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First and last freeze dates in Bozeman, MT

The first freeze of fall (a low of 32°F or colder) typically comes around Sep 14, and the last freeze of spring around May 31.

This fall so far (data through Oct 16, 2026): first freeze (32°F or colder) Sep 27 at this station. Observed data, can lag a day or two.

Sep 14Median first fall freeze (≤32°F)

May 31Median last spring freeze (≤32°F)

105Median freeze-free days between

First and last freeze dates in Bozeman

Threshold	Event	Median date	Typical range (10th–90th pct)	Earliest / latest	Years with one
32°F or colder (freeze)	First in fall	Sep 14	Sep 3 – Sep 27	Aug 23 (2015) / Oct 11 (2010)	100%
32°F or colder (freeze)	Last in spring	May 31	May 14 – Jun 13	–	100%
28°F or colder (hard freeze)	First in fall	Oct 3	Sep 14 – Oct 16	Sep 6 (1996) / Oct 26 (2007)	100%
28°F or colder (hard freeze)	Last in spring	May 11	Apr 28 – May 25	–	100%

Based on the station’s daily minimum temperature, 1995–2024. “Freeze” here means a daily low at or below the threshold, which is not the same as visible frost. Your yard can differ by several degrees and days from an airport weather station, so use these as planning odds, not guarantees.

The median stretch between the last spring freeze and the first fall freeze (the freeze-free season) was about 105 days.

Nearby weather stations

Source station: Bozeman Gallatin Fld Ap (USW00024132), elevation 4,431 ft. Data: NOAA NCEI GHCN-Daily. Computed by First Snow Dates; how we calculate this. Historical averages only; for a forecast see weather.gov.

Planning for winter? Heat pump vs gas furnace, propane and oil: heating cost in Montana (on our sister site PlugVsPump, from EIA prices).