Westminster, MD 21158 Frost Dates
Westminster, MD: when does the frost end?
Typically, the last spring freeze lands around 04/19, roughly 234 days out. Fall's first freeze usually shows up around 10/25, roughly 188 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Westminster in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 8 weeks until Westminster's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
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 21,871 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 527 of 583.
Learn more
Before leaning on 21158's figures: local microclimates explains what one yard in Westminster can differ from the 21158 normal, while zone vs. frost date explains why Zone 7a and Westminster's frost date answer different questions.