Westminster, MD 21048 Frost Dates
21048, near Westminster, MD: the frost window
The last spring frost here typically falls around 04/19, about 234 days from today. Fall's first freeze usually shows up around 10/25, roughly 188 days after the last spring frost.
Westminster 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
Westminster's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/19 isn't a guarantee
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Westminster against the rest of the dataset
Westminster's growing season runs about 188 days, ranking 21,869 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 525 of 583.
Learn more
Two guides worth reading on 21048: the frost range, on how to read the range around Westminster's dates instead of trusting one, and local microclimates, on what one yard in Westminster can differ from the 21048 normal.