Westminster, MD 21157 Frost Dates
When can you plant in Westminster, MD?
Around 04/19 is the usual last spring frost, about 234 days away. The first fall frost typically arrives around 10/25, about 188 frost-free days later.
Zone 7a (0 to 5°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 Westminster, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Westminster before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/19 isn't a guarantee
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Westminster compares
Westminster's growing season runs about 188 days, ranking 21,870 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 526 of 583.
Learn more
the frost range covers how to read the range around Westminster's dates instead of trusting one. local microclimates covers what one yard in Westminster can differ from the 21157 normal.