Olathe, KS 66250 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.
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
About 202 days separate Olathe's last and first frost, putting it 17,097 of 40,283 ZIP codes nationally. Within KS, it ranks 77 of 745.
Learn more
the frost range covers how to read the range around Olathe's dates instead of trusting one. local microclimates covers what one yard in Olathe can differ from the 66250 normal.