Frost dates for Moffett Federal Airfield, CA
At Moffett Federal Airfield, the median last spring frost (32°F) is Jan 6 and the median first fall frost is Dec 23, for a typical growing season of 353 days. For a 90% chance that the last frost has passed, wait until Feb 4. Nearby ZIP codes are in USDA hardiness zones 9b to 10a.
- Jan 6Last spring frost (median)50% chance of 32°F after this date
- Feb 4Safer planting date10% chance of 32°F after this date
- Dec 23First fall frost (median)50% chance of 32°F by this date
- 353 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 3 | Feb 6 | Mar 6 |
| 32°F | Dec 16 | Jan 6 | Feb 4 |
| 28°F | Dec 16 | Jan 1 | Jan 22 |
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 20 | Dec 6 | Dec 30 |
| 32°F | Dec 3 | Dec 23 | Jan 16 |
| 28°F | Dec 13 | Dec 31 | Jan 22 |
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 | 270 days | 306 days | 340 days |
| 32°F | 323 days | 353 days | 365 days |
| 28°F | 362 days | 365 days | 365 days |
| 24°F | 365 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 99% |
| 32°F | 70% |
| 28°F | 14% |
| 24°F | 0% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 94043 | 10a | 30 to 35°F | 2 km |
| 94089 | 10a | 30 to 35°F | 3 km |
| 94041 | 9b | 25 to 30°F | 3 km |
| 94085 | 10a | 30 to 35°F | 3 km |
| 94040 | 9b | 25 to 30°F | 4 km |
| 94086 | 9b | 25 to 30°F | 4 km |
| 95002 | 10a | 30 to 35°F | 5 km |
| 94087 | 9b | 25 to 30°F | 6 km |
| 94024 | 9b | 25 to 30°F | 8 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 USW00023244, at 37.4058, -122.0481, elevation 12 m (39 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 2.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Palo Alto (9 km)
- San Jose (12 km)
- Newark (12 km)
- San Jose (14 km)
- Fremont (15 km)
- Skyline Ridge Preserve (16 km)
- Woodside Fire Station 1 (19 km)
- Redwood City (19 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.