Frost dates for 83414Alta, WY
Frost is possible in any month near Alta, based on NOAA 1991-2020 records for the Moran 5Wnw, WY station.
Frost is possible in any month. Even summer nights can drop to freezing at this station, so protect tender plants whenever cold nights are 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) | — | — | 32 days | 100% |
| Frost / freeze (32°F) | — | — | 61 days | 100% |
| Hard freeze (28°F) | May 19 · Jun 8 · Jun 25 | Aug 28 · Sep 11 · Sep 29 | 97 days | 100% |
Where these dates come from
ZIP code 83414 is matched to the NOAA station Moran 5Wnw, WY, 29.1 km away, at 6,805 ft elevation (1,358 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Moran 5Wnw, WY (used) | 6,805 ft | — | — |
| Alta 1 Nnw, WY | 6,440 ft | Jun 14 | Sep 11 |
| Driggs, ID | 6,120 ft | Jun 13 | Sep 9 |
| Tetonia Exp Stn, ID | 6,170 ft | Jun 15 | Sep 7 |
Frost dates near Alta
- Felt, ID 83424 · last Jun 15, first Sep 7
- Driggs, ID 83422 · last Jun 13, first Sep 9
- Tetonia, ID 83452 · last Jun 13, first Sep 9
- Moose, WY 83012 · last —, first —
- Moran, WY 83013 · last —, first —
- Victor, ID 83455 · last Jun 13, first Sep 9
- Teton Village, WY 83025 · last Jun 24, first Aug 28
- Ashton, ID 83420 · last May 21, first Sep 21
Frequently asked questions
- When is the last frost in Alta, WY?
- Frost is possible in any month at the nearest NOAA station (Moran 5Wnw, WY), so there is no reliable average last frost date.
- When is the first frost in Alta, WY?
- Frost is possible in any month 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.