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Will it freeze in Havre in the next 7 nights?
No overnight lows at or below 32°F are forecast in Havre during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 33°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 33°F Frost possible · Partly Cloudy
- Fri, Nov 6 40°F Above 36°F · Partly Cloudy
- Sat, Nov 7 39°F Above 36°F · Partly Cloudy
- Sun, Nov 8 36°F Frost possible · Partly Cloudy
- Mon, Nov 9 35°F Frost possible · Mostly Cloudy
- Tue, Nov 10 40°F Above 36°F · Partly Cloudy
- Wed, Nov 11 41°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 Havre
The median first fall hard-freeze date (28°F) is October 1, from NOAA’s 1991–2020 Climate Normals at Havre City County Airport. 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 16 · May 27 · Jun 11 | Aug 29 · Sep 12 · Sep 23 | 105 days |
| 32°F freeze | May 3 · May 15 · May 27 | Sep 11 · Sep 23 · Oct 5 | 129 days |
| 28°F hard freeze | Apr 20 · May 3 · May 16 | Sep 19 · Oct 1 · Oct 15 | 150 days |
Average high temperature by month
1991–2020 normals at Havre City County Airport
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 Havre, MT come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Havre City County Airport (station USW00094012, elevation 2,585 ft), 3.9 mi from Havre. 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 Havre
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Lewistown, MT | 104 mi | May 23 | Sep 21 |
| Great Falls, MT | 104 mi | May 6 | Oct 1 |
| Helena, MT | 173 mi | May 9 | Sep 30 |
| Billings, MT | 198 mi | May 4 | Oct 7 |
| Laurel, MT | 203 mi | May 5 | Oct 3 |
| Livingston, MT | 203 mi | May 27 | Sep 14 |
| Belgrade, MT | 203 mi | May 26 | Sep 16 |
| Bozeman, MT | 208 mi | May 26 | Sep 22 |
| Butte, MT | 230 mi | Jun 13 | Sep 5 |
Frequently asked questions
When is the last frost in Havre?
On average, the last spring frost (32°F) in Havre is around May 15. In about 1 year in 10 it comes after May 27, and in 9 years in 10 it comes after May 3.
When is the first frost in Havre?
The first fall frost (32°F) usually arrives around September 23. There’s a 10% chance of a freeze by September 11 and a 90% chance by October 5.
Can it frost in Havre 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 May 27.
What growing zone is Havre?
Havre is in USDA Plant Hardiness Zone 3b (average annual extreme minimum temperature −35 to −30°F), based on the 2023 USDA map for ZIP code 59501. See growing zones in Montana.
More: all Montana frost dates · Montana growing zones · frost vs. freeze