Frost dates for Alpine, AZ
At Alpine, the median last spring frost (32°F) is Jun 15 and the median first fall frost is Sep 21, for a typical growing season of 96 days. For a 90% chance that the last frost has passed, wait until Jun 30. Nearby ZIP codes are in USDA hardiness zone 6b.
- Jun 15Last spring frost (median)50% chance of 32°F after this date
- Jun 30Safer planting date10% chance of 32°F after this date
- Sep 21First fall frost (median)50% chance of 32°F by this date
- 96 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 | Jun 14 | Jun 28 | Jul 12 |
| 32°F | Jun 2 | Jun 15 | Jun 30 |
| 28°F | May 19 | Jun 3 | Jun 19 |
| 24°F | May 2 | May 19 | Jun 6 |
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 | Aug 29 | Sep 10 | Sep 22 |
| 32°F | Sep 7 | Sep 21 | Oct 1 |
| 28°F | Sep 16 | Sep 28 | Oct 11 |
| 24°F | Sep 25 | Oct 8 | Oct 23 |
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 | 52 days | 73 days | 89 days |
| 32°F | 75 days | 96 days | 114 days |
| 28°F | 96 days | 116 days | 134 days |
| 24°F | 117 days | 139 days | 163 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85920 | 6b | -5 to 0°F | 3 km |
| 85932 | 6b | -5 to 0°F | 14 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 USC00020159, at 33.8492, -109.1469, elevation 2454 m (8,050 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 218.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Springerville (33 km)
- Greer (34 km)
- Sunrise Mountain (41 km)
- Black River Pumps (70 km)
- Mc Nary 2n (72 km)
- St. Johns Industrial Airport (77 km)
- Pinetop 2e (78 km)
- Saint Johns (78 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.