Rockville, MD 20853 Frost Dates
When can you plant in Rockville, MD?
Typically, the last spring freeze lands around 04/01, roughly 216 days out. The first fall frost typically arrives around 11/06, about 219 frost-free days later.
Zone 7b (5 to 10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Rockville, not a forecast for this year.
What to do before the first frost
About 10 weeks of growing season left in Rockville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Rockville's last frost
04/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/19 and you're betting against frost in roughly 9 years out of 10. 04/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rockville compares
About 219 days separate Rockville's last and first frost, putting it 12,954 of 40,283 ZIP codes nationally. Within MD, it ranks 227 of 583.
Learn more
zone vs. frost date covers why Zone 7b and Rockville's frost date answer different questions. the frost range covers how to read the range around Rockville's dates instead of trusting one.