Frost dates in USDA zone 10a (30 to 35°F)
USDA zone 10a covers places whose coldest winter night averages 30 to 35°F. Across the 127 NOAA weather stations in zone 10a with frost dates, the frost season, if any, runs about Jan 2 to Jan 19 at the median, and station last-frost dates range from Jan 4 to Feb 13 for most stations. Enter your ZIP for your local date.
- Jan 19Median last spring frostmost stations Jan 4–Feb 13
- Jan 2Median first fall frostthe following January
- 1,234ZIP codes in zone 10a30 to 35°F average coldest night
- 127Stations with frost datesof 133 NOAA stations matched
Earliest and latest last-frost stations in zone 10a
| Station | Last spring frost | First fall frost |
|---|---|---|
| Bodega 6 WSW, CA | Jan 1 | Dec 31 |
| Monterey, CA | Jan 1 | Dec 30 |
| Newark, CA | Jan 1 | Dec 27 |
| Palm Springs, CA | Jan 1 | Dec 31 |
| Burbank Valley Pump Plant, CA | Jan 2 | Dec 26 |
| Escondido #2, CA | Jan 2 | Dec 30 |
| Hayward Air Terminal, CA | Jan 2 | Dec 25 |
| Monterey Peninsul Airport, CA | Jan 2 | Dec 23 |
| Northridge Cal State, CA | Jan 2 | Jan 1 |
| Berkeley, CA | Jan 3 | Jan 1 |
| Station | Last spring frost | First fall frost |
|---|---|---|
| Van Nuys Airport, CA | Dec 31 | Dec 30 |
| Indio Fire Station, CA | Dec 31 | Dec 27 |
| Camarillo Airport, CA | Dec 31 | Dec 28 |
| Burbank Glendale Pasadena Airport, CA | Dec 31 | Dec 28 |
| San Francisco Intl Airport, CA | Dec 29 | Dec 26 |
| Mount Wilson Cbs, CA | Apr 28 | Nov 15 |
| Cachuma Lake, CA | Apr 11 | Nov 8 |
| Gibraltar Dam #2, CA | Mar 20 | Nov 27 |
| El Capitan Dam, CA | Mar 19 | Dec 8 |
| Fort Ross, CA | Feb 26 | Dec 27 |
Zone 10a by state
| State | Stations | Median last frost | Median first frost |
|---|---|---|---|
| Arizona | 8 | Jan 6 | Dec 26 |
| California | 61 | Jan 11 | Dec 27 |
| Florida | 40 | Jan 24 | Jan 11 |
| Louisiana | 2 | Jan 24 | Jan 6 |
| Texas | 22 | Jan 11 | Jan 1 |
Neighboring zones
How these numbers are made
Each ZIP code gets one zone from the USDA-ARS / PRISM 2023 ZIP tables, which use the map’s 1991–2020 average of the coldest winter night of each year. A ZIP code can span more than one zone, and USDA’s own lookup works by ZIP or address. Each NOAA station is assigned the most common zone among the closest ZIP codes listed on its station page (a tie goes to the zone of the closest of those ZIPs). Frost dates are NOAA’s 50%-probability (median) 32°F dates for each station, the same values shown on the station pages. Zone figures are the median, 10th and 90th percentile across stations; a first fall frost in January to June is counted in the following year.
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.
Sources
- 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.
- 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.
- 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.