Capitol Heights, MD 20020 Frost Dates
Frost dates for Capitol Heights, MD, ZIP 20020
Typically, the last spring freeze lands around 03/29, roughly 213 days out. The first fall frost typically arrives around 11/08, about 224 frost-free days later.
The USDA Plant Hardiness Zone Map puts Capitol Heights in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7b around Capitol Heights has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 03/29 isn't a guarantee
03/29 is the middle of 30 years of NOAA records, not a promise. Plant by 03/15 and you're betting against frost in roughly 9 years out of 10. 04/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Capitol Heights compares
At roughly 224 frost-free days, Capitol Heights places 11,865 of 40,283 ZIP codes in this dataset. Within MD, it ranks 125 of 583.
Learn more
local microclimates explains what one yard in Capitol Heights can differ from the 20020 normal, and zone vs. frost date explains why Zone 7b and Capitol Heights's frost date answer different questions.