Frost dates for 91933Imperial Beach, CA
Frost occurs in about 7% of years near Imperial Beach, based on NOAA 1991-2020 records for the Chula Vista, CA station.
Frost occurs in about 7% 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 15 · Jan 8 · Feb 6 | Dec 8 · Dec 27 · Jan 27 | 356 days | 61% |
| Frost / freeze (32°F) | — | — | 365 days | 7% |
| Hard freeze (28°F) | — | — | 365 days | 0% |
Where these dates come from
ZIP code 91933 is matched to the NOAA station Chula Vista, CA, 6.7 km away, at 56 ft elevation (33 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Chula Vista, CA (used) | 56 ft | — | — |
| Imperial Beach Ream Fld Nas, CA | 24 ft | — | — |
| San Diego Brown Fld, CA | 515 ft | Jan 6 | Dec 31 |
| North Island Nas, CA | 26 ft | — | — |
Frost dates near Imperial Beach
- Imperial Beach, CA 91932 · last —, first —
- San Diego, CA 92154 · last —, first —
- Chula Vista, CA 91911 · last —, first —
- San Ysidro, CA 92173 · last —, first —
- National City, CA 91950 · last —, first —
- Bonita, CA 91908 · last —, first —
- Coronado, CA 92118 · last —, first —
- Lemon Grove, CA 91945 · last —, first —
Frequently asked questions
- When is the last frost in Imperial Beach, CA?
- Frost occurs in about 7% of years at the nearest NOAA station (Chula Vista, CA), so there is no reliable average last frost date.
- When is the first frost in Imperial Beach, CA?
- Frost occurs in about 7% 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.