Haven, KS 67543 Frost Dates
67543, near Haven, 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 10/18, roughly 180 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 Haven, not a forecast for this year.
Stretching the season past the first frost
Haven'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.
Why 04/21 isn't a guarantee
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/04 and only about 1 year in 10 sees frost after that.
Haven against the rest of the dataset
Haven's growing season runs about 180 days, ranking 24,944 of 40,283 US ZIP codes measured here, longest to shortest. Within KS, it ranks 516 of 745.
Learn more
Two guides worth reading on 67543: zone vs. frost date, on why Zone 6b and Haven's frost date answer different questions, and the frost range, on how to read the range around Haven's dates instead of trusting one.