Olathe, KS 66286 Frost Dates
Olathe, KS: when does the frost end?
The last spring frost here typically falls around 04/10, about 225 days from today. Fall's first freeze usually shows up around 10/29, roughly 202 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 Olathe, not a forecast for this year.
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.
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
Olathe's growing season runs about 202 days, ranking 17,103 of 40,283 US ZIP codes measured here, longest to shortest. Within KS, it ranks 83 of 745.
Learn more
Before leaning on 66286's figures: the frost range explains how to read the range around Olathe's dates instead of trusting one, while local microclimates explains what one yard in Olathe can differ from the 66286 normal.