Olathe, KS 66063 Frost Dates
When can you plant in Olathe, KS?
Typically, the last spring freeze lands around 04/10, roughly 225 days out. The first fall frost typically arrives around 10/29, about 202 frost-free days later.
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.
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.
The actual range around Olathe's last frost
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 17,094 of 40,283 US ZIP codes measured here, longest to shortest. Within KS, it ranks 74 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.