 24	May 11	Oct 24	183
Odell Lake-east	4,800	Any month	Any month	Any month	69
Ontario Ksrv	2,145	Apr 22	May 7	Oct 9	168
Ontario Municipal Airport	2,190	Apr 21	May 8	Oct 14	176
Oregon City	167	Mar 18	Apr 11	Nov 18	244
Otis 2 NE	150	Apr 4	May 3	Nov 16	227
Owyhee Dam	2,400	May 7	May 27	Oct 5	150
Paisley	4,360	Jun 6	Jun 28	Sep 14	98
Parkdale 1 NNE	1,520	May 13	Jun 3	Oct 3	142
Paulina	3,684	Any month	Any month	Any month	68
Pelton Dam	1,410	May 5	May 29	Oct 7	154
Pendleton	1,515	Apr 26	May 10	Oct 16	174
Pendleton Branch Experiment Station	1,487	May 12	Jun 2	Sep 27	135
Pendleton Dwtn	1,040	Apr 22	May 8	Oct 9	170
Pendleton WFO	1,510	Apr 14	May 5	Oct 22	188
Pilot Rock 1 SE	1,720	May 7	May 28	Oct 4	147
Port Orford #2	42	Feb 17	Mar 19	Dec 3	292
Portland Intl Airport	19	Mar 13	Apr 1	Nov 19	247
Portland Kgw-tv	159	Feb 25	Mar 21	Dec 1	280
Portland Troutdale Airport	29	Mar 16	Apr 12	Nov 20	250
Portland WFO	21	Mar 13	Apr 5	Nov 22	251
Portland-hillsboro Airport	204	Apr 16	May 3	Oct 23	191
Powers	230	Mar 21	Apr 12	Nov 14	241
Prineville	2,876	Jun 1	Jun 22	Sep 22	113
Prospect 2 SW	2,482	May 19	Jun 9	Oct 3	136
Redmond Roberts Field	3,043	Jun 9	Jun 26	Sep 14	98
Rex 1 S	515	Mar 21	Apr 19	Nov 22	241
Richland	2,215	May 10	May 29	Oct 1	141
Riddle	680	Mar 31	Apr 27	Nov 6	221
Riley 10 WSW	4,583	Jun 11	Jul 3	Sep 11	87
Riverside 7 SSW	3,380	Jun 7	Jun 28	Sep 6	89
Rockville 5 N	3,670	May 29	Jun 23	Sep 14	108
Rome 2 NW	3,405	Jun 11	Jul 3	Sep 10	88
Rome St Airport	4,050	May 26	Jun 13	Sep 21	117
Roseburg Kqen	425	Mar 23	Apr 16	Nov 18	237
Roseburg Regional Airport	525	Mar 19	Apr 13	Nov 20	245
Ruch	1,550	May 4	May 23	Oct 13	160
Saint Helens Rfd	269	Apr 18	May 26	Nov 7	201
Salem McNary Field	205	Apr 3	Apr 27	Nov 1	212
Santiam Junction	3,750	Any month	Any month	Any month	65
Scappoose Ind Airport	55	Apr 10	May 1	Nov 2	209
Scotts Mills 9 SE	2,315	Apr 27	May 17	Nov 4	190
Seaside	10	Apr 2	Apr 29	Nov 12	223
Seneca	4,660	Any month	Any month	Any month	24
Sexton Summit	3,832	May 16	Jun 7	Oct 30	164
Sheaville 1 SE	4,620	May 22	Jun 14	Sep 28	126
Silver Creek Falls	1,350	Apr 30	May 15	Oct 22	174
Silver Lake Ranger Station	4,385	Any month	Any month	Any month	63
Silverton	408	Mar 28	Apr 19	Nov 10	227
Sisters	3,180	Any month	Any month	Any month	57
Squaw Butte-northern Great Bas	4,660	Jun 11	Jun 28	Sep 28	107
Stayton	425	Mar 29	Apr 18	Nov 6	222
Summer Lake 1 S	4,192	Jun 8	Jun 25	Sep 15	96
Sunriver	4,180	Any month	Any month	Any month	42
The Dalles	150	Apr 14	May 1	Oct 23	191
The Poplars	4,310	Any month	Any month	Any month	64
Three Lynx	1,120	Apr 5	Apr 30	Nov 8	217
Tillamook	12	Apr 22	May 13	Oct 21	183
Tillamook 6SE	140	Apr 5	May 4	Nov 4	219
Toketee Falls	2,060	Apr 29	May 16	Oct 18	171
Troutdale	33	Mar 26	Apr 21	Nov 17	237
Union	2,777	May 11	May 31	Sep 26	136
Vale	2,240	May 8	Jun 7	Sep 29	140
Vernonia #2	625	May 8	May 29	Oct 1	144
Wallowa	2,923	Jun 7	Jul 7	Sep 9	91
Westfall	3,040	May 7	May 28	Oct 3	147
Wickiup Dam	4,358	Jun 7	Jul 2	Sep 18	100
Winchester	460	Mar 31	Apr 26	Nov 5	215
Winchester Bay Coast Grd	8	Mar 25	Apr 27	Nov 24	249
Yachats	50	Feb 19	Mar 23	Dec 11	303

Frequently asked questions

When is the last frost in Oregon?

The median last spring frost (32°F) across Oregon's NOAA weather stations is April 22, based on 1991–2020 climate normals. It ranges from January 31 at Brookings to June 11 at Squaw Butte-northern Great Bas. For a safer planting date, use the 10%-risk date; the state median for that is May 10.

When is the first frost in Oregon?

The median first fall frost across Oregon's stations is October 22. The earliest median first frost is September 5 at Drewsey, and the latest is December 27 at Brookings 2 SE.

How long is the growing season in Oregon?

The median frost-free season is 183 days across Oregon's stations, from 84 days at Enterprise 20 NNE to 349 days at Brookings.

When should I plant tomatoes in Oregon?

Plant tomatoes outdoors after your local last frost, ideally after the 10%-risk date when nights stay above 50°F. At a typical Oregon station that means starting seeds indoors 6–8 weeks before April 22 and transplanting from about May 10. Check your ZIP code, because dates vary by weeks across the state.

Can it frost in summer in Oregon?

Yes, at 18 stations in Oregon a 32°F night is possible in any month, mostly at high elevation or far north. There is no reliable frost-free season there; use cold-hardy crops and row covers.

How to use these dates

Frost dates are 30-year averages from NOAA, not forecasts. Use them to plan seed starting and planting, then watch the 10-day forecast as the date approaches. Cold air settles in valleys and low spots, so a garden at the bottom of a slope can frost a week or more later in spring than the nearest station shows.

Ready to plan? The planting calendar by ZIP code turns these dates into start-indoors, transplant and sowing dates for 30 crops.

Sources and method

Dates are the 32°F freeze probabilities published in the NOAA NCEI 1991–2020 U.S. Climate Normals for each station. Station names are NOAA's, lightly expanded for readability. See the methodology or download the full table.