Olathe, KS 66061 Frost Dates
Frost dates for Olathe, KS, ZIP 66061
The last spring frost here typically falls around 04/13, about 228 days from today. The first fall frost typically arrives around 10/24, about 193 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
Zone 6b around Olathe has about 8 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.
How much risk comes with planting early here
04/13 is the middle of 30 years of NOAA records, not a promise. Plant by 03/30 and you're betting against frost in roughly 9 years out of 10. 04/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Olathe compares
Olathe's growing season runs about 193 days, ranking 19,675 of 40,283 US ZIP codes measured here, longest to shortest. Within KS, it ranks 229 of 745.
Learn more
the frost range explains how to read the range around Olathe's dates instead of trusting one, and local microclimates explains what one yard in Olathe can differ from the 66061 normal.