Manassas Park, VA 22121 Frost Dates
22121, near Manassas Park, VA: the frost window
Typically, the last spring freeze lands around 04/15, roughly 230 days out. Fall's first freeze usually shows up around 10/24, roughly 194 days after the last spring frost.
Manassas Park sits in USDA Zone 7b (5 to 10°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.
Stretching the season past the first frost
Manassas Park's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/15 isn't a guarantee
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
Manassas Park against the rest of the dataset
At roughly 194 frost-free days, Manassas Park places 19,452 of 40,283 ZIP codes in this dataset. Within VA, it ranks 765 of 1,178.
Learn more
Two guides worth reading on 22121: local microclimates, on what one yard in Manassas Park can differ from the 22121 normal, and zone vs. frost date, on why Zone 7b and Manassas Park's frost date answer different questions.