Frost Dates for 54935 — Fond Du Lac, Wisconsin

Half of springs at Fond Du Lac 2 SW, WI see their last 32°F night by April 27; only one in ten is past it by April 13, and one in ten still has one after May 11. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 5 20%, and after May 11 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 58% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 19 in half of years, as early as October 2 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 12 days later, around October 31; in spring the one-in-ten date for 28°F is April 28, 13 days before the 32°F one. The freeze-free season lasts 174 days in a typical year, longer than at 88% of the 182 Wisconsin stations; it reaches 195 days one year in ten and falls short of 153 one year in ten. On average 141 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 10 days longer, to about May 7, and return around October 6. Severe cold of 16°F or below comes every winter, usually between November 26 and March 18.

July is the warmest month at Fond Du Lac 2 SW, WI, averaging 82°F by day and 63°F at night; January is the coldest at 26°F and 12°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 35% of years.

Warmth for growing adds up to 2,724 growing degree days a year (base 50°F), more than at 86% of the 182 Wisconsin stations. 33% of them (889) have built up by the end of June, and July adds the most, 700. Precipitation totals 32.4 inches a year, most in June (4.5") and least in February (1.3"); May to September bring 57% of it.

The nearest other station, Fond Du Lac Wwtp, WI, 2 miles northwest of Fond Du Lac, has a last frost 4 days later (May 1), a first frost 7 days earlier (October 12), a season 12 days shorter.

The first measurable snow (0.1 inch or more) in Fond Du Lac usually arrives around November 22, and the last of the season around April 3. Those are the middle dates across the winters of 1991–2020 at Fond Du Lac Wwtp, WI, 2.2 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 24 days after the last snow.

ZIP 54935 is 2 miles from Fond Du Lac 2 SW, WI, which stands at 772 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54935 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.