Frost dates for 92304Amboy, CA
Frost occurs in about 31% of years near Amboy, based on NOAA 1991-2020 records for the Iron Mtn, CA station.
Frost occurs in about 31% 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 16 · Jan 10 · Feb 28 | Nov 30 · Dec 19 · Jan 20 | 343 days | 84% |
| Frost / freeze (32°F) | Dec 12 · Jan 3 · Feb 11 | Dec 6 · Dec 31 · Jan 30 | 365 days | 31% |
| Hard freeze (28°F) | — | — | 365 days | 4% |
Where these dates come from
ZIP code 92304 is matched to the NOAA station Iron Mtn, CA, 73.1 km away, at 922 ft elevation (289 ft higher than the ZIP code's center). This station is relatively far away, so local dates may differ more than usual. Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Iron Mtn, CA (used) | 922 ft | Jan 3 | Dec 31 |
| Mitchell Caverns, CA | 4,350 ft | Mar 6 | Dec 8 |
| Twentynine Palms, CA | 1,975 ft | Jan 24 | Dec 10 |
| Joshua Tree, CA | 2,563 ft | Feb 28 | Dec 1 |
Frost dates near Amboy
- Essex, CA 92332 · last Jan 3, first Dec 31
- Ludlow, CA 92338 · last Feb 19, first Nov 26
- Twentynine Palms, CA 92278 · last Jan 24, first Dec 10
- Joshua Tree, CA 92252 · last Feb 28, first Dec 1
- Yucca Valley, CA 92286 · last Mar 14, first Nov 28
- Landers, CA 92285 · last Feb 16, first Dec 10
- Cima, CA 92323 · last Mar 6, first Dec 8
- Pioneertown, CA 92268 · last Feb 16, first Dec 10
Frequently asked questions
- When is the last frost in Amboy, CA?
- Frost occurs in about 31% of years at the nearest NOAA station (Iron Mtn, CA), so there is no reliable average last frost date.
- When is the first frost in Amboy, CA?
- Frost occurs in about 31% 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.