Olathe, KS 66051 Frost Dates
66051, near Olathe, KS: the frost window
Typically, the last spring freeze lands around 04/10, roughly 225 days out. Fall's first freeze usually shows up around 10/29, roughly 202 days after the last spring frost.
Olathe sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Olathe's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/10 isn't a guarantee
04/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/24 and only about 1 year in 10 sees frost after that.
Olathe against the rest of the dataset
About 202 days separate Olathe's last and first frost, putting it 17,092 of 40,283 ZIP codes nationally. Within KS, it ranks 72 of 745.
Learn more
Two guides worth reading on 66051: zone vs. frost date, on why Zone 6b and Olathe's frost date answer different questions, and the frost range, on how to read the range around Olathe's dates instead of trusting one.