Frost dates for E Mesa, AZ
At E Mesa, the median last spring frost (32°F) is Feb 1 and the median first fall frost is Dec 10, for a typical growing season of 312 days. For a 90% chance that the last frost has passed, wait until Feb 28. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 1Last spring frost (median)50% chance of 32°F after this date
- Feb 28Safer planting date10% chance of 32°F after this date
- Dec 10First fall frost (median)50% chance of 32°F by this date
- 312 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 31 | Feb 27 | Mar 15 |
| 32°F | Jan 1 | Feb 1 | Feb 28 |
| 28°F | Dec 13 | Jan 11 | Feb 11 |
| 24°F | Dec 11 | Jan 8 | Feb 5 |
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 13 | Nov 30 | Dec 15 |
| 32°F | Nov 22 | Dec 10 | Jan 1 |
| 28°F | Dec 1 | Dec 26 | Jan 28 |
| 24°F | Dec 10 | Jan 5 | 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 | 247 days | 276 days | 304 days |
| 32°F | 280 days | 312 days | 348 days |
| 28°F | 317 days | 352 days | 365 days |
| 24°F | 355 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 98% |
| 28°F | 70% |
| 24°F | 15% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 85208 | 9b | 25 to 30°F | 2 km |
| 85207 | 9b | 25 to 30°F | 4 km |
| 85209 | 9b | 25 to 30°F | 5 km |
| 85205 | 9b | 25 to 30°F | 7 km |
| 85206 | 9b | 25 to 30°F | 7 km |
| 85120 | 9b | 25 to 30°F | 8 km |
| 85234 | 9b | 25 to 30°F | 11 km |
| 85212 | 9b | 25 to 30°F | 11 km |
| 85213 | 9b | 25 to 30°F | 12 km |
| 85236 | 9b | 25 to 30°F | 13 km |
| 85296 | 9b | 25 to 30°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 USC00022782, at 33.4192, -111.6444, elevation 463 m (1,518 ft).
- Data quality: Representative (10+ years), 15 years of freeze data.
- Average days per year at or below 32°F: 11.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Apache Junction 5 NE (16 km)
- Stewart Mountain Dam (18 km)
- Fountain Hills (21 km)
- Chandler Heights (24 km)
- Mormon Flat (24 km)
- Tempe Asu (26 km)
- Phoenix Sky Harbor Intl Airport (33 km)
- Scottsdale Muni Airport (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.