Henderson, MD 21640 Frost Dates
Frost dates for Henderson, MD, ZIP 21640
The last spring frost here typically falls around 04/04, about 219 days from today. The first fall frost typically arrives around 11/04, about 214 frost-free days later.
Zone 7b (5 to 10°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 Henderson, not a forecast for this year.
What to do before the first frost
Zone 7b around Henderson 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.
The actual range around Henderson's last frost
04/04 is the middle of 30 years of NOAA records, not a promise. Plant by 03/22 and you're betting against frost in roughly 9 years out of 10. 04/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Henderson compares
At roughly 214 frost-free days, Henderson places 14,386 of 40,283 ZIP codes in this dataset. Within MD, it ranks 334 of 583.
Learn more
the frost range explains how to read the range around Henderson's dates instead of trusting one, and local microclimates explains what one yard in Henderson can differ from the 21640 normal.