Frost dates for Florence, AZ
At Florence, the median last spring frost (32°F) is Jan 30 and the median first fall frost is Dec 12, for a typical growing season of 319 days. For a 90% chance that the last frost has passed, wait until Feb 24. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Jan 30Last spring frost (median)50% chance of 32°F after this date
- Feb 24Safer planting date10% chance of 32°F after this date
- Dec 12First fall frost (median)50% chance of 32°F by this date
- 319 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 25 | Feb 21 | Mar 13 |
| 32°F | Dec 27 | Jan 30 | Feb 24 |
| 28°F | Dec 11 | Jan 8 | Feb 11 |
| 24°F | Dec 14 | Jan 6 | Jan 29 |
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 12 | Nov 29 | Dec 19 |
| 32°F | Nov 22 | Dec 12 | Jan 12 |
| 28°F | Dec 1 | Dec 26 | Jan 31 |
| 24°F | Dec 11 | Jan 3 | Jan 27 |
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 | 250 days | 281 days | 312 days |
| 32°F | 286 days | 319 days | 354 days |
| 28°F | 324 days | 362 days | 365 days |
| 24°F | 362 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 95% |
| 28°F | 57% |
| 24°F | 16% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85191 | 9a | 20 to 25°F | 8 km |
| 85132 | 9b | 25 to 30°F | 20 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 USC00023027, at 33.0364, -111.3881, elevation 427 m (1,400 ft).
- Data quality: Representative (10+ years), 13 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
- Casa Grande National Monument (15 km)
- Eloy 4 NE (31 km)
- Chandler Heights (33 km)
- Robson Rch (34 km)
- Casa Grande (35 km)
- Superior (40 km)
- Picacho 8 SE (43 km)
- Arizona City (44 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.