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Arizona frost dates

Across 174 NOAA climate stations in Arizona, the median last spring frost (32°F) ranges from Jan 4 at Bullhead City to Jun 23 at Flagstaff 4 Sw; the typical station sees its last frost around Mar 30 and its first fall frost around Nov 13.

“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
Aguila2,165 ftMar 17Apr 12Nov 19Nov 5243 days
Ajo1,751 ftJan 10Feb 15Dec 21Nov 25347 days
Alamo Dam1,290 ftMar 4Mar 31Nov 23Nov 10261 days
Alpine8,050 ftJun 15Jun 30Sep 21Sep 796 days
Anvil Rch2,759 ftMar 27Apr 18Nov 9Oct 25226 days
Apache Junction 5 Ne2,070 ftFeb 11Mar 7Dec 10Nov 19304 days
Arizona City1,525 ftFeb 28Mar 14Nov 21Nov 5266 days
Bagdad3,935 ftApr 7May 3Nov 12Oct 26217 days
Beaver Dam1,931 ftMar 7Apr 10Nov 19Nov 1251 days
Bellemont Wfo7,152 ftJun 21Jul 4Sep 17Sep 385 days
Benson 6SE3,690 ftApr 12Apr 29Nov 1Oct 18202 days
Betatakin7,286 ftMay 7May 26Oct 15Sep 30159 days
Bisbee 1WNW5,560 ftApr 1Apr 20Nov 10Oct 25222 days
Black Rvr Pumps6,065 ftMay 16Jun 2Oct 13Sep 30149 days
Blue Ridge Rs6,880 ftMay 31Jun 12Oct 2Sep 22126 days
Bouse925 ftFeb 18Mar 12Nov 28Nov 12284 days
Bowie3,777 ftApr 1Apr 18Nov 6Oct 21217 days
Bright Angel Rs8,000 ftJun 3Jun 19Sep 27Sep 12113 days
Bullhead City531 ftJan 4Feb 5Dec 23Dec 1356 days
Canelo 1 Nw5,010 ftApr 23May 7Oct 30Oct 17188 days
Canyon De Chelly5,610 ftMay 6May 31Oct 8Sep 26153 days
Carefree2,530 ftFeb 4Mar 9Dec 16Nov 24313 days
Casa Grande1,400 ftFeb 5Feb 28Dec 6Nov 18305 days
Casa Grande Nm1,419 ftFeb 17Mar 8Nov 29Nov 12284 days
Cascabel3,194 ftApr 24May 9Oct 31Oct 14187 days
Castle Hot Springs1,990 ftJan 15Feb 21Dec 22Nov 29341 days
Catalina Sp2,707 ftApr 2Apr 18Nov 11Oct 26222 days
Chandler Heights1,425 ftFeb 1Feb 27Dec 11Nov 23315 days
Childs2,650 ftApr 2Apr 20Nov 11Oct 27223 days
Chino Valley4,750 ftApr 27May 18Oct 24Oct 9178 days
Chiricahua Nm5,300 ftApr 16Apr 30Nov 8Oct 21203 days
Clifton3,520 ftFeb 26Mar 15Nov 23Nov 10268 days
Colorado City5,001 ftApr 26May 15Oct 25Oct 11180 days
Cordes3,771 ftApr 5Apr 24Nov 17Oct 28221 days
Coronado Nmem5,242 ftApr 7Apr 27Nov 9Oct 25213 days
Dateland Whitewing Rch520 ftJan 25Feb 25Dec 13Nov 29324 days
Diamond M Rch5,492 ftMay 17Jun 4Oct 10Sep 28146 days
Douglas4,040 ftMar 18Apr 12Nov 13Oct 27235 days
Douglas Bisbee Inl AP4,105 ftApr 11Apr 27Nov 2Oct 21203 days
Duncan3,660 ftApr 24May 8Oct 25Oct 11183 days
E Mesa1,518 ftFeb 1Feb 28Dec 10Nov 22312 days
Ehrenberg 2 E465 ftJan 4Feb 10Dec 19Dec 5347 days
Elgin 5 S4,811 ftApr 18May 3Nov 1Oct 18195 days
Eloy 4 Ne1,545 ftFeb 24Mar 18Nov 28Nov 11273 days
Flagstaff 4 Sw7,125 ftJun 23Jul 7Sep 15Aug 3181 days
Flagstaff Pulliam AP7,003 ftJun 4Jun 19Sep 28Sep 16115 days
Florence1,400 ftJan 30Feb 24Dec 12Nov 22319 days
Fountain Hills1,580 ftJan 6Feb 11Dec 28Dec 4356 days
Ft Huachuca Pioneer Airfield4,768 ftMar 16Apr 12Nov 21Nov 3246 days
Ft Thomas 2 Sw2,835 ftApr 1Apr 18Nov 6Oct 21217 days
Ft Valley7,347 ftJun 11Jun 30Sep 25Sep 899 days
Ganado6,340 ftMay 15Jun 1Oct 10Sep 28147 days
Gila Bend 2SE794 ftJan 23Feb 19Dec 11Nov 24323 days
Globe #33,660 ftMar 11Mar 29Nov 21Nov 6253 days
Grand Canyon E Entrance7,480 ftMay 10May 24Oct 20Oct 7165 days
Grand Canyon Np 26,785 ftJun 1Jun 17Oct 3Sep 22123 days
Grand Canyon Np AP6,606 ftJun 17Jul 1Sep 24Sep 1297 days
Grand Canyon Visitor Ctr7,083 ftMay 2May 18Oct 27Oct 11177 days
Green Valley2,900 ftFeb 25Mar 18Nov 27Nov 12276 days
Greer8,275 ftJun 5Jun 20Sep 29Sep 15113 days
Happy Jack Rs7,480 ftJun 1Jun 13Oct 3Sep 22124 days
Heber (Black Mesa) Rs6,590 ftMay 23Jun 6Oct 5Sep 24135 days
Holbrook5,085 ftApr 22May 7Oct 24Oct 12184 days
Jerome4,950 ftMar 26Apr 19Nov 25Nov 4242 days
Kartchner Caverns4,690 ftMar 20Apr 11Nov 15Nov 1237 days
Keams Canyon6,205 ftMay 16Jun 5Oct 10Sep 29147 days
Kingman Mohave Co AP3,420 ftApr 2Apr 21Nov 11Oct 26220 days
Kitt Peak6,790 ftApr 26May 17Nov 4Oct 18195 days
Kofa Mine1,775 ftJan 11Feb 16Jan 9Dec 14365 days
Lake Havasu City449 ftJan 5Feb 3Dec 29Dec 9365 days
Laveen 3 Sse1,135 ftJan 14Feb 12Dec 22Dec 1343 days
Lees Ferry3,210 ftMar 5Mar 26Nov 19Nov 4257 days
Litchfield Park1,040 ftJan 7Feb 5Dec 24Dec 6351 days
Lukachukai6,520 ftMay 3May 22Oct 17Oct 2163 days
Maricopa 4 N1,160 ftFeb 23Mar 15Nov 24Nov 10274 days
Mc Nary 2N7,340 ftMay 20Jun 4Oct 11Sep 29142 days
Mc Neal4,170 ftApr 6Apr 24Nov 10Oct 25215 days
Meadview 1W2,938 ftMar 5Mar 28Nov 28Nov 14265 days
Meteor Crater5,535 ftApr 30May 26Oct 23Oct 1174 days
Miami3,560 ftFeb 24Mar 18Dec 1Nov 15279 days
Montezuma Castle Nm3,180 ftApr 16May 2Oct 30Oct 15196 days
Monument Valley5,501 ftApr 10Apr 30Nov 1Oct 17205 days
Mormon Flat1,705 ftJan 29Feb 23Dec 24Dec 3334 days
Mt Lemmon Willow Canyon7,027 ftApr 1Apr 21Nov 19Oct 30229 days
Mund'S Park6,470 ftJun 10Jun 27Sep 27Sep 14106 days
Natural Brg4,608 ftApr 9May 10Nov 10Oct 21211 days
Nogales 6 N3,461 ftApr 16May 4Nov 2Oct 19199 days
Nogales Intl AP3,932 ftMar 20Apr 13Nov 17Oct 30239 days
Oak Creek Canyon5,118 ftApr 14May 4Nov 5Oct 18204 days
Oracle 2 Se4,510 ftMar 23Apr 16Nov 22Nov 2242 days
Oracle Sp4,595 ftMar 29Apr 29Nov 13Oct 26225 days
Organ Pipe Cactus Nm1,678 ftFeb 4Mar 3Dec 15Nov 26314 days
Page4,270 ftMar 27Apr 16Nov 9Oct 26226 days
Page Muni AP4,310 ftMar 7Mar 31Nov 15Nov 2250 days
Painted Desert Np5,760 ftMay 1May 16Oct 20Oct 6169 days
Painted Rock Dam568 ftJan 21Feb 18Dec 15Nov 27327 days
Paradise5,460 ftApr 21May 8Oct 27Oct 16188 days
Parker420 ftJan 12Feb 15Dec 19Dec 4338 days
Payson4,850 ftApr 29May 20Oct 24Oct 11176 days
Pearce - Sunsites4,350 ftApr 14Apr 30Nov 2Oct 20200 days
Petrified Forest Np5,446 ftMay 4May 21Oct 16Oct 3162 days
Phantom Rch2,530 ftFeb 9Mar 4Dec 5Nov 21295 days
Phoenix Deer Valley Muni AP1,455 ftJan 8Feb 12Dec 25Dec 5354 days
Phoenix Sky Harbor Intl AP1,107 ftJan 5Jan 22Jan 3Dec 18365 days
Picacho 8 Se1,981 ftFeb 6Mar 5Dec 9Nov 22308 days
Pinetop 2E7,200 ftMay 22Jun 4Oct 6Sep 24138 days
Pinnacle Peak2,565 ftJan 27Mar 5Dec 21Nov 28330 days
Pipe Spring Nm4,920 ftMay 1May 18Oct 19Oct 5168 days
Pleasant Valley5,183 ftMay 6May 28Oct 20Oct 6165 days
Portal 4 Sw5,390 ftMay 3May 16Oct 25Oct 11174 days
Prescott5,205 ftApr 30May 15Oct 20Oct 7172 days
Prescott Love Fld5,042 ftApr 20May 7Oct 27Oct 13188 days
Punkin Ctr2,325 ftMar 7Mar 27Nov 20Nov 3255 days
Quartzsite875 ftJan 28Feb 24Dec 6Nov 22315 days
Robson Rch1,495 ftFeb 7Mar 4Dec 3Nov 17298 days
Roosevelt 1 S2,605 ftJan 17Feb 18Dec 25Dec 5342 days
Safford Ag Ctr2,954 ftMar 25Apr 14Nov 9Oct 23228 days
Safford Muni AP3,176 ftMar 8Mar 27Nov 20Nov 4254 days
Saguaro Np3,080 ftJan 26Feb 25Dec 16Nov 26326 days
Saint Johns5,790 ftMay 2May 17Oct 14Oct 3164 days
San Carlos Reservoir2,532 ftMar 13Apr 6Nov 19Nov 3247 days
San Manuel3,420 ftFeb 4Mar 2Dec 8Nov 20306 days
San Simon3,580 ftApr 16May 4Nov 2Oct 17198 days
Sanders5,853 ftMay 22Jun 10Oct 8Sep 25138 days
Santa Rita Exp Range4,300 ftFeb 25Mar 29Dec 5Nov 16282 days
Sasabe3,590 ftMar 21Apr 14Nov 20Nov 1246 days
Scottsdale Muni AP1,473 ftJan 6Feb 7Dec 26Dec 4353 days
Sedona4,220 ftApr 1Apr 19Nov 17Oct 28229 days
Seligman5,250 ftMay 10May 29Oct 15Oct 1154 days
Show Low AP6,411 ftMay 5May 20Oct 15Oct 2162 days
Sierra Vista4,606 ftApr 5Apr 21Nov 9Oct 23216 days
Snowflake5,642 ftMay 11May 31Oct 10Sep 28149 days
Sonoita4,895 ftMar 28Apr 21Nov 21Nov 5237 days
South Phoenix1,155 ftJan 21Feb 20Dec 16Nov 29331 days
Springerville6,998 ftJun 1Jun 20Sep 26Sep 12114 days
St Johns Industrial AP5,733 ftMay 3May 19Oct 10Sep 30160 days
Stewart Mtn Dam1,422 ftFeb 13Mar 8Dec 5Nov 18295 days
Sunrise Mtn9,370 ftJun 18Jun 30Sep 18Sep 491 days
Sunset Crater Nm6,980 ftJun 16Jun 29Sep 19Aug 3194 days
Superior2,860 ftJan 18Mar 1Dec 28Dec 1342 days
Tacna 3 Ne324 ftFeb 13Mar 5Dec 1Nov 14288 days
Teec Nos Pos5,290 ftApr 11May 2Nov 1Oct 16200 days
Tempe Asu1,167 ftFeb 13Mar 9Dec 5Nov 18298 days
Temple Bar1,280 ftFeb 4Feb 25Dec 10Nov 27309 days
Tohono Chul2,527 ftFeb 26Mar 18Dec 4Nov 17279 days
Tombstone4,659 ftMar 4Mar 31Nov 29Nov 12264 days
Tuba City4,988 ftApr 16May 4Oct 28Oct 13193 days
Tucson 11 W2,733 ftFeb 8Mar 8Dec 10Nov 22303 days
Tucson 17 Nw2,561 ftFeb 23Mar 22Dec 6Nov 18287 days
Tucson Camp Ave Exp2,330 ftFeb 20Mar 11Nov 27Nov 10280 days
Tucson Intl AP2,549 ftFeb 5Mar 2Dec 9Nov 21307 days
Tucson U Of A #12,315 ftFeb 11Mar 7Dec 2Nov 16293 days
Tucson Wfo2,435 ftJan 20Feb 18Dec 17Nov 28332 days
Tumacacori Nm3,267 ftApr 5Apr 25Nov 10Oct 21217 days
Tuzigoot3,470 ftMar 30Apr 21Nov 10Oct 25223 days
Twin Arrows5,815 ftApr 14May 4Oct 25Oct 11192 days
Wahweap3,730 ftMar 14Apr 7Nov 16Nov 2244 days
Walnut Canyon Nm6,695 ftMay 13May 30Oct 6Sep 26145 days
Walnut Creek5,090 ftMay 24Jun 11Oct 7Sep 27135 days
Wickenburg2,095 ftMar 7Apr 8Nov 20Nov 4254 days
Wikieup2,010 ftMar 19Apr 22Nov 23Nov 4246 days
Willcox4,170 ftApr 9Apr 29Oct 31Oct 20204 days
Williams6,909 ftMay 22Jun 10Oct 5Sep 24135 days
Williams 35 Nnw5,990 ftMay 9May 27Oct 19Oct 3161 days
Willow Beach740 ftJan 7Feb 1Dec 29Dec 10358 days
Window Rock AP6,739 ftMay 29Jun 10Sep 28Sep 16121 days
Winslow Muni AP4,886 ftApr 27May 14Oct 18Oct 5174 days
Wittmann 1SE1,683 ftFeb 5Mar 3Dec 11Nov 20306 days
Wupatki Nm4,908 ftApr 7Apr 30Nov 3Oct 19206 days
Youngtown1,135 ftJan 20Feb 18Dec 15Nov 28331 days
Yucca 1 Nne1,950 ftFeb 18Mar 16Dec 2Nov 16288 days
Yuma 27 Ene620 ftJan 11Feb 14Dec 21Dec 1347 days
Yuma Mcas213 ftRarely freezes (32°F in 8% of years)
Yuma Proving Ground324 ftJan 4Feb 9Dec 25Dec 3361 days
Yuma Quartermaster Depot160 ftJan 8Feb 19Dec 28Dec 11362 days
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