Frost dates / Kansas / Olathe

Frost dates in Olathe, KS

The station on this page is OLATHE 3E, KS US (USC00145972), 3.2 miles from the city point. Population in the Census 2024 estimate is 149,035.

Zone 6bUSDA average annual extreme minimum -5°F to 0°F, from ZIP 66061 (3.3 miles from the city point used on this page).

Median last 32°F is April 10. Median first 32°F is October 29. The 50% growing-season length is 202 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	March 27	Earlier date. A last 32°F on or after this day is common.
50%	April 10	Median.
10%	April 24	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	October 13	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 29	Median.
90%	November 12	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	223
50%	202
90%	181

28°F threshold

	10%	50%	90%
Last, on or after	April 17	March 31	March 13
First, on or before	October 23	November 6	November 25
Season at least	246 days	223 days	201 days

36°F threshold

	10%	50%	90%
Last, on or after	May 2	April 19	April 5
First, on or before	October 2	October 20	October 31
Season at least	200 days	181 days	160 days

Station OLATHE 3E, KS US (USC00145972). Completeness flag R, 17 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 321.6 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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Olathe, KS

Zone 6bAverage annual extreme minimum -5°F to 0°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Kansas. Nearest qualified station: OLATHE 3E, KS US (USC00145972), 3.2 miles. Median last 32°F April 10. Median first 32°F October 29. The 50% growing-season length is 202 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 24	April 10	March 27
First 32°F on or before	October 13	October 29	November 12

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

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Planting calendar

Frost dates for Kansas are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.

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