Last frost date in Gaithersburg, Maryland
April 1
Average last frost in spring. In an early year (1 in 10) it's over by March 19; in a late year (1 in 10) it comes after April 15.
November 6
Average first frost in fall. 1 year in 10 it comes by October 24.
Source: NOAA U.S. Climate Normals 1991–2020, station Rockville 1 NE (USC00187705), 4.1 miles from Gaithersburg, elevation 440 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Rockville, so its frost dates are the same as Gaithersburg's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 19 | Apr 1 | Apr 15 |
| First frost in fall | Oct 24 | Nov 6 | Nov 21 |
Frost-free days in an average year: 219
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 16 | Oct 25 |
| Frost (32°F) | Every year | Apr 1 | Nov 6 |
| Hard freeze (28°F) | Every year | Mar 22 | Nov 19 |
Nights at 32°F or colder in an average year: 86
What to plant now in Gaithersburg
- Mustard greensAug 15 – Nov 1Now
- Garden peasSept 1 – Nov 1Now
- ParsleySept 1 – Nov 15Now
- RadishesSept 1 – Nov 15Now
- SpinachSept 15 – Nov 1Now
- Corn saladOct 1 – Dec 1Now
- Onion setsOct 1 – Dec 1Now
- Upland cressOct 1 – Dec 1Now
- Asparagus plantsDec 1 – Jan 1Soon
- Spring planting calendar for an average last frost around March 30 Gaithersburg: April 1
- Fall planting calendar for an average first frost around November 10 Gaithersburg: November 6
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Maryland
- College Park 17 mi · last frost Apr 10
- Hyattsville 18 mi · last frost Mar 29
- Laurel 18 mi · last frost Apr 5
- Frederick 23 mi · last frost Apr 2
- Bowie 28 mi · last frost Apr 22
Updated