When is the last frost in Noxon, MT?

Frost is possible in any month at the nearest NOAA station (Libby 32 Sse, MT), so there is no reliable average last frost date.

When is the first frost in Noxon, 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 59853Noxon, MT

Frost is possible in any month near Noxon, based on NOAA 1991-2020 records for the Libby 32 Sse, 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)	—	—	19 days	100%
Frost / freeze (32°F)	—	—	44 days	100%
Hard freeze (28°F)	—	—	93 days	100%

Where these dates come from

ZIP code 59853 is matched to the NOAA station Libby 32 Sse, MT, 49.7 km away, at 3,440 ft elevation (2,072 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Libby 32 Sse, MT (used)	3,440 ft	—	—
Heron 2 Nw, MT	2,240 ft	May 20	Sep 20
Cabinet Gorge, ID	2,173 ft	May 9	Oct 8
Trout Creek Rs, MT	2,356 ft	May 20	Sep 21

Frost dates near Noxon

Heron, MT 59844 · last May 20, first Sep 20
Clark Fork, ID 83811 · last May 9, first Oct 8
Hope, ID 83836 · last May 8, first Sep 28
Trout Creek, MT 59874 · last May 20, first Sep 21
Libby, MT 59923 · last May 23, first Sep 21
Troy, MT 59935 · last May 14, first Sep 25
Murray, ID 83874 · last May 5, first Oct 2
Bayview, ID 83803 · last May 22, first Sep 22

Frequently asked questions

When is the last frost in Noxon, MT?: Frost is possible in any month at the nearest NOAA station (Libby 32 Sse, MT), so there is no reliable average last frost date.
When is the first frost in Noxon, 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.