Vienna, VA 22180 Frost Dates
22180, near Vienna, VA: the frost window
Typically, the last spring freeze lands around 04/14, roughly 229 days out. Fall's first freeze usually shows up around 10/29, roughly 198 days after the last spring frost.
Zone 7b (5 to 10°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 Vienna, not a forecast for this year.
Stretching the season past the first frost
Vienna's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Vienna's last frost
04/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/28 and only about 1 year in 10 sees frost after that.
Vienna against the rest of the dataset
At roughly 198 frost-free days, Vienna places 18,368 of 40,283 ZIP codes in this dataset. Within VA, it ranks 696 of 1,178.
Learn more
Two guides worth reading on 22180: zone vs. frost date, on why Zone 7b and Vienna's frost date answer different questions, and the frost range, on how to read the range around Vienna's dates instead of trusting one.