Topeka, KS 66629 Frost Dates
66629, near Topeka, KS: the frost window
Around 04/16 is the usual last spring frost, about 231 days away. Fall's first freeze usually shows up around 10/22, roughly 189 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Topeka 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
Topeka'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 04/16 isn't a guarantee
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Topeka against the rest of the dataset
About 189 days separate Topeka's last and first frost, putting it 21,378 of 40,283 ZIP codes nationally. Within KS, it ranks 319 of 745.
Learn more
Two guides worth reading on 66629: zone vs. frost date, on why Zone 6b and Topeka's frost date answer different questions, and the frost range, on how to read the range around Topeka's dates instead of trusting one.