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Will it freeze in Jacksonville in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 28°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 39°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 39°F Above 36°F · Slight Chance Drizzle then Cloudy
- Fri, Nov 6 28°F Hard freeze · Mostly Clear
- Sat, Nov 7 31°F Freeze · Mostly Clear
- Sun, Nov 8 34°F Frost possible · Clear
- Mon, Nov 9 39°F Above 36°F · Clear
- Tue, Nov 10 39°F Above 36°F · Mostly Clear
- Wed, Nov 11 40°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 Jacksonville
The median first fall hard-freeze date (28°F) is October 31, from NOAA’s 1991–2020 Climate Normals at Jacksonville 2. 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 14 · Apr 27 · May 11 | Sep 27 · Oct 12 · Oct 23 | 167 days |
| 32°F freeze | Apr 3 · Apr 17 · May 1 | Oct 9 · Oct 21 · Nov 1 | 186 days |
| 28°F hard freeze | Mar 22 · Apr 6 · Apr 21 | Oct 18 · Oct 31 · Nov 14 | 208 days |
Average high temperature by month
1991–2020 normals at Jacksonville 2
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 Jacksonville, IL come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Jacksonville 2 (station USC00114447, elevation 626 ft), 1.1 mi from Jacksonville. 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 Jacksonville
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Beardstown, IL | 22 mi | Apr 16 | Oct 23 |
| Chatham, IL | 29 mi | Apr 15 | Oct 22 |
| Springfield, IL | 32 mi | Apr 15 | Oct 22 |
| Carlinville, IL | 37 mi | Apr 14 | Oct 21 |
| Jerseyville, IL | 43 mi | Apr 14 | Oct 19 |
| Litchfield, IL | 48 mi | Apr 13 | Oct 24 |
| Taylorville, IL | 50 mi | Apr 12 | Oct 20 |
| Godfrey, IL | 53 mi | Apr 4 | Nov 5 |
| Lincoln, IL | 54 mi | Apr 20 | Oct 16 |
| Hillsboro, IL | 56 mi | Apr 13 | Oct 24 |
Frequently asked questions
When is the last frost in Jacksonville?
On average, the last spring frost (32°F) in Jacksonville is around April 17. In about 1 year in 10 it comes after May 1, and in 9 years in 10 it comes after April 3.
When is the first frost in Jacksonville?
The first fall frost (32°F) usually arrives around October 21. There’s a 10% chance of a freeze by October 9 and a 90% chance by November 1.
Can it frost in Jacksonville 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 27.
What growing zone is Jacksonville?
Jacksonville 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 62650. See growing zones in Illinois.
More: all Illinois frost dates · Illinois growing zones · frost vs. freeze