When is the last frost in Deer Lodge, MT?

Frost is possible in any month at the nearest NOAA station (Deer Lodge 3 W, MT), so there is no reliable average last frost date.

When is the first frost in Deer Lodge, 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.

Frost dates for 59722Deer Lodge, MT

Frost is possible in any month near Deer Lodge, based on NOAA 1991-2020 records for the Deer Lodge 3 W, 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.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
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)	—	—	36 days	100%
Frost / freeze (32°F)	—	—	65 days	100%
Hard freeze (28°F)	May 11 · May 30 · Jun 20	Aug 15 · Sep 8 · Sep 24	99 days	100%

Where these dates come from

ZIP code 59722 is matched to the NOAA station Deer Lodge 3 W, MT, 3.8 km away, at 4,850 ft elevation (290 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Deer Lodge 3 W, MT (used)	4,850 ft	—	—
Elliston, MT	5,080 ft	Jun 9	Sep 8
Anaconda, MT	5,230 ft	Jun 1	Sep 14
Drummond Aviation, MT	4,000 ft	—	—

Frost dates near Deer Lodge

Garrison, MT 59731 · last —, first —
Warm Springs, MT 59756 · last —, first —
Avon, MT 59713 · last Jun 4, first Sep 14
Gold Creek, MT 59733 · last —, first —
Elliston, MT 59728 · last Jun 9, first Sep 8
Anaconda, MT 59711 · last Jun 1, first Sep 14
Hall, MT 59837 · last —, first —
Ramsay, MT 59748 · last Jun 13, first Sep 5

Frequently asked questions

When is the last frost in Deer Lodge, MT?: Frost is possible in any month at the nearest NOAA station (Deer Lodge 3 W, MT), so there is no reliable average last frost date.
When is the first frost in Deer Lodge, 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.