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Will it freeze in Ionia in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Sat, Nov 7: 30°F (Sat, Nov 7, 6:00 PM EST to Sun, Nov 8, 6:00 AM EST).
Tonight: forecast low 37°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
5 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 37°F Above 36°F · Chance Rain Showers then Mostly Cloudy
- Fri, Nov 6 33°F Frost possible · Chance Rain Showers then Mostly Cloudy
- Sat, Nov 7 30°F Freeze · Mostly Clear
- Sun, Nov 8 33°F Frost possible · Mostly Clear
- Mon, Nov 9 41°F Above 36°F · Mostly Clear
- Tue, Nov 10 34°F Frost possible · Partly Cloudy
- Wed, Nov 11 33°F Frost possible · 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 Ionia
The median first fall hard-freeze date (28°F) is October 27, from NOAA’s 1991–2020 Climate Normals at Ionia 2SSW. 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 | Apr 30 · May 16 · Jun 1 | Sep 18 · Oct 1 · Oct 15 | 139 days |
| 32°F freeze | Apr 17 · May 3 · May 21 | Sep 29 · Oct 12 · Oct 27 | 161 days |
| 28°F hard freeze | Apr 7 · Apr 22 · May 9 | Oct 7 · Oct 27 · Nov 10 | 186 days |
Average high temperature by month
1991–2020 normals at Ionia 2SSW
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 Ionia, MI come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Ionia 2SSW (station USC00204078, elevation 805 ft), 1.7 mi from Ionia. 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 Ionia
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Belding, MI | 12 mi | May 18 | Sep 28 |
| Greenville, MI | 17 mi | May 18 | Sep 28 |
| Grand Ledge, MI | 23 mi | May 1 | Oct 13 |
| Hastings, MI | 25 mi | May 3 | Oct 12 |
| St. Johns, MI | 26 mi | Apr 28 | Oct 24 |
| Rockford, MI | 27 mi | May 14 | Sep 29 |
| Kentwood, MI | 27 mi | Apr 30 | Oct 14 |
| East Grand Rapids, MI | 27 mi | May 6 | Oct 10 |
| Grand Rapids, MI | 29 mi | May 6 | Oct 10 |
| Charlotte, MI | 31 mi | May 1 | Oct 15 |
Frequently asked questions
When is the last frost in Ionia?
On average, the last spring frost (32°F) in Ionia is around May 3. In about 1 year in 10 it comes after May 21, and in 9 years in 10 it comes after April 17.
When is the first frost in Ionia?
The first fall frost (32°F) usually arrives around October 12. There’s a 10% chance of a freeze by September 29 and a 90% chance by October 27.
Can it frost in Ionia 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 16.
What growing zone is Ionia?
Ionia is in USDA Plant Hardiness Zone 6a (average annual extreme minimum temperature −10 to −5°F), based on the 2023 USDA map for ZIP code 48846. See growing zones in Michigan.
More: all Michigan frost dates · Michigan growing zones · frost vs. freeze