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Will it freeze in Ishpeming in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 27°F (Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST).
Tonight: forecast low 27°F. Hard freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 27°F Hard freeze · Patchy Fog
- Fri, Nov 6 24°F Hard freeze · Partly Cloudy
- Sat, Nov 7 29°F Freeze · Partly Cloudy
- Sun, Nov 8 31°F Freeze · Partly Cloudy
- Mon, Nov 9 36°F Frost possible · Partly Cloudy
- Tue, Nov 10 31°F Freeze · Slight Chance Rain Showers then Partly Cloudy
- Wed, Nov 11 30°F Freeze · Slight Chance Rain And Snow Showers
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 Ishpeming
The median first fall hard-freeze date (28°F) is October 7, from NOAA’s 1991–2020 Climate Normals at Ishpeming Wastewater Plant. 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 24 · Jun 5 · Jun 27 | Aug 23 · Sep 9 · Sep 28 | 93 days |
| 32°F freeze | May 10 · May 26 · Jun 8 | Sep 4 · Sep 25 · Oct 9 | 119 days |
| 28°F hard freeze | Apr 29 · May 12 · May 27 | Sep 20 · Oct 7 · Oct 23 | 146 days |
Average high temperature by month
1991–2020 normals at Ishpeming Wastewater Plant
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 Ishpeming, MI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Ishpeming Wastewater Plant (station USC00204130, elevation 1,406 ft), 1.6 mi from Ishpeming. 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 Ishpeming
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Marquette, MI | 14 mi | May 8 | Oct 21 |
| Iron Mountain, MI | 48 mi | May 25 | Sep 24 |
| Kingsford, MI | 50 mi | May 25 | Sep 24 |
| Gladstone, MI | 53 mi | May 18 | Oct 4 |
| Escanaba, MI | 58 mi | May 13 | Oct 7 |
| Houghton, MI | 61 mi | May 17 | Oct 1 |
| Menominee, MI | 93 mi | May 4 | Oct 11 |
| Marinette, WI | 96 mi | May 4 | Oct 11 |
| Rhinelander, WI | 102 mi | May 26 | Sep 23 |
| Sturgeon Bay, WI | 115 mi | May 8 | Oct 13 |
Frequently asked questions
When is the last frost in Ishpeming?
On average, the last spring frost (32°F) in Ishpeming is around May 26. In about 1 year in 10 it comes after June 8, and in 9 years in 10 it comes after May 10.
When is the first frost in Ishpeming?
The first fall frost (32°F) usually arrives around September 25. There’s a 10% chance of a freeze by September 4 and a 90% chance by October 9.
Can it frost in Ishpeming 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 5.
What growing zone is Ishpeming?
Ishpeming is in USDA Plant Hardiness Zone 4b (average annual extreme minimum temperature −25 to −20°F), based on the 2023 USDA map for ZIP code 49849. See growing zones in Michigan.
More: all Michigan frost dates · Michigan growing zones · frost vs. freeze