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Washington frost dates by weather station

Washington has 156 NOAA weather stations with 1991–2020 freeze statistics. Median last spring frost dates run from Feb 26 at Olga 2 SE to Jun 6 at Davenport.

156Stations
Feb 26Earliest last frostOlga 2 SE
Jun 6Latest last frostDavenport
276 daysLongest growing seasonOlga 2 SE

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Washington stations: median (50%) frost dates at 32°F
Station	Last spring frost	First fall frost	Growing season	Elevation
Aberdeen	Mar 29	Nov 15	234 days	10 ft
Aberdeen 20nne	Apr 15	Nov 2	200 days	435 ft
Anacortes	Mar 8	Nov 20	255 days	20 ft
Arlington	Apr 22	Oct 19	181 days	100 ft
Baring	Apr 14	Oct 29	197 days	770 ft
Battle Ground	Apr 26	Oct 16	174 days	284 ft
Bellingham 3 SSW	Apr 1	Nov 2	216 days	15 ft
Bellingham Intl Airport	Mar 31	Oct 30	211 days	149 ft
Bickleton	May 16	Oct 9	144 days	3,015 ft
Blaine	Mar 31	Nov 4	219 days	60 ft
Boundary Dam	May 4	Oct 4	153 days	1,837 ft
Bremerton	Mar 29	Nov 14	227 days	110 ft
Buckley 1 NE	Apr 7	Oct 30	204 days	685 ft
Carson Fish Hatchery	May 2	Oct 9	161 days	1,134 ft
Cedar Lake	Apr 23	Nov 1	193 days	1,560 ft
Centralia	Apr 22	Oct 27	188 days	185 ft
Chelan	Apr 17	Oct 22	187 days	1,194 ft
Chewelah	May 16	Sep 15	120 days	1,670 ft
Chief Joseph Dam	Apr 26	Oct 11	167 days	834 ft
Cle Elum	May 13	Sep 25	132 days	1,900 ft
Clearbrook	Apr 18	Oct 18	185 days	64 ft
Clearwater	Apr 29	Oct 17	171 days	80 ft
Colville	May 2	Oct 2	153 days	1,554 ft
Concrete Ppl Fish Station	Mar 28	Nov 14	229 days	195 ft
Connell 1 W	Apr 30	Oct 12	165 days	1,020 ft
Cougar 6 E	Apr 1	Nov 18	227 days	659 ft
Coulee Dam 1 SW	Apr 22	Oct 21	180 days	1,719 ft
Coupeville 1 S	Mar 17	Nov 11	237 days	50 ft
Cushman Powerhouse #2	Mar 24	Nov 15	235 days	21 ft
Darrington 21 NNE	Apr 16	Oct 25	192 days	407 ft
Darrington Ranger Station	Apr 16	Oct 23	190 days	550 ft
Davenport	Jun 6	Sep 11	94 days	2,369 ft
Dayton 1 WSW	Apr 28	Oct 13	168 days	1,557 ft
Deer Park Airport	May 22	Sep 14	112 days	2,191 ft
Diablo Dam	Apr 10	Nov 1	203 days	891 ft
Easton	May 9	Oct 6	151 days	2,170 ft
Ellensburg	May 8	Oct 2	146 days	1,480 ft
Ellensburg Bowers Field	Apr 28	Oct 7	163 days	1,766 ft
Elma	May 1	Oct 14	169 days	70 ft
Eltopia 8 WSW	Apr 21	Oct 22	182 days	700 ft
Elwha Ranger Station	Apr 9	Nov 3	209 days	360 ft
Entiat Fish Hatchery	Apr 5	Oct 24	200 days	1,027 ft
Ephrata Muni Airport	Apr 22	Oct 17	175 days	1,252 ft
Everett	Mar 24	Nov 2	223 days	60 ft
Everett Snohomish Airport	Mar 9	Nov 17	250 days	606 ft
Forks 1 E	Apr 26	Oct 25	182 days	350 ft
Friday Harbor Airport	Mar 26	Nov 10	230 days	109 ft
Glenoma	Apr 24	Oct 15	176 days	840 ft
Glenwood #2	any month	any month	72 days	1,902 ft
Goldendale	May 19	Sep 25	126 days	1,640 ft
Grayland	Mar 29	Nov 7	224 days	10 ft
Grays River Hatchery	Apr 27	Oct 22	178 days	100 ft
Harrington	May 31	Sep 12	101 days	2,159 ft
Hartline	May 2	Oct 12	162 days	1,906 ft
Hatton 9 SE	Apr 25	Oct 15	173 days	1,505 ft
Holden Village	May 25	Sep 19	114 days	3,218 ft
Hoquiam Bowerman Airport	Mar 30	Nov 14	228 days	12 ft
Humptulips Salmon Hatchery	Apr 26	Oct 22	180 days	140 ft
Ice Harbor Dam	Apr 7	Oct 22	199 days	368 ft
Kennewick	Mar 28	Oct 30	216 days	390 ft
Kent	Mar 20	Nov 10	233 days	30 ft
Lacrosse	May 13	Sep 26	133 days	1,476 ft
Landsburg	Apr 20	Oct 25	187 days	535 ft
Leavenworth 3 S	May 10	Sep 30	142 days	1,128 ft
Lind 3 NE	May 7	Oct 4	150 days	1,630 ft
Long Beach Exp. Station	Apr 6	Oct 26	200 days	25 ft
Longmire Rainier NPS	May 22	Oct 3	134 days	2,762 ft
Longview	Apr 8	Nov 5	210 days	12 ft
Matlock 8 S	Apr 23	Oct 20	183 days	110 ft
Mayfield Power Plant	Apr 7	Nov 13	215 days	280 ft
Mazama	May 9	Sep 29	142 days	2,141 ft
McMillin Rsvr	Apr 11	Oct 30	202 days	579 ft
McNary Dam	Mar 27	Nov 4	221 days	361 ft
Methow 2 S	Apr 21	Oct 15	177 days	1,135 ft
Monroe	Apr 17	Oct 23	188 days	120 ft
Moses Lake Grant Co Airport	Apr 27	Oct 8	165 days	1,196 ft
Mount Adams Ranger Station	May 18	Sep 25	125 days	1,950 ft
Mount Vernon 3 WNW	Mar 24	Nov 3	224 days	14 ft
Moxee City 10 E	May 4	Oct 10	155 days	1,550 ft
Mud Mountain Dam	Apr 18	Oct 31	196 days	1,308 ft
Naselle 2 ENE	Apr 24	Oct 20	179 days	50 ft
Newhalem	Apr 2	Nov 14	224 days	525 ft
Newport	May 12	Sep 21	130 days	2,162 ft
Northport	May 8	Oct 1	143 days	1,497 ft
Odessa	May 14	Sep 26	135 days	1,543 ft
Olga 2 SE	Feb 26	Nov 29	276 days	80 ft
Olympia Airport	Apr 29	Oct 14	169 days	188 ft
Omak Airport	Apr 30	Oct 7	160 days	1,296 ft
Packwood	Apr 30	Oct 8	162 days	1,060 ft
Palmer 3 ESE	Apr 3	Nov 11	219 days	920 ft
Pasco Tri Cities Airport	Apr 27	Oct 11	168 days	407 ft
Plain	May 22	Sep 22	121 days	1,936 ft
Pomeroy	May 2	Oct 4	155 days	1,934 ft
Port Angeles	Mar 12	Nov 19	252 days	90 ft
Port Angeles Intl Airport	Apr 8	Oct 31	204 days	288 ft
Port Townsend	Mar 1	Nov 28	274 days	100 ft
Priest Rapids Dam	Mar 24	Nov 4	222 days	428 ft
Prosser	Apr 14	Oct 22	189 days	830 ft
Pullman 2 NW	May 6	Sep 29	143 days	2,515 ft
Pullman Moscow Regional Airport	Apr 29	Oct 2	159 days	2,551 ft
Quilcene 2 SW	Apr 11	Oct 28	199 days	123 ft
Quillayute State Airport	Apr 20	Oct 26	190 days	185 ft
Quinault 4 NE	Apr 7	Nov 10	214 days	286 ft
Quincy	Apr 21	Oct 16	178 days	1,286 ft
Rainier Paradise Ranger Station	any month	any month	65 days	5,427 ft
Raymond 2 S	Apr 26	Oct 17	177 days	30 ft
Renton Muni Airport	Mar 13	Nov 16	248 days	29 ft
Republic	May 30	Sep 10	102 days	2,555 ft
Richland	Apr 6	Oct 24	200 days	373 ft
Ritzville 1 SSE	May 7	Oct 10	153 days	1,864 ft
Rosalia	May 7	Sep 28	144 days	2,420 ft
Ross Dam	Apr 8	Nov 10	214 days	1,236 ft
Sagemoor	Apr 30	Oct 13	166 days	595 ft
Satus Pass 2 SSW	Jun 2	Oct 1	119 days	2,585 ft
Seattle Boeing Field	Mar 13	Nov 17	247 days	20 ft
Seattle Sand Point Wsfo	Mar 8	Nov 23	259 days	60 ft
Seattle Tacoma Intl Airport	Mar 2	Nov 23	266 days	370 ft
Sedro-Woolley	Mar 27	Nov 6	224 days	60 ft
Selah 2 NE	May 5	Oct 4	149 days	1,120 ft
Sequim 2 E	Apr 21	Oct 20	181 days	50 ft
Shelton Sanderson Field	Apr 27	Oct 16	175 days	271 ft
Skamania Fish Hatchery	Apr 29	Oct 22	177 days	435 ft
Smyrna	Apr 23	Oct 12	172 days	560 ft
Snoqualmie Falls	Mar 30	Nov 7	223 days	440 ft
Snowden	May 12	Oct 11	149 days	2,415 ft
Spokane 17 SSW	May 30	Sep 4	94 days	2,267 ft
Spokane Felts Field	Apr 26	Oct 15	170 days	1,953 ft
Spokane Intl Airport	Apr 26	Oct 12	168 days	2,353 ft
Spokane WFO	May 10	Sep 26	137 days	2,392 ft
St. John	Apr 29	Oct 4	161 days	1,952 ft
Stampede Pass	May 14	Oct 17	154 days	3,959 ft
Startup 1 E	Apr 15	Oct 25	192 days	170 ft
Stehekin 4 NW	Apr 27	Oct 17	173 days	1,257 ft
Sunnyside	May 1	Oct 6	157 days	747 ft
Sunnyside #2	Apr 30	Oct 8	160 days	805 ft
Tacoma #1	Mar 8	Nov 14	250 days	25 ft
Tacoma Narrows Airport	Mar 11	Nov 21	254 days	292 ft
The Dalles Muni Airport	Apr 11	Oct 26	197 days	235 ft
Toledo FAA Airport	Apr 5	Oct 25	196 days	379 ft
Tolt S Fk Rsvr	Apr 13	Nov 10	210 days	2,000 ft
Tonasket 11ne	May 6	Oct 6	151 days	3,434 ft
Tonasket 4 NNE	Apr 26	Oct 10	168 days	960 ft
Upper Baker Dam	Apr 24	Oct 29	190 days	690 ft
Vancouver 4 NNE	Apr 26	Oct 18	177 days	210 ft
Vancouver Pearson Airport	Mar 29	Nov 9	223 days	30 ft
Walla Walla Regional Airport	Mar 27	Oct 31	219 days	1,166 ft
Wapato	Apr 21	Oct 15	176 days	841 ft
Waterville	May 14	Oct 1	140 days	2,664 ft
Wenatchee	Apr 4	Oct 28	208 days	626 ft
Wenatchee Pangborn Airport	Apr 8	Oct 24	200 days	1,229 ft
Whidbey Island NAS	Mar 13	Nov 14	244 days	47 ft
Whitman Mission	May 2	Oct 1	151 days	632 ft
Wilbur	Jun 1	Sep 22	112 days	2,262 ft
Winthrop 1 WSW	May 15	Sep 22	127 days	1,749 ft
Yakima #2	Apr 8	Oct 23	196 days	1,142 ft
Yakima Air Terminal	May 8	Oct 4	149 days	1,064 ft

Sources

NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.

Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.