Frost dates for Safford Muni Airport, AZ
At Safford Muni Airport, the median last spring frost (32°F) is Mar 8 and the median first fall frost is Nov 20, for a typical growing season of 254 days. For a 90% chance that the last frost has passed, wait until Mar 27. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 8Last spring frost (median)50% chance of 32°F after this date
- Mar 27Safer planting date10% chance of 32°F after this date
- Nov 20First fall frost (median)50% chance of 32°F by this date
- 254 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Mar 13 | Apr 2 | Apr 19 |
| 32°F | Feb 18 | Mar 8 | Mar 27 |
| 28°F | Jan 24 | Feb 19 | Mar 9 |
| 24°F | Dec 25 | Jan 28 | Feb 25 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Oct 25 | Nov 9 | Nov 23 |
| 32°F | Nov 4 | Nov 20 | Dec 2 |
| 28°F | Nov 16 | Dec 1 | Dec 16 |
| 24°F | Nov 26 | Dec 14 | Jan 9 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 195 days | 220 days | 245 days |
| 32°F | 227 days | 254 days | 277 days |
| 28°F | 258 days | 283 days | 314 days |
| 24°F | 287 days | 322 days | 354 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 97% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85531 | 8b | 15 to 20°F | 14 km |
| 85552 | 8b | 15 to 20°F | 15 km |
| 85551 | 8b | 15 to 20°F | 15 km |
| 85546 | 8b | 15 to 20°F | 18 km |
| 85543 | 8b | 15 to 20°F | 27 km |
| 85540 | 8b | 15 to 20°F | 29 km |
| 85535 | 8b | 15 to 20°F | 30 km |
| 85536 | 8b | 15 to 20°F | 46 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USW00093084, at 32.8547, -109.6353, elevation 968 m (3,176 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 44.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Safford Ag Center (6 km)
- Fort Thomas 2 SW (37 km)
- Clifton (38 km)
- Duncan (49 km)
- Bowie (60 km)
- Willcox (69 km)
- Black River Pumps (70 km)
- San Simon (73 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.