Arizona Frost Dates: Last and First Frost by Town

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

Quick answer

Across Arizona's 174 NOAA stations with regular frost, the median last spring frost is March 30 and the median first fall frost is November 13. Last frost dates range from January 4 at Bullhead City to June 23 at Flagstaff 4 SW, so enter your ZIP code below for the station nearest you.

How frost dates vary across Arizona

Elevation matters: across Arizona's stations, each 1,000 ft of elevation delays the median last frost by about 20 days.
North vs south: stations in the northern third of the state (north of 34.6°N) reach their median last frost about 42 days later than the southern third (south of 33.0°N).
Safety margin: the median 10%-risk date (April 19) is about 20 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-free sites: 1 station rarely see 32°F at all.

Frost dates at Arizona's major weather stations

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


Douglas Bisbee Inl Airport	4,105	Apr 11	Apr 27	Nov 2	203
Elgin 5 S	4,811	Apr 18	May 3	Nov 1	195
Flagstaff Pulliam Airport	7,003	Jun 4	Jun 19	Sep 28	115
Fort Huachuca Pioneer Airfield	4,768	Mar 16	Apr 12	Nov 21	246
Grand Canyon National Park Airport	6,606	Jun 17	Jul 1	Sep 24	97
Kingman Mohave County Airport	3,420	Apr 2	Apr 21	Nov 11	220
Nogales Intl Airport	3,932	Mar 20	Apr 13	Nov 17	239
Page Municipal Airport	4,310	Mar 7	Mar 31	Nov 15	250
Payson	4,850	Apr 29	May 20	Oct 24	176
Phoenix Deer Valley Municipal Airport	1,455	Jan 8	Feb 12	Dec 25	354
Phoenix Sky Harbor Intl Airport	1,107	Jan 5	Jan 22	Jan 3	365
Prescott Love Field	5,042	Apr 20	May 7	Oct 27	188
Safford Municipal Airport	3,176	Mar 8	Mar 27	Nov 20	254
Scottsdale Municipal Airport	1,473	Jan 6	Feb 7	Dec 26	353
St Johns Industrial Airport	5,733	May 3	May 19	Oct 10	160
Tucson 11 W	2,733	Feb 8	Mar 8	Dec 10	303
Tucson Intl Airport	2,549	Feb 5	Mar 2	Dec 9	307
Williams 35 NNW	5,990	May 9	May 27	Oct 19	161
Window Rock Airport	6,739	May 29	Jun 10	Sep 28	121
Winslow Municipal Airport	4,886	Apr 27	May 14	Oct 18	174
Yuma 27 ENE	620	Jan 11	Feb 14	Dec 21	347
Yuma McAs	213	Rare	Rare	Rare	365
Yuma Proving Ground	324	Jan 4	Feb 9	Dec 25	361

All 175 stations in Arizona

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


Aguila	2,165	Mar 17	Apr 12	Nov 19	243
Ajo	1,751	Jan 10	Feb 15	Dec 21	347
Alamo Dam	1,290	Mar 4	Mar 31	Nov 23	261
Alpine	8,050	Jun 15	Jun 30	Sep 21	96
Anvil Rch	2,759	Mar 27	Apr 18	Nov 9	226
Apache Junction 5 NE	2,070	Feb 11	Mar 7	Dec 10	304
Arizona City	1,525	Feb 28	Mar 14	Nov 21	266
Bagdad	3,935	Apr 7	May 3	Nov 12	217
Beaver Dam	1,931	Mar 7	Apr 10	Nov 19	251
Bellemont WFO	7,152	Jun 21	Jul 4	Sep 17	85
Benson 6SE	3,690	Apr 12	Apr 29	Nov 1	202
Betatakin	7,286	May 7	May 26	Oct 15	159
Bisbee 1WNW	5,560	Apr 1	Apr 20	Nov 10	222
Black River Pumps	6,065	May 16	Jun 2	Oct 13	149
Blue Ridge Ranger Station	6,880	May 31	Jun 12	Oct 2	126
Bouse	925	Feb 18	Mar 12	Nov 28	284
Bowie	3,777	Apr 1	Apr 18	Nov 6	217
Bright Angel Ranger Station	8,000	Jun 3	Jun 19	Sep 27	113
Bullhead City	531	Jan 4	Feb 5	Dec 23	356
Canelo 1 NW	5,010	Apr 23	May 7	Oct 30	188
Canyon De Chelly	5,610	May 6	May 31	Oct 8	153
Carefree	2,530	Feb 4	Mar 9	Dec 16	313
Casa Grande	1,400	Feb 5	Feb 28	Dec 6	305
Casa Grande National Monument	1,419	Feb 17	Mar 8	Nov 29	284
Cascabel	3,194	Apr 24	May 9	Oct 31	187
Castle Hot Springs	1,990	Jan 15	Feb 21	Dec 22	341
Catalina State Park	2,707	Apr 2	Apr 18	Nov 11	222
Chandler Heights	1,425	Feb 1	Feb 27	Dec 11	315
Childs	2,650	Apr 2	Apr 20	Nov 11	223
Chino Valley	4,750	Apr 27	May 18	Oct 24	178
Chiricahua National Monument	5,300	Apr 16	Apr 30	Nov 8	203
Clifton	3,520	Feb 26	Mar 15	Nov 23	268
Colorado City	5,001	Apr 26	May 15	Oct 25	180
Cordes	3,771	Apr 5	Apr 24	Nov 17	221
Coronado Nmem	5,242	Apr 7	Apr 27	Nov 9	213
Dateland Whitewing Rch	520	Jan 25	Feb 25	Dec 13	324
Diamond M Rch	5,492	May 17	Jun 4	Oct 10	146
Douglas	4,040	Mar 18	Apr 12	Nov 13	235
Douglas Bisbee Inl Airport	4,105	Apr 11	Apr 27	Nov 2	203
Duncan	3,660	Apr 24	May 8	Oct 25	183
E Mesa	1,518	Feb 1	Feb 28	Dec 10	312
Ehrenberg 2 E	465	Jan 4	Feb 10	Dec 19	347
Elgin 5 S	4,811	Apr 18	May 3	Nov 1	195
Eloy 4 NE	1,545	Feb 24	Mar 18	Nov 28	273
Flagstaff 4 SW	7,125	Jun 23	Jul 7	Sep 15	81
Flagstaff Pulliam Airport	7,003	Jun 4	Jun 19	Sep 28	115
Florence	1,400	Jan 30	Feb 24	Dec 12	319
Fort Huachuca Pioneer Airfield	4,768	Mar 16	Apr 12	Nov 21	246
Fort Thomas 2 SW	2,835	Apr 1	Apr 18	Nov 6	217
Fort Valley	7,347	Jun 11	Jun 30	Sep 25	99
Fountain Hills	1,580	Jan 6	Feb 11	Dec 28	356
Ganado	6,340	May 15	Jun 1	Oct 10	147
Gila Bend 2SE	794	Jan 23	Feb 19	Dec 11	323
Globe #3	3,660	Mar 11	Mar 29	Nov 21	253
Grand Canyon E Entrance	7,480	May 10	May 24	Oct 20	165
Grand Canyon National Park 2	6,785	Jun 1	Jun 17	Oct 3	123
Grand Canyon National Park Airport	6,606	Jun 17	Jul 1	Sep 24	97
Grand Canyon Visitor Center	7,083	May 2	May 18	Oct 27	177
Green Valley	2,900	Feb 25	Mar 18	Nov 27	276
Greer	8,275	Jun 5	Jun 20	Sep 29	113
Happy Jack Ranger Station	7,480	Jun 1	Jun 13	Oct 3	124
Heber (black Mesa) Ranger Station	6,590	May 23	Jun 6	Oct 5	135
Holbrook	5,085	Apr 22	May 7	Oct 24	184
Jerome	4,950	Mar 26	Apr 19	Nov 25	242
Kartchner Caverns	4,690	Mar 20	Apr 11	Nov 15	237
Keams Canyon	6,205	May 16	Jun 5	Oct 10	147
Kingman Mohave County Airport	3,420	Apr 2	Apr 21	Nov 11	220
Kitt Peak	6,790	Apr 26	May 17	Nov 4	195
Kofa Mine	1,775	Jan 11	Feb 16	Jan 9	365
Lake Havasu City	449	Jan 5	Feb 3	Dec 29	365
Laveen 3 SSE	1,135	Jan 14	Feb 12	Dec 22	343
Lees Ferry	3,210	Mar 5	Mar 26	Nov 19	257
Litchfield Park	1,040	Jan 7	Feb 5	Dec 24	351
Lukachukai	6,520	May 3	May 22	Oct 17	163
Maricopa 4 N	1,160	Feb 23	Mar 15	Nov 24	274
Mc Nary 2N	7,340	May 20	Jun 4	Oct 11	142
Mc Neal	4,170	Apr 6	Apr 24	Nov 10	215
Meadview 1W	2,938	Mar 5	Mar 28	Nov 28	265
Meteor Crater	5,535	Apr 30	May 26	Oct 23	174
Miami	3,560	Feb 24	Mar 18	Dec 1	279
Montezuma Castle National Monument	3,180	Apr 16	May 2	Oct 30	196
Monument Valley	5,501	Apr 10	Apr 30	Nov 1	205
Mormon Flat	1,705	Jan 29	Feb 23	Dec 24	334
Mount Lemmon Willow Canyon	7,027	Apr 1	Apr 21	Nov 19	229
Mund's Park	6,470	Jun 10	Jun 27	Sep 27	106
Natural Brg	4,608	Apr 9	May 10	Nov 10	211
Nogales 6 N	3,461	Apr 16	May 4	Nov 2	199
Nogales Intl Airport	3,932	Mar 20	Apr 13	Nov 17	239
Oak Creek Canyon	5,118	Apr 14	May 4	Nov 5	204
Oracle 2 SE	4,510	Mar 23	Apr 16	Nov 22	242
Oracle State Park	4,595	Mar 29	Apr 29	Nov 13	225
Organ Pipe Cactus National Monument	1,678	Feb 4	Mar 3	Dec 15	314
Page	4,270	Mar 27	Apr 16	Nov 9	226
Page Municipal Airport	4,310	Mar 7	Mar 31	Nov 15	250
Painted Desert National Park	5,760	May 1	May 16	Oct 20	169
Painted Rock Dam	568	Jan 21	Feb 18	Dec 15	327
Paradise	5,460	Apr 21	May 8	Oct 27	188
Parker	420	Jan 12	Feb 15	Dec 19	338
Payson	4,850	Apr 29	May 20	Oct 24	176
Pearce - Sunsites	4,350	Apr 14	Apr 30	Nov 2	200
Petrified Forest National Park	5,446	May 4	May 21	Oct 16	162
Phantom Rch	2,530	Feb 9	Mar 4	Dec 5	295
Phoenix Deer Valley Municipal Airport	1,455	Jan 8	Feb 12	Dec 25	354
Phoenix Sky Harbor Intl Airport	1,107	Jan 5	Jan 22	Jan 3	365
Picacho 8 SE	1,981	Feb 6	Mar 5	Dec 9	308
Pinetop 2E	7,200	May 22	Jun 4	Oct 6	138
Pinnacle Peak	2,565	Jan 27	Mar 5	Dec 21	330
Pipe Spring National Monument	4,920	May 1	May 18	Oct 19	168
Pleasant Valley	5,183	May 6	May 28	Oct 20	165
Portal 4 SW	5,390	May 3	May 16	Oct 25	174
Prescott	5,205	Apr 30	May 15	Oct 20	172
Prescott Love Field	5,042	Apr 20	May 7	Oct 27	188
Punkin Center	2,325	Mar 7	Mar 27	Nov 20	255
Quartzsite	875	Jan 28	Feb 24	Dec 6	315
Robson Rch	1,495	Feb 7	Mar 4	Dec 3	298
Roosevelt 1 S	2,605	Jan 17	Feb 18	Dec 25	342
Safford Agricultural Center	2,954	Mar 25	Apr 14	Nov 9	228
Safford Municipal Airport	3,176	Mar 8	Mar 27	Nov 20	254
Saguaro National Park	3,080	Jan 26	Feb 25	Dec 16	326
Saint Johns	5,790	May 2	May 17	Oct 14	164
San Carlos Reservoir	2,532	Mar 13	Apr 6	Nov 19	247
San Manuel	3,420	Feb 4	Mar 2	Dec 8	306
San Simon	3,580	Apr 16	May 4	Nov 2	198
Sanders	5,853	May 22	Jun 10	Oct 8	138
Santa Rita Experiment Range	4,300	Feb 25	Mar 29	Dec 5	282
Sasabe	3,590	Mar 21	Apr 14	Nov 20	246
Scottsdale Municipal Airport	1,473	Jan 6	Feb 7	Dec 26	353
Sedona	4,220	Apr 1	Apr 19	Nov 17	229
Seligman	5,250	May 10	May 29	Oct 15	154
Show Low Airport	6,411	May 5	May 20	Oct 15	162
Sierra Vista	4,606	Apr 5	Apr 21	Nov 9	216
Snowflake	5,642	May 11	May 31	Oct 10	149
Sonoita	4,895	Mar 28	Apr 21	Nov 21	237
South Phoenix	1,155	Jan 21	Feb 20	Dec 16	331
Springerville	6,998	Jun 1	Jun 20	Sep 26	114
St Johns Industrial Airport	5,733	May 3	May 19	Oct 10	160
Stewart Mountain Dam	1,422	Feb 13	Mar 8	Dec 5	295
Sunrise Mountain	9,370	Jun 18	Jun 30	Sep 18	91
Sunset Crater National Monument	6,980	Jun 16	Jun 29	Sep 19	94
Superior	2,860	Jan 18	Mar 1	Dec 28	342
Tacna 3 NE	324	Feb 13	Mar 5	Dec 1	288
Teec Nos Pos	5,290	Apr 11	May 2	Nov 1	200
Tempe Asu	1,167	Feb 13	Mar 9	Dec 5	298
Temple Bar	1,280	Feb 4	Feb 25	Dec 10	309
Tohono Chul	2,527	Feb 26	Mar 18	Dec 4	279
Tombstone	4,659	Mar 4	Mar 31	Nov 29	264
Tuba City	4,988	Apr 16	May 4	Oct 28	193
Tucson 11 W	2,733	Feb 8	Mar 8	Dec 10	303
Tucson 17 NW	2,561	Feb 23	Mar 22	Dec 6	287
Tucson Camp Ave Experiment	2,330	Feb 20	Mar 11	Nov 27	280
Tucson Intl Airport	2,549	Feb 5	Mar 2	Dec 9	307
Tucson U Of A #1	2,315	Feb 11	Mar 7	Dec 2	293
Tucson WFO	2,435	Jan 20	Feb 18	Dec 17	332
Tumacacori National Monument	3,267	Apr 5	Apr 25	Nov 10	217
Tuzigoot	3,470	Mar 30	Apr 21	Nov 10	223
Twin Arrows	5,815	Apr 14	May 4	Oct 25	192
Wahweap	3,730	Mar 14	Apr 7	Nov 16	244
Walnut Canyon National Monument	6,695	May 13	May 30	Oct 6	145
Walnut Creek	5,090	May 24	Jun 11	Oct 7	135
Wickenburg	2,095	Mar 7	Apr 8	Nov 20	254
Wikieup	2,010	Mar 19	Apr 22	Nov 23	246
Willcox	4,170	Apr 9	Apr 29	Oct 31	204
Williams	6,909	May 22	Jun 10	Oct 5	135
Williams 35 NNW	5,990	May 9	May 27	Oct 19	161
Willow Beach	740	Jan 7	Feb 1	Dec 29	358
Window Rock Airport	6,739	May 29	Jun 10	Sep 28	121
Winslow Municipal Airport	4,886	Apr 27	May 14	Oct 18	174
Wittmann 1SE	1,683	Feb 5	Mar 3	Dec 11	306
Wupatki National Monument	4,908	Apr 7	Apr 30	Nov 3	206
Youngtown	1,135	Jan 20	Feb 18	Dec 15	331
Yucca 1 NNE	1,950	Feb 18	Mar 16	Dec 2	288
Yuma 27 ENE	620	Jan 11	Feb 14	Dec 21	347
Yuma McAs	213	Rare	Rare	Rare	365
Yuma Proving Ground	324	Jan 4	Feb 9	Dec 25	361
Yuma Quartermaster Depot	160	Jan 8	Feb 19	Dec 28	362

Frequently asked questions

When is the last frost in Arizona?

The median last spring frost (32°F) across Arizona's NOAA weather stations is March 30, based on 1991–2020 climate normals. It ranges from January 4 at Bullhead City to June 23 at Flagstaff 4 SW. For a safer planting date, use the 10%-risk date; the state median for that is April 19.

When is the first frost in Arizona?

The median first fall frost across Arizona's stations is November 13. The earliest median first frost is September 15 at Flagstaff 4 SW, and the latest is January 9 at Kofa Mine.

How long is the growing season in Arizona?

The median frost-free season is 226 days across Arizona's stations, from 81 days at Flagstaff 4 SW to 365 days at Phoenix Sky Harbor Intl Airport.

When should I plant tomatoes in Arizona?

Plant tomatoes outdoors after your local last frost, ideally after the 10%-risk date when nights stay above 50°F. At a typical Arizona station that means starting seeds indoors 6–8 weeks before March 30 and transplanting from about April 19. Check your ZIP code, because dates vary by weeks across the state.

Does it frost everywhere in Arizona?

No. At 1 station in Arizona, 32°F nights were too rare in 1991–2020 to compute an average frost date, so those places are frost-free in most years.

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.