Osawatomie, KS 66064 Frost Dates
66064, near Osawatomie, KS: the frost window
Around 04/14 is the usual last spring frost, about 229 days away. Fall's first freeze usually shows up around 10/25, roughly 192 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Osawatomie in Zone 6b (-5 to 0°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
Osawatomie's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/14 isn't a guarantee
04/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/29 and only about 1 year in 10 sees frost after that.
Osawatomie against the rest of the dataset
Osawatomie's growing season runs about 192 days, ranking 20,301 of 40,283 US ZIP codes measured here, longest to shortest. Within KS, it ranks 253 of 745.
Learn more
Two guides worth reading on 66064: zone vs. frost date, on why Zone 6b and Osawatomie's frost date answer different questions, and the frost range, on how to read the range around Osawatomie's dates instead of trusting one.