Frost dates for 91908Bonita, CA
Frost occurs in about 7% of years near Bonita, 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 91908 is matched to the NOAA station Chula Vista, CA, 5.6 km away, at 56 ft elevation (65 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Chula Vista, CA (used) | 56 ft | — | — |
| San Diego Brown Fld, CA | 515 ft | Jan 6 | Dec 31 |
| Imperial Beach Ream Fld Nas, CA | 24 ft | — | — |
| North Island Nas, CA | 26 ft | — | — |
Frost dates near Bonita
- Bonita, CA 91902 · last —, first —
- San Diego, CA 92139 · last —, first —
- Chula Vista, CA 91910 · last —, first —
- National City, CA 91950 · last —, first —
- Spring Valley, CA 91977 · last Jan 6, first Dec 21
- Lemon Grove, CA 91945 · last —, first —
- San Ysidro, CA 92173 · last —, first —
- Imperial Beach, CA 91933 · last —, first —
Frequently asked questions
- When is the last frost in Bonita, 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 Bonita, 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.