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Will it freeze in Troy 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 45°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 45°F Above 36°F · Mostly Cloudy then Slight Chance Light Rain
- Fri, Nov 6 36°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 38°F Above 36°F · Mostly Clear
- Tue, Nov 10 36°F Frost possible · Mostly Clear
- Wed, Nov 11 35°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 Troy
The median first fall hard-freeze date (28°F) is November 3, from NOAA’s 1991–2020 Climate Normals at Piqua Wastewater Plant. 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 16 · Apr 29 · May 14 | Sep 30 · Oct 13 · Oct 25 | 165 days |
| 32°F freeze | Apr 5 · Apr 18 · May 5 | Oct 9 · Oct 23 · Nov 4 | 186 days |
| 28°F hard freeze | Mar 23 · Apr 5 · Apr 20 | Oct 20 · Nov 3 · Nov 18 | 209 days |
Average high temperature by month
1991–2020 normals at Piqua Wastewater Plant
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 Troy, OH come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Piqua Wastewater Plant (station USC00336650, elevation 853 ft), 6.3 mi from Troy. 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 Troy
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Tipp City, OH | 5.6 mi | Apr 16 | Oct 28 |
| Piqua, OH | 7.5 mi | Apr 18 | Oct 23 |
| Union, OH | 11 mi | Apr 16 | Oct 28 |
| Vandalia, OH | 11 mi | Apr 16 | Oct 28 |
| New Carlisle, OH | 12 mi | Apr 24 | Oct 17 |
| Englewood, OH | 13 mi | Apr 16 | Oct 28 |
| Clayton, OH | 13 mi | Apr 16 | Oct 28 |
| Huber Heights, OH | 14 mi | Apr 16 | Oct 28 |
| Brookville, OH | 17 mi | Apr 16 | Oct 28 |
| Sidney, OH | 17 mi | Apr 27 | Oct 20 |
Frequently asked questions
When is the last frost in Troy?
On average, the last spring frost (32°F) in Troy is around April 18. In about 1 year in 10 it comes after May 5, and in 9 years in 10 it comes after April 5.
When is the first frost in Troy?
The first fall frost (32°F) usually arrives around October 23. There’s a 10% chance of a freeze by October 9 and a 90% chance by November 4.
Can it frost in Troy 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 29.
What growing zone is Troy?
Troy 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 45373. See growing zones in Ohio.
More: all Ohio frost dates · Ohio growing zones · UV index today in Troy · frost vs. freeze