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Will it freeze in International Falls in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 20°F (Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST).
Tonight: forecast low 20°F. Hard freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 20°F Hard freeze · Partly Cloudy
- Fri, Nov 6 22°F Hard freeze · Partly Cloudy
- Sat, Nov 7 30°F Freeze · Mostly Clear
- Sun, Nov 8 31°F Freeze · Mostly Cloudy
- Mon, Nov 9 30°F Freeze · Mostly Clear
- Tue, Nov 10 27°F Hard freeze · Mostly Cloudy
- Wed, Nov 11 27°F Hard freeze · 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 International Falls
The median first fall hard-freeze date (28°F) is September 26, from NOAA’s 1991–2020 Climate Normals at Intl Falls Intl 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 | rare in most years | rare in most years | 76 days |
| 32°F freeze | May 13 · May 29 · Jun 16 | Aug 30 · Sep 13 · Sep 28 | 109 days |
| 28°F hard freeze | Apr 30 · May 14 · May 30 | Sep 9 · Sep 26 · Oct 9 | 133 days |
Average high temperature by month
1991–2020 normals at Intl Falls Intl 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 International Falls, MN come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Intl Falls Intl Airport (station USW00014918, elevation 1,183 ft), 1.8 mi from International Falls. 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 International Falls
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Virginia, MN | 84 mi | May 12 | Oct 1 |
| Hibbing, MN | 85 mi | Jun 5 | Sep 8 |
| Grand Rapids, MN | 93 mi | May 17 | Sep 24 |
| Bemidji, MN | 102 mi | May 17 | Sep 26 |
| Thief River Falls, MN | 131 mi | May 14 | Sep 28 |
| Hermantown, MN | 135 mi | May 18 | Oct 1 |
| Cloquet, MN | 135 mi | May 26 | Sep 23 |
| Duluth, MN | 139 mi | May 14 | Oct 12 |
| Superior, WI | 145 mi | May 6 | Oct 9 |
| Brainerd, MN | 158 mi | May 8 | Sep 29 |
Frequently asked questions
When is the last frost in International Falls?
On average, the last spring frost (32°F) in International Falls is around May 29. In about 1 year in 10 it comes after June 16, and in 9 years in 10 it comes after May 13.
When is the first frost in International Falls?
The first fall frost (32°F) usually arrives around September 13. There’s a 10% chance of a freeze by August 30 and a 90% chance by September 28.
What growing zone is International Falls?
International Falls is in USDA Plant Hardiness Zone 3a (average annual extreme minimum temperature −40 to −35°F), based on the 2023 USDA map for ZIP code 56668. See growing zones in Minnesota.
More: all Minnesota frost dates · Minnesota growing zones · frost vs. freeze