Frost dates for 82715Four Corners, WY
Frost is possible in any month near Four Corners, based on NOAA 1991-2020 records for the Rochford 2 Wnw, SD 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) | — | — | 63 days | 100% |
| Hard freeze (28°F) | May 21 · Jun 3 · Jun 24 | Aug 20 · Sep 5 · Sep 19 | 93 days | 100% |
Where these dates come from
ZIP code 82715 is matched to the NOAA station Rochford 2 Wnw, SD, 31.5 km away, at 5,450 ft elevation (400 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Rochford 2 Wnw, SD (used) | 5,450 ft | — | — |
| Newcastle, WY | 4,415 ft | May 13 | Oct 3 |
| Upton, WY | 4,320 ft | May 20 | Sep 23 |
| Sundance, WY | 4,695 ft | May 21 | Sep 25 |
Frost dates near Four Corners
- Osage, WY 82723 · last May 20, first Sep 23
- Newcastle, WY 82701 · last May 13, first Oct 3
- Lead, SD 57754 · last May 18, first Sep 29
- Upton, WY 82730 · last May 20, first Sep 23
- Sundance, WY 82729 · last May 21, first Sep 25
- Deadwood, SD 57732 · last May 24, first Sep 25
- Hill City, SD 57745 · last Jun 1, first Sep 10
- Nemo, SD 57759 · last May 28, first Sep 18
Frequently asked questions
- When is the last frost in Four Corners, WY?
- Frost is possible in any month at the nearest NOAA station (Rochford 2 Wnw, SD), so there is no reliable average last frost date.
- When is the first frost in Four Corners, 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.