Frost dates for Tempe Asu, AZ
At Tempe Asu, the median last spring frost (32°F) is Feb 13 and the median first fall frost is Dec 5, for a typical growing season of 298 days. For a 90% chance that the last frost has passed, wait until Mar 9. Nearby ZIP codes are in USDA hardiness zones 9b to 10a.
- Feb 13Last spring frost (median)50% chance of 32°F after this date
- Mar 9Safer planting date10% chance of 32°F after this date
- Dec 5First fall frost (median)50% chance of 32°F by this date
- 298 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 14 | Mar 8 | Apr 7 |
| 32°F | Jan 12 | Feb 13 | Mar 9 |
| 28°F | Dec 19 | Jan 16 | Feb 19 |
| 24°F | Dec 6 | Jan 3 | Jan 28 |
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 7 | Nov 26 | Dec 9 |
| 32°F | Nov 18 | Dec 5 | Dec 24 |
| 28°F | Nov 27 | Dec 19 | Jan 19 |
| 24°F | Dec 4 | Dec 31 | Jan 24 |
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 | 226 days | 259 days | 287 days |
| 32°F | 266 days | 298 days | 331 days |
| 28°F | 299 days | 337 days | 365 days |
| 24°F | 341 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 87% |
| 24°F | 32% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85281 | 9b | 25 to 30°F | 1 km |
| 85282 | 10a | 30 to 35°F | 4 km |
| 85257 | 9b | 25 to 30°F | 4 km |
| 85201 | 9b | 25 to 30°F | 7 km |
| 85202 | 10a | 30 to 35°F | 7 km |
| 85283 | 9b | 25 to 30°F | 7 km |
| 85251 | 9b | 25 to 30°F | 8 km |
| 85210 | 10a | 30 to 35°F | 8 km |
| 85284 | 9b | 25 to 30°F | 10 km |
| 85203 | 9b | 25 to 30°F | 11 km |
| 85256 | 9b | 25 to 30°F | 12 km |
| 85224 | 9b | 25 to 30°F | 12 km |
| 85204 | 9b | 25 to 30°F | 13 km |
| 85233 | 9b | 25 to 30°F | 13 km |
| 85225 | 9b | 25 to 30°F | 15 km |
| 85226 | 9b | 25 to 30°F | 17 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 USC00028499, at 33.4258, -111.9217, elevation 356 m (1,167 ft).
- Data quality: Representative (10+ years), 24 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
- Phoenix Sky Harbor Intl Airport (8 km)
- South Phoenix (15 km)
- Scottsdale Muni Airport (22 km)
- Laveen 3 SSE (23 km)
- E Mesa (26 km)
- Fountain Hills (28 km)
- Phoenix Deer Valley Muni Airport (33 km)
- Chandler Heights (33 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.