Frost dates for Painted Rock Dam, AZ
At Painted Rock Dam, the median last spring frost (32°F) is Jan 21 and the median first fall frost is Dec 15, for a typical growing season of 327 days. For a 90% chance that the last frost has passed, wait until Feb 18. Nearby ZIP codes are in USDA hardiness zone 9b.
- Jan 21Last spring frost (median)50% chance of 32°F after this date
- Feb 18Safer planting date10% chance of 32°F after this date
- Dec 15First fall frost (median)50% chance of 32°F by this date
- 327 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 | Jan 18 | Feb 12 | Mar 3 |
| 32°F | Dec 24 | Jan 21 | Feb 18 |
| 28°F | Dec 15 | Jan 8 | Feb 6 |
| 24°F | Dec 27 | Jan 5 | Jan 20 |
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 17 | Dec 1 | Dec 18 |
| 32°F | Nov 27 | Dec 15 | Jan 4 |
| 28°F | Dec 8 | Dec 28 | Jan 23 |
| 24°F | Dec 27 | Jan 5 | Jan 19 |
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 | 267 days | 293 days | 322 days |
| 32°F | 294 days | 327 days | 357 days |
| 28°F | 333 days | 362 days | 365 days |
| 24°F | 364 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 96% |
| 28°F | 55% |
| 24°F | 11% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85322 | 9b | 25 to 30°F | 17 km |
| 85354 | 9b | 25 to 30°F | 37 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 USC00026194, at 33.0772, -113.0317, elevation 173 m (568 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 9.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Gila Bend 2se (36 km)
- Dateland Whitewing Rch (45 km)
- Litchfield Park (78 km)
- Ajo (80 km)
- Laveen 3 SSE (87 km)
- Youngtown (89 km)
- Kofa Mine (90 km)
- Wittmann 1se (91 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.