Checking current alerts… View NWS forecast and alerts.
Will it freeze in Long Grove in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 32°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 38°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 38°F Above 36°F · Chance Rain Showers then Mostly Cloudy
- Fri, Nov 6 32°F Freeze · Partly Cloudy
- Sat, Nov 7 34°F Frost possible · Partly Cloudy
- Sun, Nov 8 35°F Frost possible · Mostly Clear
- Mon, Nov 9 41°F Above 36°F · Mostly Clear
- Tue, Nov 10 38°F Above 36°F · Partly Cloudy
- Wed, Nov 11 39°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 Long Grove
The median first fall hard-freeze date (28°F) is October 31, from NOAA’s 1991–2020 Climate Normals at Mundelein 4 Wsw. 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 25 · May 10 · May 26 | Sep 24 · Oct 9 · Oct 22 | 149 days |
| 32°F freeze | Apr 14 · Apr 29 · May 15 | Oct 4 · Oct 20 · Nov 1 | 172 days |
| 28°F hard freeze | Apr 2 · Apr 16 · May 4 | Oct 16 · Oct 31 · Nov 12 | 196 days |
Average high temperature by month
1991–2020 normals at Mundelein 4 Wsw
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 Long Grove, IL come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Mundelein 4 Wsw (station USC00115961, elevation 840 ft), 5.4 mi from Long Grove. 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 Long Grove
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Buffalo Grove, IL | 3.1 mi | Apr 19 | Oct 26 |
| Vernon Hills, IL | 3.7 mi | Apr 29 | Oct 20 |
| Lake Zurich, IL | 3.7 mi | Apr 29 | Oct 20 |
| Hawthorn Woods, IL | 4.3 mi | Apr 29 | Oct 20 |
| Lincolnshire, IL | 5.0 mi | Apr 19 | Oct 26 |
| Mundelein, IL | 5.6 mi | Apr 29 | Oct 20 |
| Palatine, IL | 5.6 mi | Apr 25 | Oct 19 |
| Wheeling, IL | 6.2 mi | Apr 19 | Oct 26 |
| Libertyville, IL | 6.8 mi | Apr 29 | Oct 20 |
| Barrington, IL | 6.8 mi | Apr 25 | Oct 19 |
Frequently asked questions
When is the last frost in Long Grove?
On average, the last spring frost (32°F) in Long Grove is around April 29. In about 1 year in 10 it comes after May 15, and in 9 years in 10 it comes after April 14.
When is the first frost in Long Grove?
The first fall frost (32°F) usually arrives around October 20. There’s a 10% chance of a freeze by October 4 and a 90% chance by November 1.
Can it frost in Long Grove 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 10.
What growing zone is Long Grove?
Long Grove is in USDA Plant Hardiness Zone 5b (average annual extreme minimum temperature −15 to −10°F), based on the 2023 USDA map for ZIP code 60047. See growing zones in Illinois.
More: all Illinois frost dates · Illinois growing zones · frost vs. freeze