Olathe, KS 66276 Frost Dates
When can you plant in Olathe, KS?
Around 04/10 is the usual last spring frost, about 225 days away. The first fall frost typically arrives around 10/29, about 202 frost-free days later.
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.
What to do before the first frost
About 9 weeks of growing season left in Olathe before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/10 is the middle of 30 years of NOAA records, not a promise. Plant by 03/27 and you're betting against frost in roughly 9 years out of 10. 04/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Olathe compares
Olathe's growing season runs about 202 days, ranking 17,099 of 40,283 US ZIP codes measured here, longest to shortest. Within KS, it ranks 79 of 745.
Learn more
zone vs. frost date covers why Zone 6b and Olathe's frost date answer different questions. the frost range covers how to read the range around Olathe's dates instead of trusting one.