Frost dates for Arizona City, AZ
At Arizona City, the median last spring frost (32°F) is Feb 28 and the median first fall frost is Nov 21, for a typical growing season of 266 days. For a 90% chance that the last frost has passed, wait until Mar 14. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 28Last spring frost (median)50% chance of 32°F after this date
- Mar 14Safer planting date10% chance of 32°F after this date
- Nov 21First fall frost (median)50% chance of 32°F by this date
- 266 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 27 | Mar 17 | Apr 4 |
| 32°F | Feb 3 | Feb 28 | Mar 14 |
| 28°F | Jan 10 | Feb 6 | Mar 1 |
| 24°F | Dec 19 | Jan 16 | Feb 14 |
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 25 | Nov 12 | Nov 24 |
| 32°F | Nov 5 | Nov 21 | Dec 6 |
| 28°F | Nov 16 | Dec 4 | Dec 21 |
| 24°F | Nov 27 | Dec 18 | Jan 17 |
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 | 214 days | 238 days | 259 days |
| 32°F | 243 days | 266 days | 294 days |
| 28°F | 270 days | 300 days | 333 days |
| 24°F | 305 days | 336 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 |
|---|---|---|---|
| 85123 | 9a | 20 to 25°F | 2 km |
| 85131 | 9a | 20 to 25°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 USC00020404, at 32.7306, -111.6917, elevation 465 m (1,525 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 33.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Robson Rch (11 km)
- Eloy 4 NE (17 km)
- Casa Grande (18 km)
- Picacho 8 SE (29 km)
- Casa Grande National Monument (33 km)
- Florence (44 km)
- Chandler Heights (53 km)
- Maricopa 4 N (53 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.