Warrenton, VA 20187 Frost Dates
Warrenton, VA: when does the frost end?
Typically, the last spring freeze lands around 04/15, roughly 230 days out. Fall's first freeze usually shows up around 10/24, roughly 194 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Warrenton in Zone 7a (0 to 5°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
With roughly 8 weeks until Warrenton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/15 isn't a guarantee
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
Warrenton against the rest of the dataset
About 194 days separate Warrenton's last and first frost, putting it 19,462 of 40,283 ZIP codes nationally. Within VA, it ranks 767 of 1,178.
Learn more
Before leaning on 20187's figures: local microclimates explains what one yard in Warrenton can differ from the 20187 normal, while zone vs. frost date explains why Zone 7a and Warrenton's frost date answer different questions.