Frost dates / Wisconsin / Fond du Lac

Frost dates in Fond du Lac, WI

The station on this page is FOND DU LAC 2 SW, WI US (USC00472842), 1.4 miles from the city point. Population in the Census 2024 estimate is 44,469.

Zone 5bUSDA average annual extreme minimum -15°F to -10°F, from ZIP 54935 (0.4 miles from the city point used on this page).

Median last 32°F is April 27. Median first 32°F is October 19. The 50% growing-season length is 174 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 13	Earlier date. A last 32°F on or after this day is common.
50%	April 27	Median.
10%	May 11	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 2	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 19	Median.
90%	November 1	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%	195
50%	174
90%	153

28°F threshold

	10%	50%	90%
Last, on or after	April 28	April 15	April 2
First, on or before	October 16	October 31	November 13
Season at least	216 days	197 days	178 days

36°F threshold

	10%	50%	90%
Last, on or after	May 21	May 7	April 24
First, on or before	September 23	October 6	October 21
Season at least	172 days	152 days	131 days

Station FOND DU LAC 2 SW, WI US (USC00472842). Completeness flag R, 11 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 235.3 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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Fond du Lac, WI

Zone 5bAverage annual extreme minimum -15°F to -10°F

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

Wisconsin. Nearest qualified station: FOND DU LAC 2 SW, WI US (USC00472842), 1.4 miles. Median last 32°F April 27. Median first 32°F October 19. The 50% growing-season length is 174 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 11	April 27	April 13
First 32°F on or before	October 2	October 19	November 1

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.

Date checks use your device’s calendar and appear after the page loads.