Frost dates for Miami, AZ
At Miami, the median last spring frost (32°F) is Feb 24 and the median first fall frost is Dec 1, for a typical growing season of 279 days. For a 90% chance that the last frost has passed, wait until Mar 18. Nearby ZIP codes are in USDA hardiness zones 8a to 9a.
- Feb 24Last spring frost (median)50% chance of 32°F after this date
- Mar 18Safer planting date10% chance of 32°F after this date
- Dec 1First fall frost (median)50% chance of 32°F by this date
- 279 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 25 | Mar 19 | Apr 11 |
| 32°F | Jan 30 | Feb 24 | Mar 18 |
| 28°F | Dec 26 | Jan 30 | Feb 28 |
| 24°F | Dec 14 | Jan 5 | Feb 8 |
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 2 | Nov 19 | Dec 3 |
| 32°F | Nov 15 | Dec 1 | Dec 15 |
| 28°F | Nov 26 | Dec 13 | Jan 1 |
| 24°F | Dec 7 | Dec 28 | Jan 31 |
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 | 242 days | 268 days |
| 32°F | 247 days | 279 days | 308 days |
| 28°F | 283 days | 321 days | 352 days |
| 24°F | 327 days | 360 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 97% |
| 24°F | 56% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85532 | 9a | 20 to 25°F | 3 km |
| 85539 | 8a | 10 to 15°F | 9 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 USC00025512, at 33.4044, -110.8700, elevation 1085 m (3,560 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 25.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Globe #3 (7 km)
- Superior (24 km)
- Roosevelt 1 S (35 km)
- San Carlos Reservoir (40 km)
- Mormon Flat (56 km)
- Apache Junction 5 NE (57 km)
- Florence (63 km)
- Stewart Mountain Dam (64 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.