Brunswick, MD 21777 Frost Dates
21777, near Brunswick, MD: the frost window
Typically, the last spring freeze lands around 04/02, roughly 217 days out. Fall's first freeze usually shows up around 11/06, roughly 218 days after the last spring frost.
Brunswick sits in USDA Zone 7a (0 to 5°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.
Stretching the season past the first frost
Brunswick's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Brunswick's last frost
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/15 and only about 1 year in 10 sees frost after that.
Brunswick against the rest of the dataset
Brunswick's growing season runs about 218 days, ranking 13,247 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 256 of 583.
Learn more
Two guides worth reading on 21777: zone vs. frost date, on why Zone 7a and Brunswick's frost date answer different questions, and the frost range, on how to read the range around Brunswick's dates instead of trusting one.