Frost dates for Fort Huachuca Pioneer Airfield, AZ
At Fort Huachuca Pioneer Airfield, the median last spring frost (32°F) is Mar 16 and the median first fall frost is Nov 21, for a typical growing season of 246 days. For a 90% chance that the last frost has passed, wait until Apr 12. Nearby ZIP codes are in USDA hardiness zone 8b.
- Mar 16Last spring frost (median)50% chance of 32°F after this date
- Apr 12Safer planting date10% chance of 32°F after this date
- Nov 21First fall frost (median)50% chance of 32°F by this date
- 246 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 20 | Apr 9 | Apr 26 |
| 32°F | Feb 19 | Mar 16 | Apr 12 |
| 28°F | Jan 16 | Feb 20 | Mar 23 |
| 24°F | Dec 23 | Jan 26 | Feb 23 |
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 24 | Nov 8 | Nov 24 |
| 32°F | Nov 3 | Nov 21 | Dec 7 |
| 28°F | Nov 18 | Dec 6 | Dec 24 |
| 24°F | Dec 1 | Dec 22 | Jan 25 |
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 | 186 days | 211 days | 238 days |
| 32°F | 214 days | 246 days | 277 days |
| 28°F | 252 days | 288 days | 325 days |
| 24°F | 297 days | 331 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 89% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85613 | 8b | 15 to 20°F | 8 km |
| 85616 | 8b | 15 to 20°F | 15 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 USW00053146, at 31.6072, -110.4281, elevation 1453 m (4,768 ft).
- Data quality: Estimated from nearby stations (2+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 34.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Elgin 5 S (8 km)
- Canelo 1 NW (11 km)
- Sierra Vista (16 km)
- Sonoita (23 km)
- Kartchner Caverns (26 km)
- Coronado Nmem (33 km)
- Benson 6se (35 km)
- Tombstone (36 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.