Topeka, KS 66621 Frost Dates
66621, near Topeka, KS: the frost window
The last spring frost here typically falls around 04/16, about 231 days from today. Fall's first freeze usually shows up around 10/22, roughly 189 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Topeka, not a forecast for this year.
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 21,373 of 40,283 ZIP codes nationally. Within KS, it ranks 314 of 745.
Learn more
Two guides worth reading on 66621: the frost range, on how to read the range around Topeka's dates instead of trusting one, and local microclimates, on what one yard in Topeka can differ from the 66621 normal.