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Will it freeze in Olney 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 44°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 44°F Above 36°F · Mostly Cloudy
- Fri, Nov 6 33°F Frost possible · Mostly Clear
- Sat, Nov 7 32°F Freeze · Mostly Clear
- Sun, Nov 8 34°F Frost possible · Clear
- Mon, Nov 9 39°F Above 36°F · Mostly Clear
- Tue, Nov 10 39°F Above 36°F · Mostly Clear
- Wed, Nov 11 39°F Above 36°F · Mostly Clear
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 Olney
The median first fall hard-freeze date (28°F) is November 1, from NOAA’s 1991–2020 Climate Normals at Olney 2S. 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 11 · Apr 26 · May 13 | Sep 29 · Oct 13 · Oct 26 | 168 days |
| 32°F freeze | Apr 1 · Apr 15 · May 3 | Oct 8 · Oct 23 · Nov 3 | 189 days |
| 28°F hard freeze | Mar 19 · Apr 3 · Apr 18 | Oct 17 · Nov 1 · Nov 15 | 211 days |
Average high temperature by month
1991–2020 normals at Olney 2S
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 Olney, IL come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Olney 2S (station USC00116446, elevation 459 ft), 1.9 mi from Olney. 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 Olney
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Robinson, IL | 27 mi | Apr 13 | Oct 22 |
| Mount Carmel, IL | 27 mi | Apr 2 | Oct 31 |
| Vincennes, IN | 31 mi | Apr 11 | Oct 26 |
| Effingham, IL | 37 mi | Apr 13 | Oct 24 |
| Princeton, IN | 37 mi | Apr 13 | Oct 25 |
| Salem, IL | 48 mi | Apr 9 | Oct 26 |
| Washington, IN | 50 mi | Apr 10 | Oct 25 |
| Charleston, IL | 53 mi | Apr 15 | Oct 23 |
| Mount Vernon, IL | 53 mi | Apr 11 | Oct 22 |
| Mattoon, IL | 54 mi | Apr 11 | Oct 29 |
Frequently asked questions
When is the last frost in Olney?
On average, the last spring frost (32°F) in Olney is around April 15. In about 1 year in 10 it comes after May 3, and in 9 years in 10 it comes after April 1.
When is the first frost in Olney?
The first fall frost (32°F) usually arrives around October 23. There’s a 10% chance of a freeze by October 8 and a 90% chance by November 3.
Can it frost in Olney 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 26.
What growing zone is Olney?
Olney is in USDA Plant Hardiness Zone 6b (average annual extreme minimum temperature −5 to 0°F), based on the 2023 USDA map for ZIP code 62450. See growing zones in Illinois.
More: all Illinois frost dates · Illinois growing zones · frost vs. freeze