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Will it freeze in Mount Vernon in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 32°F (Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 6:00 AM CST).
Tonight: forecast low 32°F. Freeze.
NWS forecast period: Fri, Nov 6, 6:00 PM CST to Sat, Nov 7, 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 32°F Freeze · Clear then Areas Of Frost
- Sat, Nov 7 30°F Freeze · Widespread Frost
- Sun, Nov 8 36°F Frost possible · Clear
- Mon, Nov 9 39°F Above 36°F · Clear
- Tue, Nov 10 40°F Above 36°F · Clear
- Wed, Nov 11 41°F Above 36°F · Slight Chance Rain Showers
- Thu, Nov 12 37°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 Mount Vernon
The median first fall hard-freeze date (28°F) is November 7, from NOAA’s 1991–2020 Climate Normals at Mt Vernon. 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 21 · May 7 | Oct 1 · Oct 17 · Oct 30 | 177 days |
| 32°F freeze | Mar 25 · Apr 7 · Apr 27 | Oct 10 · Oct 28 · Nov 10 | 202 days |
| 28°F hard freeze | Mar 12 · Mar 30 · Apr 14 | Oct 24 · Nov 7 · Nov 25 | 224 days |
Average high temperature by month
1991–2020 normals at Mt Vernon
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 Mount Vernon, IN come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Mt Vernon (station USC00126001, elevation 357 ft), 0.6 mi from Mount Vernon. 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 Mount Vernon
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Henderson, KY | 19 mi | Apr 9 | Oct 26 |
| Evansville, IN | 20 mi | Mar 29 | Nov 10 |
| Princeton, IN | 34 mi | Apr 13 | Oct 25 |
| Boonville, IN | 34 mi | Apr 12 | Oct 25 |
| Mount Carmel, IL | 34 mi | Apr 2 | Oct 31 |
| Harrisburg, IL | 38 mi | Apr 7 | Oct 26 |
| Owensboro, KY | 44 mi | Apr 2 | Nov 1 |
| Madisonville, KY | 47 mi | Apr 2 | Nov 1 |
| Vincennes, IN | 55 mi | Apr 11 | Oct 26 |
| Olney, IL | 55 mi | Apr 15 | Oct 23 |
Frequently asked questions
When is the last frost in Mount Vernon?
On average, the last spring frost (32°F) in Mount Vernon is around April 7. In about 1 year in 10 it comes after April 27, and in 9 years in 10 it comes after March 25.
When is the first frost in Mount Vernon?
The first fall frost (32°F) usually arrives around October 28. There’s a 10% chance of a freeze by October 10 and a 90% chance by November 10.
Can it frost in Mount Vernon 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 21.
What growing zone is Mount Vernon?
Mount Vernon 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 47620. See growing zones in Indiana.
More: all Indiana frost dates · Indiana growing zones · frost vs. freeze