Olathe, KS 66285 Frost Dates
Frost dates for Olathe, KS, ZIP 66285
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.
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
Zone 6b around Olathe has about 9 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
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
About 202 days separate Olathe's last and first frost, putting it 17,102 of 40,283 ZIP codes nationally. Within KS, it ranks 82 of 745.
Learn more
local microclimates explains what one yard in Olathe can differ from the 66285 normal, and zone vs. frost date explains why Zone 6b and Olathe's frost date answer different questions.