Herndon, VA 20171 Frost Dates
When can you plant in Herndon, VA?
The last spring frost here typically falls around 04/15, about 230 days from today. The first fall frost typically arrives around 10/24, about 194 frost-free days later.
Herndon 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.
What to do before the first frost
About 8 weeks of growing season left in Herndon before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Herndon's last frost
04/15 is the middle of 30 years of NOAA records, not a promise. Plant by 03/31 and you're betting against frost in roughly 9 years out of 10. 04/30 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Herndon compares
At roughly 194 frost-free days, Herndon places 19,442 of 40,283 ZIP codes in this dataset. Within VA, it ranks 760 of 1,178.
Learn more
zone vs. frost date covers why Zone 7b and Herndon's frost date answer different questions. the frost range covers how to read the range around Herndon's dates instead of trusting one.