Fairfax, VA 22119 Frost Dates
Fairfax, VA: when does the frost end?
Around 04/14 is the usual last spring frost, about 229 days away. Fall's first freeze usually shows up around 10/29, roughly 198 days after the last spring frost.
Fairfax 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
With roughly 9 weeks until Fairfax's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/14 isn't a guarantee
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.
Fairfax against the rest of the dataset
At roughly 198 frost-free days, Fairfax places 18,335 of 40,283 ZIP codes in this dataset. Within VA, it ranks 675 of 1,178.
Learn more
Before leaning on 22119's figures: the frost range explains how to read the range around Fairfax's dates instead of trusting one, while local microclimates explains what one yard in Fairfax can differ from the 22119 normal.