Frost dates for 59927Olney, MT
Frost is possible in any month near Olney, based on NOAA 1991-2020 records for the Olney, MT 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) | — | — | 29 days | 100% |
| Frost / freeze (32°F) | — | — | 60 days | 100% |
| Hard freeze (28°F) | May 9 · May 25 · Jun 12 | Aug 26 · Sep 10 · Sep 26 | 107 days | 100% |
Where these dates come from
ZIP code 59927 is matched to the NOAA station Olney, MT, 1.4 km away, at 3,165 ft elevation (188 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Olney, MT (used) | 3,165 ft | — | — |
| Whitefish, MT | 3,100 ft | May 16 | Sep 25 |
| Polebridge, MT | 3,520 ft | — | — |
| Fortine 1 N, MT | 3,000 ft | May 16 | Sep 18 |
Frost dates near Olney
- Stryker, MT 59933 · last —, first —
- Whitefish, MT 59937 · last May 16, first Sep 25
- Trego, MT 59934 · last May 16, first Sep 18
- Fortine, MT 59918 · last May 16, first Sep 18
- Polebridge, MT 59928 · last —, first —
- Columbia Falls, MT 59912 · last May 31, first Sep 10
- Kalispell, MT 59903 · last May 16, first Sep 25
- Coram, MT 59913 · last May 18, first Sep 20
Frequently asked questions
- When is the last frost in Olney, MT?
- Frost is possible in any month at the nearest NOAA station (Olney, MT), so there is no reliable average last frost date.
- When is the first frost in Olney, MT?
- 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.