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Will it freeze in Poolesville in the next 7 nights?
No overnight lows at or below 32°F are forecast in Poolesville during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 58°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
1 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 58°F Above 36°F · Chance Rain Showers
- Fri, Nov 6 47°F Above 36°F · Mostly Cloudy
- Sat, Nov 7 43°F Above 36°F · Mostly Clear
- Sun, Nov 8 40°F Above 36°F · Mostly Clear
- Mon, Nov 9 38°F Above 36°F · Mostly Clear
- Tue, Nov 10 40°F Above 36°F · 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 Poolesville
The median first fall hard-freeze date (28°F) is November 4, from NOAA’s 1991–2020 Climate Normals at WFO Sterling. 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 10 · Apr 28 · May 16 | Oct 3 · Oct 16 · Oct 30 | 172 days |
| 32°F freeze | Mar 29 · Apr 13 · May 1 | Oct 11 · Oct 26 · Nov 7 | 195 days |
| 28°F hard freeze | Mar 15 · Mar 31 · Apr 14 | Oct 22 · Nov 4 · Nov 22 | 218 days |
Average high temperature by month
1991–2020 normals at WFO Sterling
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 Poolesville, MD come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: WFO Sterling (station USC00448084, elevation 288 ft), 12 mi from Poolesville. 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 Poolesville
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Leesburg, VA | 8.1 mi | Apr 16 | Oct 25 |
| Gaithersburg, MD | 12 mi | Apr 1 | Nov 6 |
| Herndon, VA | 12 mi | Apr 15 | Oct 24 |
| Rockville, MD | 14 mi | Apr 1 | Nov 6 |
| Purcellville, VA | 16 mi | Apr 16 | Oct 25 |
| Brunswick, MD | 17 mi | Apr 26 | Oct 18 |
| Vienna, VA | 19 mi | Apr 14 | Oct 29 |
| Frederick, MD | 21 mi | Apr 2 | Nov 6 |
| Fairfax, VA | 21 mi | Apr 14 | Oct 29 |
| Mount Airy, MD | 21 mi | Apr 14 | Oct 29 |
Frequently asked questions
When is the last frost in Poolesville?
On average, the last spring frost (32°F) in Poolesville is around April 13. In about 1 year in 10 it comes after May 1, and in 9 years in 10 it comes after March 29.
When is the first frost in Poolesville?
The first fall frost (32°F) usually arrives around October 26. There’s a 10% chance of a freeze by October 11 and a 90% chance by November 7.
Can it frost in Poolesville 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 28.
What growing zone is Poolesville?
Poolesville is in USDA Plant Hardiness Zone 7b (average annual extreme minimum temperature 5 to 10°F), based on the 2023 USDA map for ZIP code 20837. See growing zones in Maryland.
More: all Maryland frost dates · Maryland growing zones · frost vs. freeze