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Will it freeze in Bozeman in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 28°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).
Tonight: forecast low 28°F. Hard freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
6 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 28°F Hard freeze · Slight Chance Light Rain then Partly Cloudy
- Fri, Nov 6 32°F Freeze · Partly Cloudy
- Sat, Nov 7 34°F Frost possible · Partly Cloudy
- Sun, Nov 8 34°F Frost possible · Mostly Cloudy
- Mon, Nov 9 36°F Frost possible · Mostly Cloudy
- Tue, Nov 10 35°F Frost possible · Partly Cloudy
- Wed, Nov 11 37°F Above 36°F · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Bozeman
The median first fall hard-freeze date (28°F) is October 3, from NOAA’s 1991–2020 Climate Normals at Bozeman Montana State University. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | May 28 · Jun 14 · Jun 28 | Aug 26 · Sep 8 · Sep 23 | 87 days |
| 32°F freeze | May 9 · May 26 · Jun 14 | Sep 5 · Sep 22 · Oct 5 | 116 days |
| 28°F hard freeze | Apr 23 · May 8 · May 26 | Sep 18 · Oct 3 · Oct 19 | 147 days |
Average high temperature by month
1991–2020 normals at Bozeman Montana State University
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Bozeman, MT come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Bozeman Montana State University (station USC00241044, elevation 4,913 ft), 1.5 mi from Bozeman. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Bozeman
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Belgrade, MT | 9.3 mi | May 26 | Sep 16 |
| Livingston, MT | 24 mi | May 27 | Sep 14 |
| Helena, MT | 78 mi | May 9 | Sep 30 |
| Butte, MT | 79 mi | Jun 13 | Sep 5 |
| Anaconda, MT | 104 mi | Jun 1 | Sep 14 |
| Laurel, MT | 110 mi | May 5 | Oct 3 |
| Billings, MT | 121 mi | May 4 | Oct 7 |
| Lewistown, MT | 122 mi | May 23 | Sep 21 |
| Cody, WY | 126 mi | May 12 | Oct 1 |
| Great Falls, MT | 126 mi | May 6 | Oct 1 |
Frequently asked questions
When is the last frost in Bozeman?
On average, the last spring frost (32°F) in Bozeman is around May 26. In about 1 year in 10 it comes after June 14, and in 9 years in 10 it comes after May 9.
When is the first frost in Bozeman?
The first fall frost (32°F) usually arrives around September 22. There’s a 10% chance of a freeze by September 5 and a 90% chance by October 5.
Can it frost in Bozeman after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after June 14.
What growing zone is Bozeman?
Bozeman is in USDA Plant Hardiness Zone 5a (average annual extreme minimum temperature −20 to −15°F), based on the 2023 USDA map for ZIP code 59718. See growing zones in Montana.
More: all Montana frost dates · Montana growing zones · UV index today in Bozeman · frost vs. freeze