Frost dates for Wickenburg, AZ
At Wickenburg, the median last spring frost (32°F) is Mar 7 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 Apr 8. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 7Last spring frost (median)50% chance of 32°F after this date
- Apr 8Safer 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 11 | Apr 3 | Apr 25 |
| 32°F | Feb 14 | Mar 7 | Apr 8 |
| 28°F | Jan 15 | Feb 14 | Mar 6 |
| 24°F | Dec 19 | Jan 20 | Feb 22 |
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 9 | Nov 22 |
| 32°F | Nov 4 | Nov 20 | Dec 5 |
| 28°F | Nov 14 | Dec 2 | Dec 22 |
| 24°F | Nov 27 | Dec 15 | Jan 12 |
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 | 191 days | 219 days | 245 days |
| 32°F | 223 days | 254 days | 282 days |
| 28°F | 261 days | 290 days | 325 days |
| 24°F | 297 days | 333 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 | 91% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85390 | 9a | 20 to 25°F | 15 km |
| 85332 | 9a | 20 to 25°F | 30 km |
| 85362 | 8b | 15 to 20°F | 35 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 USC00029287, at 33.9792, -112.7403, elevation 639 m (2,095 ft).
- Data quality: Representative (10+ years), 18 years of freeze data.
- Average days per year at or below 32°F: 47.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Wittmann 1se (30 km)
- Castle Hot Springs (35 km)
- Aguila (41 km)
- Youngtown (59 km)
- Litchfield Park (64 km)
- Cordes (64 km)
- Phoenix Deer Valley Muni Airport (69 km)
- Prescott (72 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.