Manassas, VA 20112 Frost Dates
Frost dates for Manassas, VA, ZIP 20112
Around 03/28 is the usual last spring frost, about 212 days away. The first fall frost typically arrives around 11/08, about 226 frost-free days later.
Manassas sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 7a around Manassas 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.
How much risk comes with planting early here
03/28 is the middle of 30 years of NOAA records, not a promise. Plant by 03/14 and you're betting against frost in roughly 9 years out of 10. 04/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Manassas compares
Manassas's growing season runs about 226 days, ranking 11,135 of 40,283 US ZIP codes measured here, longest to shortest. Within VA, it ranks 125 of 1,178.
Learn more
local microclimates explains what one yard in Manassas can differ from the 20112 normal, and zone vs. frost date explains why Zone 7a and Manassas's frost date answer different questions.