Manassas, VA 20168 Frost Dates
Manassas, VA: when does the frost end?
Around 04/15 is the usual last spring frost, about 230 days away. Fall's first freeze usually shows up around 10/24, roughly 194 days after the last spring frost.
Zone 7a (0 to 5°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 Manassas, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Manassas's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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 against the rest of the dataset
At roughly 194 frost-free days, Manassas places 19,423 of 40,283 ZIP codes in this dataset. Within VA, it ranks 751 of 1,178.
Learn more
Before leaning on 20168's figures: zone vs. frost date explains why Zone 7a and Manassas's frost date answer different questions, while the frost range explains how to read the range around Manassas's dates instead of trusting one.