Occoquan, VA 22191 Frost Dates
22191, near Occoquan, VA: the frost window
Typically, the last spring freeze lands around 03/28, roughly 212 days out. Fall's first freeze usually shows up around 11/08, roughly 226 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Occoquan in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Occoquan's growing season runs out in roughly 10 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 Occoquan's last frost
03/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/08 and only about 1 year in 10 sees frost after that.
Occoquan against the rest of the dataset
About 226 days separate Occoquan's last and first frost, putting it 11,243 of 40,283 ZIP codes nationally. Within VA, it ranks 147 of 1,178.
Learn more
Two guides worth reading on 22191: zone vs. frost date, on why Zone 7b and Occoquan's frost date answer different questions, and the frost range, on how to read the range around Occoquan's dates instead of trusting one.