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Will it freeze in Hillsboro 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 EST to Sun, Nov 8, 6:00 AM EST).
Tonight: forecast low 43°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 43°F Above 36°F · Partly Cloudy
- Fri, Nov 6 34°F Frost possible · Partly Cloudy
- Sat, Nov 7 32°F Freeze · Partly Cloudy
- Sun, Nov 8 33°F Frost possible · Mostly Clear
- Mon, Nov 9 37°F Above 36°F · Mostly 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 Hillsboro
The median first fall hard-freeze date (28°F) is November 1, from NOAA’s 1991–2020 Climate Normals at Hillsboro. 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 21 · May 4 · May 20 | Sep 27 · Oct 10 · Oct 20 | 157 days |
| 32°F freeze | Apr 10 · Apr 24 · May 11 | Oct 6 · Oct 20 · Nov 1 | 178 days |
| 28°F hard freeze | Mar 31 · Apr 12 · Apr 29 | Oct 17 · Nov 1 · Nov 13 | 201 days |
Average high temperature by month
1991–2020 normals at Hillsboro
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 Hillsboro, OH come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Hillsboro (station USC00333758, elevation 953 ft), 1.4 mi from Hillsboro. 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 Hillsboro
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Wilmington, OH | 19 mi | Apr 17 | Oct 22 |
| Washington Court House, OH | 24 mi | Apr 23 | Oct 21 |
| Chillicothe, OH | 34 mi | Apr 20 | Oct 22 |
| South Lebanon, OH | 34 mi | Apr 23 | Oct 18 |
| Lebanon, OH | 35 mi | Apr 24 | Oct 19 |
| Loveland, OH | 35 mi | Apr 23 | Oct 18 |
| Milford, OH | 36 mi | Apr 23 | Oct 18 |
| Xenia, OH | 37 mi | Apr 18 | Oct 24 |
| Mason, OH | 38 mi | Apr 22 | Oct 18 |
| Bellbrook, OH | 39 mi | Apr 17 | Oct 26 |
Frequently asked questions
When is the last frost in Hillsboro?
On average, the last spring frost (32°F) in Hillsboro is around April 24. In about 1 year in 10 it comes after May 11, and in 9 years in 10 it comes after April 10.
When is the first frost in Hillsboro?
The first fall frost (32°F) usually arrives around October 20. There’s a 10% chance of a freeze by October 6 and a 90% chance by November 1.
Can it frost in Hillsboro 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 4.
What growing zone is Hillsboro?
Hillsboro 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 45133. See growing zones in Ohio.
More: all Ohio frost dates · Ohio growing zones · frost vs. freeze