Olathe, KS 66251 Frost Dates
Olathe, KS: when does the frost end?
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.
The USDA Plant Hardiness Zone Map puts Olathe 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
With roughly 9 weeks until Olathe's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Olathe's last frost
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
At roughly 202 frost-free days, Olathe places 17,098 of 40,283 ZIP codes in this dataset. Within KS, it ranks 78 of 745.
Learn more
Before leaning on 66251's figures: zone vs. frost date explains why Zone 6b and Olathe's frost date answer different questions, while the frost range explains how to read the range around Olathe's dates instead of trusting one.