Frost dates for 94803El Sobrante, CA
Frost occurs in about 22% of years near El Sobrante, based on NOAA 1991-2020 records for the Richmond, CA station.
Frost occurs in about 22% of years. Frost-tender plants can usually grow year-round, but cover them if a rare cold snap is forecast.
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Dec 22 · Jan 17 · Feb 23 | Dec 2 · Dec 24 · Jan 21 | 343 days | 80% |
| Frost / freeze (32°F) | Dec 14 · Jan 4 · Jan 26 | Dec 11 · Jan 2 · Jan 22 | 365 days | 22% |
| Hard freeze (28°F) | — | — | 365 days | 0% |
Where these dates come from
ZIP code 94803 is matched to the NOAA station Richmond, CA, 9.5 km away, at 20 ft elevation (144 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Richmond, CA (used) | 20 ft | Jan 4 | Jan 2 |
| Berkeley, CA | 310 ft | Jan 3 | Jan 1 |
| Martinez Wtp, CA | 40 ft | Feb 28 | Nov 22 |
| Vallejo, CA | 341 ft | Jan 17 | Dec 27 |
Frost dates near El Sobrante
- El Sobrante, CA 94820 · last Jan 3, first Jan 1
- Pinole, CA 94564 · last Jan 4, first Jan 2
- San Pablo, CA 94806 · last Jan 4, first Jan 2
- Richmond, CA 94805 · last Jan 4, first Jan 2
- Hercules, CA 94547 · last Feb 28, first Nov 22
- El Cerrito, CA 94530 · last Jan 3, first Jan 1
- Rodeo, CA 94572 · last Feb 28, first Nov 22
- Berkeley, CA 94707 · last Jan 3, first Jan 1
Frequently asked questions
- When is the last frost in El Sobrante, CA?
- Frost occurs in about 22% of years at the nearest NOAA station (Richmond, CA), so there is no reliable average last frost date.
- When is the first frost in El Sobrante, CA?
- Frost occurs in about 22% of years at the nearest NOAA station.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.