Fairfax, VA 22183 Frost Dates
Frost dates for Fairfax, VA, ZIP 22183
Typically, the last spring freeze lands around 04/14, roughly 229 days out. The first fall frost typically arrives around 10/29, about 198 frost-free days later.
The USDA Plant Hardiness Zone Map puts Fairfax in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7b around Fairfax has about 9 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 03/30 and you're betting against frost in roughly 9 years out of 10. 04/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Fairfax compares
Fairfax's growing season runs about 198 days, ranking 18,344 of 40,283 US ZIP codes measured here, longest to shortest. Within VA, it ranks 684 of 1,178.
Learn more
the frost range explains how to read the range around Fairfax's dates instead of trusting one, and local microclimates explains what one yard in Fairfax can differ from the 22183 normal.