Upper Marlboro, MD 20613 Frost Dates
Frost dates for Upper Marlboro, MD, ZIP 20613
The last spring frost here typically falls around 04/03, about 218 days from today. The first fall frost typically arrives around 11/08, about 217 frost-free days later.
The USDA Plant Hardiness Zone Map puts Upper Marlboro 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 Upper Marlboro 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 Upper Marlboro's last frost
04/03 is the middle of 30 years of NOAA records, not a promise. Plant by 03/19 and you're betting against frost in roughly 9 years out of 10. 04/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Upper Marlboro compares
At roughly 217 frost-free days, Upper Marlboro places 13,580 of 40,283 ZIP codes in this dataset. Within MD, it ranks 316 of 583.
Learn more
local microclimates explains what one yard in Upper Marlboro can differ from the 20613 normal, and zone vs. frost date explains why Zone 7b and Upper Marlboro's frost date answer different questions.