Frost dates for Wrightwood, CA
At Wrightwood, the median last spring frost (32°F) is May 16 and the median first fall frost is Oct 13, for a typical growing season of 151 days. For a 90% chance that the last frost has passed, wait until Jun 9. Nearby ZIP codes are in USDA hardiness zones 7b to 9b.
- May 16Last spring frost (median)50% chance of 32°F after this date
- Jun 9Safer planting date10% chance of 32°F after this date
- Oct 13First fall frost (median)50% chance of 32°F by this date
- 151 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 | May 14 | Jun 4 | Jun 20 |
| 32°F | Apr 25 | May 16 | Jun 9 |
| 28°F | Apr 6 | Apr 25 | May 13 |
| 24°F | Mar 7 | Apr 4 | Apr 25 |
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 | Sep 10 | Oct 1 | Oct 17 |
| 32°F | Sep 25 | Oct 13 | Nov 1 |
| 28°F | Oct 10 | Oct 30 | Nov 13 |
| 24°F | Oct 22 | Nov 12 | Dec 1 |
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 | 93 days | 119 days | 146 days |
| 32°F | 122 days | 151 days | 178 days |
| 28°F | 160 days | 186 days | 209 days |
| 24°F | 193 days | 222 days | 255 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 92372 | 8b | 15 to 20°F | 10 km |
| 92397 | 7b | 5 to 10°F | 11 km |
| 91759 | 8a | 10 to 15°F | 12 km |
| 92371 | 8b | 15 to 20°F | 12 km |
| 92358 | 8a | 10 to 15°F | 14 km |
| 93563 | 8a | 10 to 15°F | 16 km |
| 91702 | 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 USC00049822, at 34.3617, -117.6386, elevation 1829 m (6,000 ft).
- Data quality: Representative (10+ years), 10 years of freeze data.
- Average days per year at or below 32°F: 159.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- El Mirage (25 km)
- Pearblossom (28 km)
- Pomona/fairplex (33 km)
- Ontario Intl Airport (34 km)
- Hesperia 2e (35 km)
- Victorville (37 km)
- Mount Wilson Cbs (42 km)
- Chino Airport (43 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.