Washington, DC 20590 Frost Dates
20590, near Washington, DC: the frost window
The last spring frost here typically falls around 03/24, about 208 days from today. Fall's first freeze usually shows up around 11/18, roughly 241 days after the last spring frost.
Washington 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.
Stretching the season past the first frost
Washington's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
03/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/06 and only about 1 year in 10 sees frost after that.
Washington against the rest of the dataset
About 241 days separate Washington's last and first frost, putting it 8,467 of 40,283 ZIP codes nationally. Within DC, it ranks 48 of 246.
Learn more
Two guides worth reading on 20590: zone vs. frost date, on why Zone 8a and Washington's frost date answer different questions, and the frost range, on how to read the range around Washington's dates instead of trusting one.