Gaithersburg, MD 20879 Frost Dates
When can you plant in Gaithersburg, MD?
The last spring frost here typically falls around 04/01, about 216 days from today. 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 Gaithersburg, not a forecast for this year.
What to do before the first frost
About 10 weeks of growing season left in Gaithersburg before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Gaithersburg'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 Gaithersburg compares
Gaithersburg's growing season runs about 219 days, ranking 12,935 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 208 of 583.
Learn more
the frost range covers how to read the range around Gaithersburg's dates instead of trusting one. local microclimates covers what one yard in Gaithersburg can differ from the 20879 normal.