Gaithersburg, MD 20914 Frost Dates
Frost dates for Gaithersburg, MD, ZIP 20914
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.
Gaithersburg sits in USDA Zone 7b (5 to 10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 7b around Gaithersburg has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
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
At roughly 219 frost-free days, Gaithersburg places 12,947 of 40,283 ZIP codes in this dataset. Within MD, it ranks 220 of 583.
Learn more
zone vs. frost date explains why Zone 7b and Gaithersburg's frost date answer different questions, and the frost range explains how to read the range around Gaithersburg's dates instead of trusting one.