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Will it freeze in Thurmont in the next 7 nights?
No overnight lows at or below 32°F are forecast in Thurmont during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 57°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 57°F Above 36°F · Chance Rain Showers then Mostly Cloudy
- Fri, Nov 6 48°F Above 36°F · Partly Cloudy
- Sat, Nov 7 43°F Above 36°F · Partly Cloudy
- Sun, Nov 8 41°F Above 36°F · Mostly Clear
- Mon, Nov 9 40°F Above 36°F · Mostly Clear
- Tue, Nov 10 41°F Above 36°F · Mostly Clear
- Wed, Nov 11 38°F Above 36°F · 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 Thurmont
The median first fall hard-freeze date (28°F) is November 8, from NOAA’s 1991–2020 Climate Normals at Catoctin Mountain Park. 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 13 · Apr 27 · May 12 | Oct 5 · Oct 20 · Nov 1 | 175 days |
| 32°F freeze | Apr 2 · Apr 14 · Apr 30 | Oct 14 · Oct 30 · Nov 11 | 197 days |
| 28°F hard freeze | Mar 23 · Apr 4 · Apr 17 | Oct 25 · Nov 8 · Nov 26 | 218 days |
Average high temperature by month
1991–2020 normals at Catoctin Mountain Park
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 Thurmont, MD come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Catoctin Mountain Park (station USC00181530, elevation 1,610 ft), 4.3 mi from Thurmont. 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 Thurmont
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Walkersville, MD | 11 mi | Apr 2 | Nov 6 |
| Frederick, MD | 12 mi | Apr 2 | Nov 6 |
| Taneytown, MD | 13 mi | Apr 22 | Oct 20 |
| Waynesboro, PA | 13 mi | Apr 25 | Oct 19 |
| Middletown, MD | 14 mi | Apr 2 | Nov 6 |
| Hagerstown, MD | 17 mi | Apr 11 | Oct 28 |
| Gettysburg, PA | 17 mi | Apr 24 | Oct 21 |
| Westminster, MD | 22 mi | Apr 24 | Oct 20 |
| Mount Airy, MD | 22 mi | Apr 14 | Oct 29 |
| Brunswick, MD | 24 mi | Apr 26 | Oct 18 |
Frequently asked questions
When is the last frost in Thurmont?
On average, the last spring frost (32°F) in Thurmont is around April 14. In about 1 year in 10 it comes after April 30, and in 9 years in 10 it comes after April 2.
When is the first frost in Thurmont?
The first fall frost (32°F) usually arrives around October 30. There’s a 10% chance of a freeze by October 14 and a 90% chance by November 11.
Can it frost in Thurmont 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 27.
What growing zone is Thurmont?
Thurmont 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 21788. See growing zones in Maryland.
More: all Maryland frost dates · Maryland growing zones · frost vs. freeze