Manassas, VA 20181 Frost Dates
Frost dates for Manassas, VA, ZIP 20181
Around 04/15 is the usual last spring frost, about 230 days away. The first fall frost typically arrives around 10/24, about 194 frost-free days later.
The USDA Plant Hardiness Zone Map puts Manassas in Zone 7a (0 to 5°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 7a around Manassas has about 8 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 04/15 isn't a guarantee
04/15 is the middle of 30 years of NOAA records, not a promise. Plant by 03/31 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 Manassas compares
At roughly 194 frost-free days, Manassas places 19,424 of 40,283 ZIP codes in this dataset. Within VA, it ranks 752 of 1,178.
Learn more
the frost range explains how to read the range around Manassas's dates instead of trusting one, and local microclimates explains what one yard in Manassas can differ from the 20181 normal.