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Will it freeze in Zionsville in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 31°F (Fri, Nov 6, 6:00 PM EST to Sat, Nov 7, 6:00 AM EST).
Tonight: forecast low 40°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
5 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 40°F Above 36°F · Cloudy then Light Rain Likely
- Fri, Nov 6 31°F Freeze · Partly Cloudy
- Sat, Nov 7 30°F Freeze · Partly Cloudy
- Sun, Nov 8 32°F Freeze · Mostly Clear
- Mon, Nov 9 37°F Above 36°F · Clear
- Tue, Nov 10 36°F Frost possible · Mostly Clear
- Wed, Nov 11 36°F Frost possible · 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 Zionsville
The median first fall hard-freeze date (28°F) is October 31, from NOAA’s 1991–2020 Climate Normals at Whitestown. 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 18 · May 1 · May 17 | Sep 25 · Oct 8 · Oct 21 | 159 days |
| 32°F freeze | Apr 6 · Apr 21 · May 6 | Oct 5 · Oct 20 · Nov 1 | 180 days |
| 28°F hard freeze | Mar 25 · Apr 9 · Apr 25 | Oct 16 · Oct 31 · Nov 13 | 204 days |
Average high temperature by month
1991–2020 normals at Whitestown
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 Zionsville, IN come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Whitestown (station USC00129557, elevation 941 ft), 1.7 mi from Zionsville. 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 Zionsville
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Whitestown, IN | 3.1 mi | Apr 21 | Oct 20 |
| Lebanon, IN | 8.1 mi | Apr 21 | Oct 20 |
| Carmel, IN | 9.3 mi | Apr 21 | Oct 21 |
| Westfield, IN | 9.3 mi | Apr 21 | Oct 21 |
| Brownsburg, IN | 11 mi | Apr 12 | Oct 29 |
| Sheridan, IN | 14 mi | Apr 23 | Oct 17 |
| Speedway, IN | 14 mi | Apr 12 | Oct 29 |
| Avon, IN | 16 mi | Apr 12 | Oct 29 |
| Noblesville, IN | 17 mi | Apr 21 | Oct 21 |
| Indianapolis, IN | 17 mi | Apr 20 | Oct 21 |
Frequently asked questions
When is the last frost in Zionsville?
On average, the last spring frost (32°F) in Zionsville is around April 21. In about 1 year in 10 it comes after May 6, and in 9 years in 10 it comes after April 6.
When is the first frost in Zionsville?
The first fall frost (32°F) usually arrives around October 20. There’s a 10% chance of a freeze by October 5 and a 90% chance by November 1.
Can it frost in Zionsville 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 1.
What growing zone is Zionsville?
Zionsville 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 46075. See growing zones in Indiana.
More: all Indiana frost dates · Indiana growing zones · UV index today in Zionsville · frost vs. freeze