Frost dates for Picacho 8 SE, AZ
At Picacho 8 SE, the median last spring frost (32°F) is Feb 6 and the median first fall frost is Dec 9, for a typical growing season of 308 days. For a 90% chance that the last frost has passed, wait until Mar 5. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 6Last spring frost (median)50% chance of 32°F after this date
- Mar 5Safer planting date10% chance of 32°F after this date
- Dec 9First fall frost (median)50% chance of 32°F by this date
- 308 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 2 | Feb 28 | Mar 26 |
| 32°F | Jan 6 | Feb 6 | Mar 5 |
| 28°F | Dec 17 | Jan 14 | Feb 13 |
| 24°F | Dec 13 | Jan 6 | Feb 7 |
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 11 | Nov 29 | Dec 15 |
| 32°F | Nov 22 | Dec 9 | Dec 26 |
| 28°F | Dec 1 | Dec 19 | Jan 22 |
| 24°F | Dec 12 | Jan 2 | Feb 2 |
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 | 239 days | 271 days | 305 days |
| 32°F | 276 days | 308 days | 340 days |
| 28°F | 311 days | 342 days | 365 days |
| 24°F | 337 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 99% |
| 28°F | 83% |
| 24°F | 36% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85141 | 9a | 20 to 25°F | 3 km |
| 85145 | 9a | 20 to 25°F | 12 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 USC00026513, at 32.6464, -111.4017, elevation 604 m (1,981 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 10.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Eloy 4 NE (19 km)
- Robson Rch (28 km)
- Arizona City (29 km)
- Casa Grande (40 km)
- Casa Grande National Monument (41 km)
- Florence (43 km)
- Tucson 17 NW (48 km)
- Tucson 11 W (50 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.