Frost dates for Wittmann 1se, AZ
At Wittmann 1se, the median last spring frost (32°F) is Feb 5 and the median first fall frost is Dec 11, for a typical growing season of 306 days. For a 90% chance that the last frost has passed, wait until Mar 3. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 5Last spring frost (median)50% chance of 32°F after this date
- Mar 3Safer planting date10% chance of 32°F after this date
- Dec 11First fall frost (median)50% chance of 32°F by this date
- 306 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 | Feb 6 | Mar 4 | Apr 2 |
| 32°F | Jan 6 | Feb 5 | Mar 3 |
| 28°F | Dec 14 | Jan 15 | Feb 12 |
| 24°F | Dec 22 | Jan 11 | Feb 5 |
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 | Nov 8 | Nov 26 | Dec 14 |
| 32°F | Nov 20 | Dec 11 | Jan 2 |
| 28°F | Dec 4 | Dec 27 | Jan 28 |
| 24°F | Dec 19 | Jan 7 | Feb 3 |
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 | 232 days | 266 days | 297 days |
| 32°F | 270 days | 306 days | 341 days |
| 28°F | 311 days | 345 days | 365 days |
| 24°F | 347 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 99% |
| 28°F | 76% |
| 24°F | 23% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85361 | 9b | 25 to 30°F | 10 km |
| 85387 | 9b | 25 to 30°F | 10 km |
| 85383 | 9b | 25 to 30°F | 20 km |
| 85396 | 9b | 25 to 30°F | 32 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 USC00029464, at 33.7775, -112.5231, elevation 513 m (1,683 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 13.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Castle Hot Springs (27 km)
- Youngtown (29 km)
- Wickenburg (30 km)
- Litchfield Park (34 km)
- Phoenix Deer Valley Muni Airport (42 km)
- Carefree (58 km)
- Scottsdale Muni Airport (59 km)
- Laveen 3 SSE (60 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.