Washington Frost Dates: Last and First Frost by Town

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

Quick answer

Across Washington's 154 NOAA stations with regular frost, the median last spring frost is April 23 and the median first fall frost is October 20. Last frost dates range from February 26 at Olga 2 SE to June 6 at Davenport, so enter your ZIP code below for the station nearest you.

How frost dates vary across Washington

Elevation matters: across Washington's stations, each 1,000 ft of elevation delays the median last frost by about 17 days.
North vs south: stations in the northern third of the state (north of 47.8°N) reach their median last frost about 9 days earlier than the southern third (south of 47.0°N).
Safety margin: the median 10%-risk date (May 10) is about 17 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 Washington's major weather stations

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


Bellingham Intl Airport	149	Mar 31	Apr 18	Oct 30	211
Darrington 21 NNE	407	Apr 16	May 6	Oct 25	192
Deer Park Airport	2,191	May 22	Jun 15	Sep 14	112
Ellensburg Bowers Field	1,766	Apr 28	May 12	Oct 7	163
Ephrata Municipal Airport	1,252	Apr 22	May 6	Oct 17	175
Everett Snohomish Airport	606	Mar 9	Mar 29	Nov 17	250
Friday Harbor Airport	109	Mar 26	Apr 21	Nov 10	230
Hoquiam Bowerman Airport	12	Mar 30	Apr 25	Nov 14	228
Moses Lake Grant County Airport	1,196	Apr 27	May 11	Oct 8	165
Olympia Airport	188	Apr 29	May 15	Oct 14	169
Omak Airport	1,296	Apr 30	May 15	Oct 7	160
Pasco Tri Cities Airport	407	Apr 27	May 10	Oct 11	168
Port Angeles Intl Airport	288	Apr 8	May 1	Oct 31	204
Pullman Moscow Regional Airport	2,551	Apr 29	May 14	Oct 2	159
Quillayute State Airport	185	Apr 20	May 10	Oct 26	190
Quinault 4 NE	286	Apr 7	May 6	Nov 10	214
Renton Municipal Airport	29	Mar 13	Mar 31	Nov 16	248
Seattle Boeing Field	20	Mar 13	Apr 1	Nov 17	247
Seattle Sand Point Wsfo	60	Mar 8	Mar 29	Nov 23	259
Seattle Tacoma Intl Airport	370	Mar 2	Mar 23	Nov 23	266
Shelton Sanderson Field	271	Apr 27	May 12	Oct 16	175
Spokane 17 SSW	2,267	May 30	Jul 13	Sep 4	94
Spokane Felts Field	1,953	Apr 26	May 10	Oct 15	170
Spokane Intl Airport	2,353	Apr 26	May 10	Oct 12	168
Stampede Pass	3,959	May 14	Jun 5	Oct 17	154
Tacoma Narrows Airport	292	Mar 11	Apr 2	Nov 21	254
The Dalles Municipal Airport	235	Apr 11	Apr 28	Oct 26	197
Toledo Faa Airport	379	Apr 5	May 4	Oct 25	196
Vancouver Pearson Airport	30	Mar 29	Apr 18	Nov 9	223
Walla Walla Regional Airport	1,166	Mar 27	Apr 22	Oct 31	219
Wenatchee Pangborn Airport	1,229	Apr 8	Apr 23	Oct 24	200
Whidbey Island NAS	47	Mar 13	Apr 1	Nov 14	244
Yakima Air Terminal	1,064	May 8	May 27	Oct 4	149

All 156 stations in Washington

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


Aberdeen	10	Mar 29	Apr 20	Nov 15	234
Aberdeen 20NNE	435	Apr 15	May 8	Nov 2	200
Anacortes	20	Mar 8	Mar 28	Nov 20	255
Arlington	100	Apr 22	May 6	Oct 19	181
Baring	770	Apr 14	May 4	Oct 29	197
Battle Ground	284	Apr 26	May 12	Oct 16	174
Bellingham 3 SSW	15	Apr 1	Apr 24	Nov 2	216
Bellingham Intl Airport	149	Mar 31	Apr 18	Oct 30	211
Bickleton	3,015	May 16	Jun 10	Oct 9	144
Blaine	60	Mar 31	Apr 22	Nov 4	219
Boundary Dam	1,837	May 4	May 18	Oct 4	153
Bremerton	110	Mar 29	Apr 24	Nov 14	227
Buckley 1 NE	685	Apr 7	Apr 27	Oct 30	204
Carson Fish Hatchery	1,134	May 2	May 20	Oct 9	161
Cedar Lake	1,560	Apr 23	May 13	Nov 1	193
Centralia	185	Apr 22	May 10	Oct 27	188
Chelan	1,194	Apr 17	Apr 30	Oct 22	187
Chewelah	1,670	May 16	Jun 7	Sep 15	120
Chief Joseph Dam	834	Apr 26	May 13	Oct 11	167
Cle Elum	1,900	May 13	Jun 1	Sep 25	132
Clearbrook	64	Apr 18	May 5	Oct 18	185
Clearwater	80	Apr 29	May 16	Oct 17	171
Colville	1,554	May 2	May 17	Oct 2	153
Concrete Ppl Fish Station	195	Mar 28	Apr 19	Nov 14	229
Connell 1 W	1,020	Apr 30	May 15	Oct 12	165
Cougar 6 E	659	Apr 1	May 2	Nov 18	227
Coulee Dam 1 SW	1,719	Apr 22	May 7	Oct 21	180
Coupeville 1 S	50	Mar 17	Apr 3	Nov 11	237
Cushman Powerhouse #2	21	Mar 24	Apr 17	Nov 15	235
Darrington 21 NNE	407	Apr 16	May 6	Oct 25	192
Darrington Ranger Station	550	Apr 16	May 5	Oct 23	190
Davenport	2,369	Jun 6	Jul 5	Sep 11	94
Dayton 1 WSW	1,557	Apr 28	May 14	Oct 13	168
Deer Park Airport	2,191	May 22	Jun 15	Sep 14	112
Diablo Dam	891	Apr 10	May 1	Nov 1	203
Easton	2,170	May 9	May 26	Oct 6	151
Ellensburg	1,480	May 8	May 25	Oct 2	146
Ellensburg Bowers Field	1,766	Apr 28	May 12	Oct 7	163
Elma	70	May 1	May 19	Oct 14	169
Eltopia 8 WSW	700	Apr 21	May 6	Oct 22	182
Elwha Ranger Station	360	Apr 9	Apr 29	Nov 3	209
Entiat Fish Hatchery	1,027	Apr 5	May 2	Oct 24	200
Ephrata Municipal Airport	1,252	Apr 22	May 6	Oct 17	175
Everett	60	Mar 24	Apr 11	Nov 2	223
Everett Snohomish Airport	606	Mar 9	Mar 29	Nov 17	250
Forks 1 E	350	Apr 26	May 10	Oct 25	182
Friday Harbor Airport	109	Mar 26	Apr 21	Nov 10	230
Glenoma	840	Apr 24	May 12	Oct 15	176
Glenwood #2	1,902	Any month	Any month	Any month	72
Goldendale	1,640	May 19	Jun 9	Sep 25	126
Grayland	10	Mar 29	Apr 24	Nov 7	224
Grays River Hatchery	100	Apr 27	May 18	Oct 22	178
Harrington	2,159	May 31	Jun 28	Sep 12	101
Hartline	1,906	May 2	May 22	Oct 12	162
Hatton 9 SE	1,505	Apr 25	May 11	Oct 15	173
Holden Village	3,218	May 25	Jun 12	Sep 19	114
Hoquiam Bowerman Airport	12	Mar 30	Apr 25	Nov 14	228
Humptulips Salmon Hatchery	140	Apr 26	May 15	Oct 22	180
Ice Harbor Dam	368	Apr 7	Apr 30	Oct 22	199
Kennewick	390	Mar 28	Apr 10	Oct 30	216
Kent	30	Mar 20	Apr 8	Nov 10	233
Lacrosse	1,476	May 13	Jun 1	Sep 26	133
Landsburg	535	Apr 20	May 10	Oct 25	187
Leavenworth 3 S	1,128	May 10	May 28	Sep 30	142
Lind 3 NE	1,630	May 7	May 21	Oct 4	150
Long Beach Experiment Station	25	Apr 6	Apr 28	Oct 26	200
Longmire Rainier Nps	2,762	May 22	Jun 9	Oct 3	134
Longview	12	Apr 8	May 2	Nov 5	210
Matlock 8 S	110	Apr 23	May 7	Oct 20	183
Mayfield Pwr Plt	280	Apr 7	May 8	Nov 13	215
Mazama	2,141	May 9	May 24	Sep 29	142
McMillin Rsvr	579	Apr 11	Apr 29	Oct 30	202
McNary Dam	361	Mar 27	Apr 14	Nov 4	221
Methow 2 S	1,135	Apr 21	May 10	Oct 15	177
Monroe	120	Apr 17	May 7	Oct 23	188
Moses Lake Grant County Airport	1,196	Apr 27	May 11	Oct 8	165
Mount Adams Ranger Station	1,950	May 18	Jun 12	Sep 25	125
Mount Vernon 3 WNW	14	Mar 24	Apr 14	Nov 3	224
Moxee City 10 E	1,550	May 4	May 23	Oct 10	155
Mud Mountain Dam	1,308	Apr 18	May 10	Oct 31	196
Naselle 2 ENE	50	Apr 24	May 11	Oct 20	179
Newhalem	525	Apr 2	Apr 27	Nov 14	224
Newport	2,162	May 12	May 29	Sep 21	130
Northport	1,497	May 8	May 26	Oct 1	143
Odessa	1,543	May 14	May 31	Sep 26	135
Olga 2 SE	80	Feb 26	Mar 23	Nov 29	276
Olympia Airport	188	Apr 29	May 15	Oct 14	169
Omak Airport	1,296	Apr 30	May 15	Oct 7	160
Packwood	1,060	Apr 30	May 17	Oct 8	162
Palmer 3 ESE	920	Apr 3	May 2	Nov 11	219
Pasco Tri Cities Airport	407	Apr 27	May 10	Oct 11	168
Plain	1,936	May 22	Jun 13	Sep 22	121
Pomeroy	1,934	May 2	May 19	Oct 4	155
Port Angeles	90	Mar 12	Apr 1	Nov 19	252
Port Angeles Intl Airport	288	Apr 8	May 1	Oct 31	204
Port Townsend	100	Mar 1	Mar 23	Nov 28	274
Priest Rapids Dam	428	Mar 24	Apr 7	Nov 4	222
Prosser	830	Apr 14	May 7	Oct 22	189
Pullman 2 NW	2,515	May 6	May 25	Sep 29	143
Pullman Moscow Regional Airport	2,551	Apr 29	May 14	Oct 2	159
Quilcene 2 SW	123	Apr 11	May 1	Oct 28	199
Quillayute State Airport	185	Apr 20	May 10	Oct 26	190
Quinault 4 NE	286	Apr 7	May 6	Nov 10	214
Quincy	1,286	Apr 21	May 5	Oct 16	178
Rainier Paradise Ranger Station	5,427	Any month	Any month	Any month	65
Raymond 2 S	30	Apr 26	May 12	Oct 17	177
Renton Municipal Airport	29	Mar 13	Mar 31	Nov 16	248
Republic	2,555	May 30	Jun 17	Sep 10	102
Richland	373	Apr 6	Apr 24	Oct 24	200
Ritzville 1 SSE	1,864	May 7	May 27	Oct 10	153
Rosalia	2,420	May 7	May 25	Sep 28	144
Ross Dam	1,236	Apr 8	Apr 30	Nov 10	214
Sagemoor	595	Apr 30	May 16	Oct 13	166
Satus Pass 2 SSW	2,585	Jun 2	Jun 22	Oct 1	119
Seattle Boeing Field	20	Mar 13	Apr 1	Nov 17	247
Seattle Sand Point Wsfo	60	Mar 8	Mar 29	Nov 23	259
Seattle Tacoma Intl Airport	370	Mar 2	Mar 23	Nov 23	266
Sedro-woolley	60	Mar 27	Apr 17	Nov 6	224
Selah 2 NE	1,120	May 5	May 23	Oct 4	149
Sequim 2 E	50	Apr 21	May 7	Oct 20	181
Shelton Sanderson Field	271	Apr 27	May 12	Oct 16	175
Skamania Fish Hatchery	435	Apr 29	May 15	Oct 22	177
Smyrna	560	Apr 23	May 7	Oct 12	172
Snoqualmie Falls	440	Mar 30	Apr 21	Nov 7	223
Snowden	2,415	May 12	Jun 7	Oct 11	149
Spokane 17 SSW	2,267	May 30	Jul 13	Sep 4	94
Spokane Felts Field	1,953	Apr 26	May 10	Oct 15	170
Spokane Intl Airport	2,353	Apr 26	May 10	Oct 12	168
Spokane WFO	2,392	May 10	May 30	Sep 26	137
St John	1,952	Apr 29	May 15	Oct 4	161
Stampede Pass	3,959	May 14	Jun 5	Oct 17	154
Startup 1 E	170	Apr 15	May 7	Oct 25	192
Stehekin 4 NW	1,257	Apr 27	May 12	Oct 17	173
Sunnyside	747	May 1	May 18	Oct 6	157
Sunnyside #2	805	Apr 30	May 13	Oct 8	160
Tacoma #1	25	Mar 8	Mar 31	Nov 14	250
Tacoma Narrows Airport	292	Mar 11	Apr 2	Nov 21	254
The Dalles Municipal Airport	235	Apr 11	Apr 28	Oct 26	197
Toledo Faa Airport	379	Apr 5	May 4	Oct 25	196
Tolt S Fk Rsvr	2,000	Apr 13	May 4	Nov 10	210
Tonasket 11NE	3,434	May 6	May 25	Oct 6	151
Tonasket 4 NNE	960	Apr 26	May 11	Oct 10	168
Upper Baker Dam	690	Apr 24	May 9	Oct 29	190
Vancouver 4 NNE	210	Apr 26	May 10	Oct 18	177
Vancouver Pearson Airport	30	Mar 29	Apr 18	Nov 9	223
Walla Walla Regional Airport	1,166	Mar 27	Apr 22	Oct 31	219
Wapato	841	Apr 21	May 7	Oct 15	176
Waterville	2,664	May 14	Jun 4	Oct 1	140
Wenatchee	626	Apr 4	Apr 19	Oct 28	208
Wenatchee Pangborn Airport	1,229	Apr 8	Apr 23	Oct 24	200
Whidbey Island NAS	47	Mar 13	Apr 1	Nov 14	244
Whitman Mission	632	May 2	May 18	Oct 1	151
Wilbur	2,262	Jun 1	Jun 22	Sep 22	112
Winthrop 1 WSW	1,749	May 15	Jun 1	Sep 22	127
Yakima #2	1,142	Apr 8	Apr 28	Oct 23	196
Yakima Air Terminal	1,064	May 8	May 27	Oct 4	149

Frequently asked questions

When is the last frost in Washington?

The median last spring frost (32°F) across Washington's NOAA weather stations is April 23, based on 1991–2020 climate normals. It ranges from February 26 at Olga 2 SE to June 6 at Davenport. For a safer planting date, use the 10%-risk date; the state median for that is May 10.

When is the first frost in Washington?

The median first fall frost across Washington's stations is October 20. The earliest median first frost is September 4 at Spokane 17 SSW, and the latest is November 29 at Olga 2 SE.

How long is the growing season in Washington?

The median frost-free season is 180 days across Washington's stations, from 94 days at Davenport to 276 days at Olga 2 SE.

When should I plant tomatoes in Washington?

Plant tomatoes outdoors after your local last frost, ideally after the 10%-risk date when nights stay above 50°F. At a typical Washington station that means starting seeds indoors 6–8 weeks before April 23 and transplanting from about May 10. Check your ZIP code, because dates vary by weeks across the state.

Can it frost in summer in Washington?

Yes, at 2 stations in Washington 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.