Washington, MO 63073 Frost Dates
Washington, MO: when does the frost end?
Typically, the last spring freeze lands around 04/08, roughly 223 days out. Fall's first freeze usually shows up around 10/25, roughly 199 days after the last spring frost.
Washington sits in USDA Zone 6b (-5 to 0°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
With roughly 8 weeks until Washington's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Washington's last frost
04/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/22 and only about 1 year in 10 sees frost after that.
Washington against the rest of the dataset
At roughly 199 frost-free days, Washington places 18,047 of 40,283 ZIP codes in this dataset. Within MO, it ranks 416 of 1,129.
Learn more
Before leaning on 63073's figures: local microclimates explains what one yard in Washington can differ from the 63073 normal, while zone vs. frost date explains why Zone 6b and Washington's frost date answer different questions.