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Will it freeze in Herrin in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Sat, Nov 7: 32°F (Sat, Nov 7, 6:00 PM CST to Sun, Nov 8, 6:00 AM CST).
Tonight: forecast low 43°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 43°F Above 36°F · Partly Cloudy
- Fri, Nov 6 33°F Frost possible · Mostly Clear
- Sat, Nov 7 32°F Freeze · Mostly Clear
- Sun, Nov 8 35°F Frost possible · Clear
- Mon, Nov 9 38°F Above 36°F · Clear
- Tue, Nov 10 40°F Above 36°F · Mostly Clear
- Wed, Nov 11 42°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 Herrin
The median first fall hard-freeze date (28°F) is November 1, from NOAA’s 1991–2020 Climate Normals at Carbondale Sewage Plt. 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 5 · Apr 22 · May 5 | Sep 30 · Oct 13 · Oct 25 | 173 days |
| 32°F freeze | Mar 25 · Apr 9 · Apr 25 | Oct 10 · Oct 22 · Nov 2 | 195 days |
| 28°F hard freeze | Mar 11 · Mar 29 · Apr 14 | Oct 19 · Nov 1 · Nov 18 | 216 days |
Average high temperature by month
1991–2020 normals at Carbondale Sewage Plt
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 Herrin, IL come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Carbondale Sewage Plt (station USC00111265, elevation 390 ft), 8.8 mi from Herrin. 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 Herrin
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Carterville, IL | 3.7 mi | Apr 9 | Oct 22 |
| Marion, IL | 6.8 mi | Apr 9 | Oct 22 |
| West Frankfort, IL | 8.7 mi | Apr 4 | Oct 28 |
| Carbondale, IL | 12 mi | Apr 9 | Oct 22 |
| Benton, IL | 16 mi | Apr 4 | Oct 28 |
| Murphysboro, IL | 17 mi | Apr 9 | Oct 22 |
| Du Quoin, IL | 18 mi | Apr 6 | Oct 22 |
| Harrisburg, IL | 27 mi | Apr 7 | Oct 26 |
| Mount Vernon, IL | 36 mi | Apr 11 | Oct 22 |
| Chester, IL | 44 mi | Apr 8 | Oct 30 |
Frequently asked questions
When is the last frost in Herrin?
On average, the last spring frost (32°F) in Herrin is around April 9. In about 1 year in 10 it comes after April 25, and in 9 years in 10 it comes after March 25.
When is the first frost in Herrin?
The first fall frost (32°F) usually arrives around October 22. There’s a 10% chance of a freeze by October 10 and a 90% chance by November 2.
Can it frost in Herrin 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 April 22.
What growing zone is Herrin?
Herrin is in USDA Plant Hardiness Zone 7a (average annual extreme minimum temperature 0 to 5°F), based on the 2023 USDA map for ZIP code 62948. See growing zones in Illinois.
More: all Illinois frost dates · Illinois growing zones · frost vs. freeze