Williamsburg, VA 23178 Frost Dates
Frost dates for Williamsburg, VA, ZIP 23178
Around 04/01 is the usual last spring frost, about 216 days away. The first fall frost typically arrives around 11/10, about 223 frost-free days later.
Williamsburg sits in USDA Zone 8a (10 to 15°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.
What to do before the first frost
Zone 8a around Williamsburg has about 11 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.
Why 04/01 isn't a guarantee
04/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/20 and you're betting against frost in roughly 9 years out of 10. 04/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Williamsburg compares
At roughly 223 frost-free days, Williamsburg places 12,035 of 40,283 ZIP codes in this dataset. Within VA, it ranks 207 of 1,178.
Learn more
zone vs. frost date explains why Zone 8a and Williamsburg's frost date answer different questions, and the frost range explains how to read the range around Williamsburg's dates instead of trusting one.