Frost Dates for 54112 — Coleman, Wisconsin

Half of springs at Oconto 4 W, WI see their last 32°F night by May 9; only one in ten is past it by April 25, and one in ten still has one after May 23. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 18 20%, and after May 23 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 6 in half of years, as early as September 22 one year in ten, and holds off past October 19 one year in ten. A hard freeze of 28°F follows 11 days later, around October 17; in spring the one-in-ten date for 28°F is May 14, 9 days before the 32°F one. The freeze-free season lasts 150 days in a typical year, shorter than at 64% of the 182 Wisconsin stations; it reaches 170 days one year in ten and falls short of 130 one year in ten. On average 169 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 11 days longer, to about May 20, and return around September 26. Severe cold of 16°F or below comes every winter, usually between November 21 and March 28.

July is the warmest month at Oconto 4 W, WI, averaging 81°F by day and 59°F at night; January is the coldest at 26°F and 9°F. A freezing night is all but certain in every month from October 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 77% of years.

Warmth for growing adds up to 2,269 growing degree days a year (base 50°F), fewer than at 69% of the 182 Wisconsin stations. 31% of them (706) have built up by the end of June, and July adds the most, 604. Precipitation totals 33.8 inches a year, most in July (4.1") and least in February (1.3"); May to September bring 54% of it.

The nearest other station, Peshtigo, WI, 16 miles east of Coleman, has a last frost 2 days later (May 11), a first frost 1 day earlier (October 5), a season 5 days shorter.

The first measurable snow (0.1 inch or more) in Coleman usually arrives around November 18, and the last of the season around April 13. Those are the middle dates across the winters of 1991–2020 at Oconto 4 W, WI, 12.3 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 26 days after the last snow.

ZIP 54112 is 12 miles from Oconto 4 W, WI, which stands at 660 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 5 other ZIP codes share the station; its figures are presented in full for 54153 (Oconto). The 2023 USDA Plant Hardiness Zone Map lists ZIP 54112 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.