Frost dates / Wisconsin / Eau Claire

Frost dates in Eau Claire, WI

The station on this page is EAU CLAIRE 3SW, WI US (USC00472425), 2.4 miles from the city point. Population in the Census 2024 estimate is 72,331.

Zone 4bUSDA average annual extreme minimum -25°F to -20°F, from ZIP 54703 (1.7 miles from the city point used on this page).

Median last 32°F is April 24. Median first 32°F is October 14. The 50% growing-season length is 170 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%	April 9	Earlier date. A last 32°F on or after this day is common.
50%	April 24	Median.
10%	May 7	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%	September 26	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 14	Median.
90%	October 28	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%	192
50%	170
90%	149

28°F threshold

	10%	50%	90%
Last, on or after	April 30	April 14	April 1
First, on or before	October 10	October 26	November 7
Season at least	212 days	192 days	171 days

36°F threshold

	10%	50%	90%
Last, on or after	May 17	May 5	April 20
First, on or before	September 19	October 3	October 17
Season at least	167 days	150 days	130 days

Station EAU CLAIRE 3SW, WI US (USC00472425). Completeness flag R, 10 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 268.2 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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Eau Claire, WI

Zone 4bAverage annual extreme minimum -25°F to -20°F

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

Wisconsin. Nearest qualified station: EAU CLAIRE 3SW, WI US (USC00472425), 2.4 miles. Median last 32°F April 24. Median first 32°F October 14. The 50% growing-season length is 170 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 7	April 24	April 9
First 32°F on or before	September 26	October 14	October 28

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 Wisconsin 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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