Washington, KS 66968 Frost Dates
Washington, KS: when does the frost end?
Typically, the last spring freeze lands around 04/24, roughly 239 days out. Fall's first freeze usually shows up around 10/14, roughly 171 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Washington in Zone 6a (-10 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 7 weeks until Washington's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/24 isn't a guarantee
04/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Washington against the rest of the dataset
About 171 days separate Washington's last and first frost, putting it 28,729 of 40,283 ZIP codes nationally. Within KS, it ranks 652 of 745.
Learn more
Before leaning on 66968's figures: local microclimates explains what one yard in Washington can differ from the 66968 normal, while zone vs. frost date explains why Zone 6a and Washington's frost date answer different questions.