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Arizona frost dates
Across the 21Arizona weather stations below, the average last spring frost ranges from Jan 4 in Yuma Proving Ground to Jun 17 in Grand Canyon Np. The statewide middle is about Apr 2 for the last spring frost and Nov 11 for the first fall frost. Yuma Proving Ground has the longest growing season, about 355 days. Hardiness zones in these places: 6a, 6b, 7a, 7b, 8a, 8b, 9b, 10a.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Yuma Proving Ground | 10a | Jan 4 | Feb 9 | Dec 25 | 355 |
| Scottsdale | 10a | Jan 6 | Feb 7 | Dec 26 | 354 |
| Phoenix Deer Valley | 10a | Jan 8 | Feb 12 | Dec 25 | 351 |
| Yuma 27 Ene | 9b | Jan 11 | Feb 14 | Dec 21 | 344 |
| Tucson | 9b | Feb 5 | Mar 2 | Dec 9 | 307 |
| Tucson 11 W | 9b | Feb 8 | Mar 8 | Dec 10 | 305 |
| Page | 7b | Mar 7 | Mar 31 | Nov 15 | 253 |
| Safford | 8b | Mar 8 | Mar 27 | Nov 20 | 257 |
| Ft Huachuca Pioneer Airfield | 8b | Mar 16 | Apr 12 | Nov 21 | 250 |
| Nogales | 8b | Mar 20 | Apr 13 | Nov 17 | 242 |
| Kingman Mohave | 8b | Apr 2 | Apr 21 | Nov 11 | 223 |
| Douglas Bisbee Inl | 8a | Apr 11 | Apr 27 | Nov 2 | 205 |
| Elgin 5 S | 8a | Apr 18 | May 3 | Nov 1 | 197 |
| Prescott Love | 7b | Apr 20 | May 7 | Oct 27 | 190 |
| Winslow | 7a | Apr 27 | May 14 | Oct 18 | 174 |
| Payson | 8b | Apr 29 | May 20 | Oct 24 | 178 |
| Johns Industrial | 6b | May 3 | May 19 | Oct 10 | 160 |
| Williams 35 Nnw | 7a | May 9 | May 27 | Oct 19 | 163 |
| Window Rock | 6b | May 29 | Jun 10 | Sep 28 | 122 |
| Flagstaff Pulliam | 6a | Jun 4 | Jun 19 | Sep 28 | 116 |
| Grand Canyon Np | 7a | Jun 17 | Jul 1 | Sep 24 | 99 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in Arizona
Using the statewide middle dates (last frost Apr 2, first frost Nov 11). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in Arizona |
|---|---|
| Tomatoes | Apr 9 – Apr 23 |
| Peas | Feb 19 – Mar 12; fall: Aug 19 – Sep 9 |
| Potatoes | Mar 5 – Mar 26 |
| Green beans | Apr 9 – Apr 23; fall: Aug 26 – Sep 9 |
| Garlic | Nov 11 – Dec 9 |
| Tulips | Oct 28 – Dec 9 |