Frost Dates for 54204 — Brussels, Wisconsin

Half of springs at Forestville-4E, WI see their last 32°F night by May 6; only one in ten is past it by April 22, and one in ten still has one after May 20. Planting tender crops after May 12 leaves a 30% risk of a frost on them, after May 16 20%, and after May 20 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 17 in half of years, as early as October 1 one year in ten, and holds off past November 2 one year in ten. A hard freeze of 28°F follows 15 days later, around November 1; in spring the one-in-ten date for 28°F is May 7, 13 days before the 32°F one. The freeze-free season lasts 163 days in a typical year, longer than at 69% of the 182 Wisconsin stations; it reaches 183 days one year in ten and falls short of 142 one year in ten. On average 148 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 13 days longer, to about May 19, and return around October 3. Severe cold of 16°F or below comes every winter, usually between November 28 and March 23.

July is the warmest month at Forestville-4E, WI, averaging 77°F by day and 59°F at night; January is the coldest at 26°F and 11°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 71% of years.

Warmth for growing adds up to 1,976 growing degree days a year (base 50°F), fewer than at 87% of the 182 Wisconsin stations. 25% of them (498) have built up by the end of June, and July adds the most, 556. Precipitation totals 30.2 inches a year, most in August (3.8") and least in February (1.0"); May to September bring 55% of it.

The nearest other station, Sturgeon Bay Exp Farm, WI, 18 miles northeast of Brussels, has a last frost 2 days later (May 8), a first frost 4 days earlier (October 13), a season 6 days shorter.

The first measurable snow (0.1 inch or more) in Brussels usually arrives around November 28, and the last of the season around April 12. Those are the middle dates across the winters of 1991–2020 at Forestville-4E, WI, 12.8 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 54204 is 13 miles from Forestville-4E, WI, which stands at 690 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 54201 (Algoma). The 2023 USDA Plant Hardiness Zone Map lists ZIP 54204 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.