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Will it freeze in Rockville in the next 7 nights?
No overnight lows at or below 32°F are forecast in Rockville during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 59°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 59°F Above 36°F · Chance Showers And Thunderstorms
- Fri, Nov 6 48°F Above 36°F · Mostly Cloudy
- Sat, Nov 7 43°F Above 36°F · Mostly Clear
- Sun, Nov 8 41°F Above 36°F · Mostly Clear
- Mon, Nov 9 39°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 Rockville
The median first fall hard-freeze date (28°F) is November 19, from NOAA’s 1991–2020 Climate Normals at Rockville 1 NE. 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 | Mar 31 · Apr 16 · May 5 | Oct 12 · Oct 25 · Nov 7 | 192 days |
| 32°F freeze | Mar 19 · Apr 1 · Apr 15 | Oct 24 · Nov 6 · Nov 21 | 219 days |
| 28°F hard freeze | Mar 5 · Mar 22 · Apr 4 | Nov 5 · Nov 19 · Dec 6 | 243 days |
Average high temperature by month
1991–2020 normals at Rockville 1 NE
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 Rockville, MD come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Rockville 1 NE (station USC00187705, elevation 440 ft), 1.2 mi from Rockville. 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 Rockville
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Gaithersburg, MD | 5.0 mi | Apr 1 | Nov 6 |
| Takoma Park, MD | 11 mi | Mar 29 | Nov 8 |
| College Park, MD | 13 mi | Apr 10 | Nov 1 |
| Hyattsville, MD | 14 mi | Mar 29 | Nov 8 |
| Falls Church, VA | 14 mi | Apr 9 | Oct 31 |
| Vienna, VA | 14 mi | Apr 14 | Oct 29 |
| Mount Rainier, MD | 14 mi | Mar 29 | Nov 8 |
| Poolesville, MD | 14 mi | Apr 13 | Oct 26 |
| Washington, DC | 14 mi | Mar 29 | Nov 8 |
| Herndon, VA | 15 mi | Apr 15 | Oct 24 |
Frequently asked questions
When is the last frost in Rockville?
On average, the last spring frost (32°F) in Rockville is around April 1. In about 1 year in 10 it comes after April 15, and in 9 years in 10 it comes after March 19.
When is the first frost in Rockville?
The first fall frost (32°F) usually arrives around November 6. There’s a 10% chance of a freeze by October 24 and a 90% chance by November 21.
Can it frost in Rockville 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 16.
What growing zone is Rockville?
Rockville 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 20850. See growing zones in Maryland.
More: all Maryland frost dates · Maryland growing zones · UV index today in Rockville · frost vs. freeze