Arizona frost dates
Across 171 weather stations in Arizona, the median last spring frost runs from Jan 4 in Bullhead City to Jun 23 in Flagstaff, and the first fall frost from Sep 15 to Dec 29.
Arizona at a glance
- Weather stations
- 171
- Earliest last frost
- Jan 4 Bullhead City
- Latest last frost
- Jun 23 Flagstaff
- Longest season
- 362 days Yuma Quartermaster Depot
- Typical season
- about 225 frost-free days
- Hardiness zones
- Zones 5b to 10a
Frost dates by weather station
| Weather station | Last spring frost | First fall frost | Frost-free days | Zone |
|---|---|---|---|---|
| Aguila | Mar 17 | Nov 19 | 243 | 9a |
| Ajo | Jan 10 | Dec 21 | 347 | 9b |
| Alamo Dam | Mar 4 | Nov 23 | 261 | 9a |
| Alpine | Jun 15 | Sep 21 | 96 | 6b |
| Anvil Ranch | Mar 27 | Nov 9 | 226 | 8b |
| Apache Junction | Feb 11 | Dec 10 | 304 | 9b |
| Arizona City | Feb 28 | Nov 21 | 266 | 9a |
| Bagdad | Apr 7 | Nov 12 | 217 | 9a |
| Beaver Dam | Mar 7 | Nov 19 | 251 | 9a |
| Bellemont | Jun 21 | Sep 17 | 85 | 5b |
| Benson | Apr 12 | Nov 1 | 202 | 8b |
| Betatakin | May 7 | Oct 15 | 159 | 7a |
| Bisbee | Apr 1 | Nov 10 | 222 | 8b |
| Black River Pumps | May 16 | Oct 13 | 149 | 7b |
| Blue Ridge Ranger Station | May 31 | Oct 2 | 126 | 7a |
| Bouse | Feb 18 | Nov 28 | 284 | 9a |
| Bowie | Apr 1 | Nov 6 | 217 | 8b |
| Bright Angel Ranger Station | Jun 3 | Sep 27 | 113 | 6b |
| Bullhead City | Jan 4 | Dec 23 | 356 | 10a |
| Canelo | Apr 23 | Oct 30 | 188 | 8a |
| Canyon De Chelly | May 6 | Oct 8 | 153 | 7a |
| Carefree | Feb 4 | Dec 16 | 313 | 9b |
| Casa Grande | Feb 5 | Dec 6 | 305 | 9a |
| Casa Grande National Monument | Feb 17 | Nov 29 | 284 | 9a |
| Cascabel | Apr 24 | Oct 31 | 187 | 8b |
| Castle Hot Springs | Jan 15 | Dec 22 | 341 | 9b |
| Catalina State Park | Apr 2 | Nov 11 | 222 | 9a |
| Chandler Heights | Feb 1 | Dec 11 | 315 | 9b |
| Childs | Apr 2 | Nov 11 | 223 | 8b |
| Chino Valley | Apr 27 | Oct 24 | 178 | 8a |
| Chiricahua National Monument | Apr 16 | Nov 8 | 203 | 8a |
| Clifton | Feb 26 | Nov 23 | 268 | 8b |
| Colorado City | Apr 26 | Oct 25 | 180 | 7a |
| Cordes | Apr 5 | Nov 17 | 221 | 8b |
| Coronado National Memorial | Apr 7 | Nov 9 | 213 | 8b |
| Dateland Whitewing Ranch | Jan 25 | Dec 13 | 324 | 9b |
| Diamond M Ranch | May 17 | Oct 10 | 146 | 8a |
| Douglas | Mar 18 | Nov 13 | 235 | 8a |
| Douglas Bisbee Inl Airport | Apr 11 | Nov 2 | 203 | 8a |
| Duncan | Apr 24 | Oct 25 | 183 | 8a |
| East Mesa | Feb 1 | Dec 10 | 312 | 9b |
| Ehrenberg | Jan 4 | Dec 19 | 347 | 9b |
| Elgin | Apr 18 | Nov 1 | 195 | 8a |
| Eloy | Feb 24 | Nov 28 | 273 | 9a |
| Flagstaff | Jun 23 | Sep 15 | 81 | 5b |
| Flagstaff Pulliam Airport | Jun 4 | Sep 28 | 115 | 6a |
| Florence | Jan 30 | Dec 12 | 319 | 9a |
| Fort Huachuca Pioneer Airfield | Mar 16 | Nov 21 | 246 | 8b |
| Fort Thomas | Apr 1 | Nov 6 | 217 | 8b |
| Fort Valley | Jun 11 | Sep 25 | 99 | 5b |
| Fountain Hills | Jan 6 | Dec 28 | 356 | 9b |
| Ganado | May 15 | Oct 10 | 147 | 6b |
| Gila Bend | Jan 23 | Dec 11 | 323 | 9b |
| Globe | Mar 11 | Nov 21 | 253 | 9a |
| Grand Canyon E Entrance | May 10 | Oct 20 | 165 | 7a |
| Grand Canyon National Park | Jun 1 | Oct 3 | 123 | 7a |
| Grand Canyon National Park Airport | Jun 17 | Sep 24 | 97 | 7a |
| Grand Canyon Visitor Center | May 2 | Oct 27 | 177 | 7a |
| Green Valley | Feb 25 | Nov 27 | 276 | 9a |
| Greer | Jun 5 | Sep 29 | 113 | 6a |
| Happy Jack Ranger Station | Jun 1 | Oct 3 | 124 | 6b |
| Heber (black Mesa) Ranger Station | May 23 | Oct 5 | 135 | 6b |
| Holbrook | Apr 22 | Oct 24 | 184 | 7a |
| Jerome | Mar 26 | Nov 25 | 242 | 8b |
| Kartchner Caverns | Mar 20 | Nov 15 | 237 | 8b |
| Keams Canyon | May 16 | Oct 10 | 147 | 6b |
| Kingman Mohave County Airport | Apr 2 | Nov 11 | 220 | 8b |
| Kitt Peak | Apr 26 | Nov 4 | 195 | 9a |
| Laveen | Jan 14 | Dec 22 | 343 | 10a |
| Lees Ferry | Mar 5 | Nov 19 | 257 | 7b |
| Litchfield Park | Jan 7 | Dec 24 | 351 | 9b |
| Lukachukai | May 3 | Oct 17 | 163 | 7a |
| Maricopa | Feb 23 | Nov 24 | 274 | 9b |
| McNary | May 20 | Oct 11 | 142 | 6b |
| McNeal | Apr 6 | Nov 10 | 215 | 8b |
| Meadview | Mar 5 | Nov 28 | 265 | 9a |
| Meteor Crater | Apr 30 | Oct 23 | 174 | 7a |
| Miami | Feb 24 | Dec 1 | 279 | 9a |
| Montezuma Castle National Monument | Apr 16 | Oct 30 | 196 | 8b |
| Monument Valley | Apr 10 | Nov 1 | 205 | 8a |
| Mormon Flat | Jan 29 | Dec 24 | 334 | 9b |
| Mount Lemmon Willow Canyon | Apr 1 | Nov 19 | 229 | 8b |
| Mund's Park | Jun 10 | Sep 27 | 106 | 7a |
| Natural Bridge | Apr 9 | Nov 10 | 211 | 8a |
| Nogales | Apr 16 | Nov 2 | 199 | 8b |
| Nogales International Airport | Mar 20 | Nov 17 | 239 | 8b |
| Oak Creek Canyon | Apr 14 | Nov 5 | 204 | 7a |
| Oracle | Mar 23 | Nov 22 | 242 | 9a |
| Oracle State Park | Mar 29 | Nov 13 | 225 | 9a |
| Organ Pipe Cactus National Monument | Feb 4 | Dec 15 | 314 | 9b |
| Page | Mar 27 | Nov 9 | 226 | 7b |
| Page Municipal Airport | Mar 7 | Nov 15 | 250 | 7b |
| Painted Desert National Park | May 1 | Oct 20 | 169 | 7a |
| Painted Rock Dam | Jan 21 | Dec 15 | 327 | 9b |
| Paradise | Apr 21 | Oct 27 | 188 | 8a |
| Parker | Jan 12 | Dec 19 | 338 | 9b |
| Payson | Apr 29 | Oct 24 | 176 | 8b |
| Pearce - Sunsites | Apr 14 | Nov 2 | 200 | 8b |
| Petrified Forest National Park | May 4 | Oct 16 | 162 | 7a |
| Phantom Ranch | Feb 9 | Dec 5 | 295 | 7a |
| Phoenix Deer Valley Municipal Airport | Jan 8 | Dec 25 | 354 | 10a |
| Picacho | Feb 6 | Dec 9 | 308 | 9a |
| Pinetop | May 22 | Oct 6 | 138 | 6b |
| Pinnacle Peak | Jan 27 | Dec 21 | 330 | 10a |
| Pipe Spring National Monument | May 1 | Oct 19 | 168 | 7a |
| Pleasant Valley | May 6 | Oct 20 | 165 | 8a |
| Portal | May 3 | Oct 25 | 174 | 8a |
| Prescott | Apr 30 | Oct 20 | 172 | 7b |
| Prescott Love Field | Apr 20 | Oct 27 | 188 | 7b |
| Punkin Center | Mar 7 | Nov 20 | 255 | 9a |
| Quartzsite | Jan 28 | Dec 6 | 315 | 9a |
| Robson Ranch | Feb 7 | Dec 3 | 298 | 9a |
| Roosevelt | Jan 17 | Dec 25 | 342 | 9b |
| Safford Ag Center | Mar 25 | Nov 9 | 228 | 8b |
| Safford Municipal Airport | Mar 8 | Nov 20 | 254 | 8b |
| Saguaro National Park | Jan 26 | Dec 16 | 326 | 9a |
| Saint Johns | May 2 | Oct 14 | 164 | 6b |
| San Carlos Reservoir | Mar 13 | Nov 19 | 247 | 9a |
| San Manuel | Feb 4 | Dec 8 | 306 | 9a |
| San Simon | Apr 16 | Nov 2 | 198 | 8b |
| Sanders | May 22 | Oct 8 | 138 | 6b |
| Santa Rita Experiment Range | Feb 25 | Dec 5 | 282 | 9a |
| Sasabe | Mar 21 | Nov 20 | 246 | 8b |
| Scottsdale Municipal Airport | Jan 6 | Dec 26 | 353 | 10a |
| Sedona | Apr 1 | Nov 17 | 229 | 8b |
| Seligman | May 10 | Oct 15 | 154 | 7a |
| Show Low Airport | May 5 | Oct 15 | 162 | 7a |
| Sierra Vista | Apr 5 | Nov 9 | 216 | 8b |
| Snowflake | May 11 | Oct 10 | 149 | 7a |
| Sonoita | Mar 28 | Nov 21 | 237 | 8a |
| South Phoenix | Jan 21 | Dec 16 | 331 | 10a |
| Springerville | Jun 1 | Sep 26 | 114 | 6b |
| St. Johns Industrial Airport | May 3 | Oct 10 | 160 | 6b |
| Stewart Mountain Dam | Feb 13 | Dec 5 | 295 | 9b |
| Sunrise Mountain | Jun 18 | Sep 18 | 91 | 6a |
| Sunset Crater National Monument | Jun 16 | Sep 19 | 94 | 6b |
| Superior | Jan 18 | Dec 28 | 342 | 9b |
| Tacna | Feb 13 | Dec 1 | 288 | 9b |
| Teec Nos Pos | Apr 11 | Nov 1 | 200 | 7a |
| Tempe Asu | Feb 13 | Dec 5 | 298 | 9b |
| Temple Bar | Feb 4 | Dec 10 | 309 | 9b |
| Tohono Chul | Feb 26 | Dec 4 | 279 | 9a |
| Tombstone | Mar 4 | Nov 29 | 264 | 8b |
| Tuba City | Apr 16 | Oct 28 | 193 | 7b |
| Tucson | Jan 20 | Dec 17 | 332 | 9b |
| Tucson 11 mi W | Feb 8 | Dec 10 | 303 | 9b |
| Tucson 17 mi NW | Feb 23 | Dec 6 | 287 | 9b |
| Tucson Camp Avenue Experiment | Feb 20 | Nov 27 | 280 | 9b |
| Tucson International Airport | Feb 5 | Dec 9 | 307 | 9b |
| Tucson U of A | Feb 11 | Dec 2 | 293 | 9b |
| Tumacacori National Monument | Apr 5 | Nov 10 | 217 | 8b |
| Tuzigoot | Mar 30 | Nov 10 | 223 | 8b |
| Twin Arrows | Apr 14 | Oct 25 | 192 | 7a |
| Wahweap | Mar 14 | Nov 16 | 244 | 7b |
| Walnut Canyon National Monument | May 13 | Oct 6 | 145 | 6a |
| Walnut Creek | May 24 | Oct 7 | 135 | 7b |
| Wickenburg | Mar 7 | Nov 20 | 254 | 9a |
| Wikieup | Mar 19 | Nov 23 | 246 | 9b |
| Willcox | Apr 9 | Oct 31 | 204 | 8b |
| Williams | May 22 | Oct 5 | 135 | 6b |
| Williams 35 mi NNW | May 9 | Oct 19 | 161 | 7a |
| Willow Beach | Jan 7 | Dec 29 | 358 | 9b |
| Window Rock Airport | May 29 | Sep 28 | 121 | 6b |
| Winslow Municipal Airport | Apr 27 | Oct 18 | 174 | 7a |
| Wittmann | Feb 5 | Dec 11 | 306 | 9b |
| Wupatki National Monument | Apr 7 | Nov 3 | 206 | 6b |
| Youngtown | Jan 20 | Dec 15 | 331 | 9b |
| Yucca | Feb 18 | Dec 2 | 288 | 9b |
| Yuma | Jan 11 | Dec 21 | 347 | 9b |
| Yuma Proving Ground | Jan 4 | Dec 25 | 361 | 10a |
| Yuma Quartermaster Depot | Jan 8 | Dec 28 | 362 | 10a |
Median dates from NOAA 1991–2020 climate normals. How to read them.