Frost dates for Fairmont, CA
At Fairmont, the median last spring frost (32°F) is Apr 6 and the median first fall frost is Nov 29, for a typical growing season of 236 days. For a 90% chance that the last frost has passed, wait until May 20. Nearby ZIP codes are in USDA hardiness zones 8b to 9b.
- Apr 6Last spring frost (median)50% chance of 32°F after this date
- May 20Safer planting date10% chance of 32°F after this date
- Nov 29First fall frost (median)50% chance of 32°F by this date
- 236 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 | Mar 28 | Apr 30 | Jun 1 |
| 32°F | Feb 20 | Apr 6 | May 20 |
| 28°F | Jan 6 | Feb 25 | May 1 |
| 24°F | Dec 16 | Jan 20 | Mar 17 |
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 | Oct 24 | Nov 13 | Dec 2 |
| 32°F | Nov 5 | Nov 29 | Dec 15 |
| 28°F | Nov 20 | Dec 10 | Jan 7 |
| 24°F | Nov 29 | Dec 29 | Feb 15 |
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 | 159 days | 196 days | 236 days |
| 32°F | 187 days | 236 days | 289 days |
| 28°F | 227 days | 293 days | 344 days |
| 24°F | 300 days | 353 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 99% |
| 24°F | 69% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 93536 | 8b | 15 to 20°F | 5 km |
| 93532 | 9a | 20 to 25°F | 10 km |
| 91390 | 9b | 25 to 30°F | 15 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 USC00042941, at 34.7050, -118.4297, elevation 933 m (3,060 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 24.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Lancaster Wm J Fox Field (20 km)
- Sandberg (27 km)
- Palmdale Airport (33 km)
- Palmdale (33 km)
- Newhall 5nw (38 km)
- Tehachapi 4 SE (44 km)
- Mojave (45 km)
- Northridge Cal State (52 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.