Frost dates for Rockville, Maryland
In a typical year, Rockville’s last spring frost lands around Apr 1 and the first fall frost around Nov 6, a growing season of about 219 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 7b.
Right now the growing season is open, with about 12 days until the typical first fall frost.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Mar 19 | Oct 24 |
| 50 percent | Apr 1 | Nov 6 |
| 90 percent | Apr 15 | Nov 21 |
A 10 percent year is an early year, a 90 percent year a late one. Frost-sensitive planting usually waits for the 90 percent side of the last-frost band.
Soil in Rockville is typically around 55°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Rockville
- Garlic (Music)
Timing comes from the same temperature engine the app uses, run against Rockville’s normals for today.
Common questions
When is the last frost in Rockville, Maryland?
Rockville’s last spring frost falls around April 1 in a typical year. One year in ten it is done by March 19, and one year in ten frost holds on until April 15. Frost-sensitive planting usually waits for the late side of that band.
When is the first fall frost in Rockville?
The first fall frost arrives around November 6 in a typical year, as early as October 24 in an early year and as late as November 21 in a late one.
How long is the growing season in Rockville?
About 219 days, counted between the typical last spring frost and the typical first fall frost.
What USDA zone is Rockville in?
Rockville is in USDA hardiness zone 7b under the 2023 USDA Plant Hardiness Zone Map.
Dates come from 30-year NOAA climate normals for the nearest reporting station. They describe odds, not a forecast.
Nearby cities
- Gaithersburg, MD (around Apr 1 to Nov 6)
- Washington, DC (around Mar 29 to Nov 8)
- Alexandria, VA (around Mar 24 to Nov 18)
- Frederick, MD (around Apr 2 to Nov 6)
- Baltimore, MD (around Mar 24 to Nov 21)
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