Jamestown, KS 66948 Frost Dates
66948, near Jamestown, KS: the frost window
The last spring frost here typically falls around 04/21, about 236 days from today. Fall's first freeze usually shows up around 10/19, roughly 177 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Jamestown 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
Jamestown's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Jamestown's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/05 and only about 1 year in 10 sees frost after that.
Jamestown against the rest of the dataset
About 177 days separate Jamestown's last and first frost, putting it 26,265 of 40,283 ZIP codes nationally. Within KS, it ranks 584 of 745.
Learn more
Two guides worth reading on 66948: local microclimates, on what one yard in Jamestown can differ from the 66948 normal, and zone vs. frost date, on why Zone 6a and Jamestown's frost date answer different questions.