Preston, MD 21655 Frost Dates
Preston, MD: when does the frost end?
The last spring frost here typically falls around 04/01, about 216 days from today. Fall's first freeze usually shows up around 11/07, roughly 220 days after the last spring frost.
Preston 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.
Stretching the season past the first frost
With roughly 10 weeks until Preston's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/01 isn't a guarantee
04/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/18 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.
Preston against the rest of the dataset
About 220 days separate Preston's last and first frost, putting it 12,871 of 40,283 ZIP codes nationally. Within MD, it ranks 191 of 583.
Learn more
Before leaning on 21655's figures: the frost range explains how to read the range around Preston's dates instead of trusting one, while local microclimates explains what one yard in Preston can differ from the 21655 normal.