Havre de Grace, MD 21078 Frost Dates
Frost dates for Havre de Grace, MD, ZIP 21078
Typically, the last spring freeze lands around 04/10, roughly 225 days out. The first fall frost typically arrives around 10/30, about 201 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 Havre de Grace, not a forecast for this year.
What to do before the first frost
Zone 7b around Havre de Grace has about 9 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 Havre de Grace's last frost
04/10 is the middle of 30 years of NOAA records, not a promise. Plant by 03/27 and you're betting against frost in roughly 9 years out of 10. 04/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Havre de Grace compares
At roughly 201 frost-free days, Havre de Grace places 17,465 of 40,283 ZIP codes in this dataset. Within MD, it ranks 446 of 583.
Learn more
local microclimates explains what one yard in Havre de Grace can differ from the 21078 normal, and zone vs. frost date explains why Zone 7b and Havre de Grace's frost date answer different questions.