Arizona frost dates: Last spring and first autumn frost at every NOAA station, 1991-2020
Across Arizona's 174 NOAA stations with frost dates, the median last spring frost (32°F) runs from January 4 in Bullhead City to June 23 in Flagstaff (4 mi SW); for half of its places it comes after March 20.
- Typical last spring frost
- March 20median of 96 places
- Typical first autumn frost
- November 19median of 96 places
- Earliest last frost
- January 4Bullhead City
- Latest last frost
- June 23Flagstaff (4 mi SW)
When is the last frost in Arizona, town by town?
Each date is NOAA's: "after March 20 in half of years" means the last 32°F night of spring came after March 20 in half of the years 1991-2020. By the 1-in-10 date, the last frost has passed in nine years out of ten.
Find your town in the list, or look up a ZIP code for the stations nearest it.
| Place or station | Last frost (median) | 1 in 10 after | First frost (median) | 1 in 10 before | Growing season | Zone |
|---|---|---|---|---|---|---|
| Bullhead City | January 4 | February 5 | December 23 | December 1 | 356 days | 10a |
| Ehrenberg2 mi E | January 4 | February 10 | December 19 | December 5 | 347 days | – |
| Yuma Proving Ground | January 4 | February 9 | December 25 | December 3 | 361 days | 10a |
| Lake Havasu City * | January 5 | February 3 | December 29 | December 9 | 365 days | 10a |
| Phoenix *Phoenix Sky Harbor International Airport | January 5 | January 22 | January 3 | December 18 | 365 days | 10a |
| Fountain Hills | January 6 | February 11 | December 28 | December 4 | 356 days | – |
| ScottsdaleScottsdale Municipal Airport | January 6 | February 7 | December 26 | December 4 | 353 days | 10a |
| Litchfield Park | January 7 | February 5 | December 24 | December 6 | 351 days | 9b |
| Willow Beach | January 7 | February 1 | December 29 | December 10 | 358 days | – |
| Phoenix Deer Valley Municipal Airport | January 8 | February 12 | December 25 | December 5 | 354 days | 10a |
| Yuma Quartermaster Depot | January 8 | February 19 | December 28 | December 11 | 362 days | – |
| Ajo | January 10 | February 15 | December 21 | November 25 | 347 days | – |
| Kofa Mine * | January 11 | February 16 | January 9 | December 14 | 365 days | 10a |
| Yuma (27 mi ENE) | January 11 | February 14 | December 21 | December 1 | 347 days | – |
| Parker | January 12 | February 15 | December 19 | December 4 | 338 days | – |
| Laveen (3 mi SSE) | January 14 | February 12 | December 22 | December 1 | 343 days | 9b |
| Castle Hot Springs | January 15 | February 21 | December 22 | November 29 | 341 days | 9b |
| Roosevelt1 mi S | January 17 | February 18 | December 25 | December 5 | 342 days | 9b |
| Superior | January 18 | March 1 | December 28 | December 1 | 342 days | – |
| Tucson Weather Office | January 20 | February 18 | December 17 | November 28 | 332 days | – |
| Youngtown | January 20 | February 18 | December 15 | November 28 | 331 days | 9b |
| Painted Rock Dam | January 21 | February 18 | December 15 | November 27 | 327 days | – |
| South Phoenix | January 21 | February 20 | December 16 | November 29 | 331 days | 9b |
| Gila Bend2 mi SE | January 23 | February 19 | December 11 | November 24 | 323 days | 9b |
| DatelandDateland Whitewing Ranch | January 25 | February 25 | December 13 | November 29 | 324 days | – |
| Saguaro National Park | January 26 | February 25 | December 16 | November 26 | 326 days | – |
| Pinnacle Peak | January 27 | March 5 | December 21 | November 28 | 330 days | – |
| Quartzsite | January 28 | February 24 | December 6 | November 22 | 315 days | 9b |
| Mormon Flat | January 29 | February 23 | December 24 | December 3 | 334 days | – |
| Florence | January 30 | February 24 | December 12 | November 22 | 319 days | – |
| ChandlerChandler Heights | February 1 | February 27 | December 11 | November 23 | 315 days | – |
| MesaEast Mesa | February 1 | February 28 | December 10 | November 22 | 312 days | 9b |
| Carefree | February 4 | March 9 | December 16 | November 24 | 313 days | 9b |
| Organ Pipe Cactus National Monument | February 4 | March 3 | December 15 | November 26 | 314 days | 9b |
| San Manuel | February 4 | March 2 | December 8 | November 20 | 306 days | – |
| Temple Bar | February 4 | February 25 | December 10 | November 27 | 309 days | – |
| Casa Grande | February 5 | February 28 | December 6 | November 18 | 305 days | – |
| TucsonTucson International Airport | February 5 | March 2 | December 9 | November 21 | 307 days | 9b |
| Wittmann1 mi SE | February 5 | March 3 | December 11 | November 20 | 306 days | 9a |
| Picacho8 mi SE | February 6 | March 5 | December 9 | November 22 | 308 days | 9b |
| Robson Ranch | February 7 | March 4 | December 3 | November 17 | 298 days | – |
| Tucson (11 mi W) | February 8 | March 8 | December 10 | November 22 | 303 days | – |
| Phantom Ranch | February 9 | March 4 | December 5 | November 21 | 295 days | 9b |
| Apache Junction5 mi NE | February 11 | March 7 | December 10 | November 19 | 304 days | 9b |
| Tucson U Of A #1 | February 11 | March 7 | December 2 | November 16 | 293 days | 9a |
| Stewart Mountain Dam | February 13 | March 8 | December 5 | November 18 | 295 days | – |
| Tacna3 mi NE | February 13 | March 5 | December 1 | November 14 | 288 days | 9a |
| TempeTempe ASU | February 13 | March 9 | December 5 | November 18 | 298 days | 9b |
| CoolidgeCasa Grande National Monument | February 17 | March 8 | November 29 | November 12 | 284 days | – |
| Bouse | February 18 | March 12 | November 28 | November 12 | 284 days | 9a |
| Yucca1 mi NNE | February 18 | March 16 | December 2 | November 16 | 288 days | 9b |
| Tucson Camp Ave Experiment | February 20 | March 11 | November 27 | November 10 | 280 days | 9a |
| Maricopa4 mi N | February 23 | March 15 | November 24 | November 10 | 274 days | 9a |
| Tucson (17 mi NW) | February 23 | March 22 | December 6 | November 18 | 287 days | – |
| Eloy4 mi NE | February 24 | March 18 | November 28 | November 11 | 273 days | – |
| Miami | February 24 | March 18 | December 1 | November 15 | 279 days | – |
| Green Valley | February 25 | March 18 | November 27 | November 12 | 276 days | 9a |
| Santa Rita Experiment Range | February 25 | March 29 | December 5 | November 16 | 282 days | – |
| Casas AdobesTohono Chul | February 26 | March 18 | December 4 | November 17 | 279 days | – |
| Clifton | February 26 | March 15 | November 23 | November 10 | 268 days | – |
| Arizona City | February 28 | March 14 | November 21 | November 5 | 266 days | – |
| Alamo Dam | March 4 | March 31 | November 23 | November 10 | 261 days | 9a |
| Tombstone | March 4 | March 31 | November 29 | November 12 | 264 days | 9a |
| Lees Ferry | March 5 | March 26 | November 19 | November 4 | 257 days | – |
| Meadview1 mi W | March 5 | March 28 | November 28 | November 14 | 265 days | – |
| Beaver Dam | March 7 | April 10 | November 19 | November 1 | 251 days | 8b |
| PagePage Municipal Airport | March 7 | March 31 | November 15 | November 2 | 250 days | 8b |
| Punkin Center | March 7 | March 27 | November 20 | November 3 | 255 days | – |
| Wickenburg | March 7 | April 8 | November 20 | November 4 | 254 days | 8b |
| SaffordSafford Municipal Airport | March 8 | March 27 | November 20 | November 4 | 254 days | 8b |
| GlobeGlobe #3 | March 11 | March 29 | November 21 | November 6 | 253 days | – |
| San CarlosSan Carlos Reservoir | March 13 | April 6 | November 19 | November 3 | 247 days | – |
| Wahweap | March 14 | April 7 | November 16 | November 2 | 244 days | – |
| Fort Huachuca Pioneer Airfield | March 16 | April 12 | November 21 | November 3 | 246 days | – |
| Aguila | March 17 | April 12 | November 19 | November 5 | 243 days | – |
| Douglas station | March 18 | April 12 | November 13 | October 27 | 235 days | – |
| Wikieup | March 19 | April 22 | November 23 | November 4 | 246 days | – |
| Kartchner Caverns | March 20 | April 11 | November 15 | November 1 | 237 days | – |
| NogalesNogales International Airport | March 20 | April 13 | November 17 | October 30 | 239 days | 8b |
| Sasabe | March 21 | April 14 | November 20 | November 1 | 246 days | – |
| Oracle2 mi SE | March 23 | April 16 | November 22 | November 2 | 242 days | 8b |
| Safford Agricultural Center | March 25 | April 14 | November 9 | October 23 | 228 days | – |
| Jerome | March 26 | April 19 | November 25 | November 4 | 242 days | 9a |
| Anvil Ranch | March 27 | April 18 | November 9 | October 25 | 226 days | – |
| Page station | March 27 | April 16 | November 9 | October 26 | 226 days | 8b |
| Sonoita | March 28 | April 21 | November 21 | November 5 | 237 days | – |
| Oracle State Park | March 29 | April 29 | November 13 | October 26 | 225 days | – |
| CottonwoodTuzigoot | March 30 | April 21 | November 10 | October 25 | 223 days | 8b |
| Bisbee1 mi WNW | April 1 | April 20 | November 10 | October 25 | 222 days | – |
| Bowie | April 1 | April 18 | November 6 | October 21 | 217 days | 8b |
| Fort Thomas2 mi SW | April 1 | April 18 | November 6 | October 21 | 217 days | 8a |
| Mount Lemmon Willow Canyon | April 1 | April 21 | November 19 | October 30 | 229 days | – |
| Sedona | April 1 | April 19 | November 17 | October 28 | 229 days | 8b |
| CatalinaCatalina State Park | April 2 | April 18 | November 11 | October 26 | 222 days | – |
| Childs | April 2 | April 20 | November 11 | October 27 | 223 days | – |
| KingmanKingman Airport | April 2 | April 21 | November 11 | October 26 | 220 days | 8b |
| Cordes | April 5 | April 24 | November 17 | October 28 | 221 days | 8b |
| Sierra Vista | April 5 | April 21 | November 9 | October 23 | 216 days | – |
| Tumacacori National Monument | April 5 | April 25 | November 10 | October 21 | 217 days | 8b |
| McNeal | April 6 | April 24 | November 10 | October 25 | 215 days | – |
| Bagdad | April 7 | May 3 | November 12 | October 26 | 217 days | 9a |
| Coronado National Memorial | April 7 | April 27 | November 9 | October 25 | 213 days | 8b |
| Wupatki National Monument | April 7 | April 30 | November 3 | October 19 | 206 days | 8a |
| Natural Bridge | April 9 | May 10 | November 10 | October 21 | 211 days | – |
| Willcox | April 9 | April 29 | October 31 | October 20 | 204 days | 8a |
| Monument Valley | April 10 | April 30 | November 1 | October 17 | 205 days | 7b |
| DouglasDouglas Bisbee Inl Airport | April 11 | April 27 | November 2 | October 21 | 203 days | 8a |
| Teec Nos Pos | April 11 | May 2 | November 1 | October 16 | 200 days | – |
| Benson6 mi SE | April 12 | April 29 | November 1 | October 18 | 202 days | 8a |
| Oak Creek Canyon | April 14 | May 4 | November 5 | October 18 | 204 days | – |
| Pearce - Sunsites | April 14 | April 30 | November 2 | October 20 | 200 days | 8a |
| Twin Arrows | April 14 | May 4 | October 25 | October 11 | 192 days | – |
| Camp VerdeMontezuma Castle National Monument | April 16 | May 2 | October 30 | October 15 | 196 days | 8a |
| Chiricahua National Monument | April 16 | April 30 | November 8 | October 21 | 203 days | – |
| Rio RicoNogales (6 mi N) | April 16 | May 4 | November 2 | October 19 | 199 days | – |
| San Simon | April 16 | May 4 | November 2 | October 17 | 198 days | 8a |
| Tuba City | April 16 | May 4 | October 28 | October 13 | 193 days | 8a |
| Elgin5 mi S | April 18 | May 3 | November 1 | October 18 | 195 days | 8a |
| PrescottPrescott Love Field | April 20 | May 7 | October 27 | October 13 | 188 days | 8a |
| Paradise | April 21 | May 8 | October 27 | October 16 | 188 days | – |
| Holbrook | April 22 | May 7 | October 24 | October 12 | 184 days | – |
| Canelo (1 mi NW) | April 23 | May 7 | October 30 | October 17 | 188 days | – |
| Cascabel | April 24 | May 9 | October 31 | October 14 | 187 days | 8a |
| Duncan | April 24 | May 8 | October 25 | October 11 | 183 days | 8a |
| Colorado City | April 26 | May 15 | October 25 | October 11 | 180 days | – |
| Kitt Peak | April 26 | May 17 | November 4 | October 18 | 195 days | – |
| Chino Valley | April 27 | May 18 | October 24 | October 9 | 178 days | – |
| WinslowWinslow Municipal Airport | April 27 | May 14 | October 18 | October 5 | 174 days | 7a |
| Payson | April 29 | May 20 | October 24 | October 11 | 176 days | 8a |
| Meteor Crater | April 30 | May 26 | October 23 | October 1 | 174 days | – |
| Prescott station | April 30 | May 15 | October 20 | October 7 | 172 days | 7b |
| Painted Desert National Park | May 1 | May 16 | October 20 | October 6 | 169 days | – |
| Pipe Spring National Monument | May 1 | May 18 | October 19 | October 5 | 168 days | 7a |
| Grand Canyon Visitor Center | May 2 | May 18 | October 27 | October 11 | 177 days | – |
| Saint Johns station | May 2 | May 17 | October 14 | October 3 | 164 days | 7a |
| Lukachukai | May 3 | May 22 | October 17 | October 2 | 163 days | – |
| Portal (4 mi SW) | May 3 | May 16 | October 25 | October 11 | 174 days | 7b |
| St. JohnsSt Johns Industrial Airport | May 3 | May 19 | October 10 | September 30 | 160 days | 7a |
| Petrified Forest National Park | May 4 | May 21 | October 16 | October 3 | 162 days | 7a |
| Show LowShow Low Airport | May 5 | May 20 | October 15 | October 2 | 162 days | 7a |
| Canyon De Chelly | May 6 | May 31 | October 8 | September 26 | 153 days | 7a |
| Pleasant Valley | May 6 | May 28 | October 20 | October 6 | 165 days | – |
| Betatakin | May 7 | May 26 | October 15 | September 30 | 159 days | 7a |
| Williams (35 mi NNW) | May 9 | May 27 | October 19 | October 3 | 161 days | – |
| Grand Canyon E Entrance | May 10 | May 24 | October 20 | October 7 | 165 days | – |
| Seligman | May 10 | May 29 | October 15 | October 1 | 154 days | 7a |
| Snowflake | May 11 | May 31 | October 10 | September 28 | 149 days | 7a |
| Walnut Canyon National Monument | May 13 | May 30 | October 6 | September 26 | 145 days | 6b |
| Ganado | May 15 | June 1 | October 10 | September 28 | 147 days | – |
| Black River Pumps | May 16 | June 2 | October 13 | September 30 | 149 days | – |
| Keams Canyon | May 16 | June 5 | October 10 | September 29 | 147 days | – |
| Diamond M Ranch | May 17 | June 4 | October 10 | September 28 | 146 days | 7a |
| McNary (2 mi N) | May 20 | June 4 | October 11 | September 29 | 142 days | 7a |
| Pinetop (2 mi E) | May 22 | June 4 | October 6 | September 24 | 138 days | 6b |
| Sanders | May 22 | June 10 | October 8 | September 25 | 138 days | – |
| Williams | May 22 | June 10 | October 5 | September 24 | 135 days | – |
| Heber (Black Mesa) Ranger Station | May 23 | June 6 | October 5 | September 24 | 135 days | – |
| Walnut Creek | May 24 | June 11 | October 7 | September 27 | 135 days | 7b |
| Window RockWindow Rock Airport | May 29 | June 10 | September 28 | September 16 | 121 days | 6a |
| Blue RidgeBlue Ridge Ranger Station | May 31 | June 12 | October 2 | September 22 | 126 days | – |
| Grand Canyon National Park 2 | June 1 | June 17 | October 3 | September 22 | 123 days | – |
| Happy Jack Ranger Station | June 1 | June 13 | October 3 | September 22 | 124 days | – |
| Springerville | June 1 | June 20 | September 26 | September 12 | 114 days | 6a |
| Bright Angel Ranger Station | June 3 | June 19 | September 27 | September 12 | 113 days | – |
| FlagstaffFlagstaff Airport | June 4 | June 19 | September 28 | September 16 | 115 days | 6a |
| Greer | June 5 | June 20 | September 29 | September 15 | 113 days | – |
| Munds ParkMund's Park | June 10 | June 27 | September 27 | September 14 | 106 days | 6a |
| Fort Valley | June 11 | June 30 | September 25 | September 8 | 99 days | 5b |
| Alpine | June 15 | June 30 | September 21 | September 7 | 96 days | 6a |
| Sunset Crater National Monument | June 16 | June 29 | September 19 | August 31 | 94 days | 6a |
| Grand Canyon National Park Airport | June 17 | July 1 | September 24 | September 12 | 97 days | 5b |
| Sunrise Mountain | June 18 | June 30 | September 18 | September 4 | 91 days | – |
| BellemontBellemont Weather Office | June 21 | July 4 | September 17 | September 3 | 85 days | 5b |
| Flagstaff (4 mi SW) | June 23 | July 7 | September 15 | August 31 | 81 days | 5b |
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities, growing-season length); station daily lows via ACIS (zone). * A night at 32°F or colder comes there in fewer than half of years; NOAA's dates for it are shown as published. Growing season: NOAA's median number of days between the last spring and first autumn 32°F night. Zone: the USDA's plant hardiness rule applied to the station's own 1991-2020 coldest nights.