Alexandria, VA 22036 Frost Dates
Alexandria, VA: when does the frost end?
Typically, the last spring freeze lands around 04/03, roughly 218 days out. Fall's first freeze usually shows up around 11/08, roughly 217 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Alexandria in Zone 7b (5 to 10°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 10 weeks until Alexandria's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/03 isn't a guarantee
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/15 and only about 1 year in 10 sees frost after that.
Alexandria against the rest of the dataset
Alexandria's growing season runs about 217 days, ranking 13,388 of 40,283 US ZIP codes measured here, longest to shortest. Within VA, it ranks 297 of 1,178.
Learn more
Before leaning on 22036's figures: local microclimates explains what one yard in Alexandria can differ from the 22036 normal, while zone vs. frost date explains why Zone 7b and Alexandria's frost date answer different questions.