When is the last frost in Whitlash, MT?

Frost is possible in any month at the nearest NOAA station (Goldbutte 7 N, MT), so there is no reliable average last frost date.

When is the first frost in Whitlash, 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 59545Whitlash, MT

Frost is possible in any month near Whitlash, based on NOAA 1991-2020 records for the Goldbutte 7 N, 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)	—	—	40 days	100%
Frost / freeze (32°F)	—	—	77 days	100%
Hard freeze (28°F)	May 11 · May 25 · Jun 12	Aug 31 · Sep 16 · Oct 1	113 days	100%

Where these dates come from

ZIP code 59545 is matched to the NOAA station Goldbutte 7 N, MT, 22.5 km away, at 3,498 ft elevation (859 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Goldbutte 7 N, MT (used)	3,498 ft	—	—
Dunkirk 19Nne, MT	3,323 ft	May 23	Sep 14
Rudyard 21 N, MT	3,000 ft	May 30	Sep 11
Sunburst 8 E, MT	3,700 ft	May 17	Sep 25

Frost dates near Whitlash

Galata, MT 59444 · last May 23, first Sep 14
Joplin, MT 59531 · last May 21, first Sep 19
Inverness, MT 59530 · last May 21, first Sep 19
Sunburst, MT 59482 · last May 17, first Sep 25
Lothair, MT 59461 · last May 24, first Sep 17
Chester, MT 59522 · last May 24, first Sep 17
Rudyard, MT 59540 · last May 21, first Sep 19
Oilmont, MT 59466 · last May 17, first Sep 25

Frequently asked questions

When is the last frost in Whitlash, MT?: Frost is possible in any month at the nearest NOAA station (Goldbutte 7 N, MT), so there is no reliable average last frost date.
When is the first frost in Whitlash, 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.