Frost Dates for 54157 — Peshtigo, Wisconsin

Half of springs at Peshtigo, WI see their last 32°F night by May 11; only one in ten is past it by April 29, and one in ten still has one after May 26. Planting tender crops after May 18 leaves a 30% risk of a frost on them, after May 21 20%, and after May 26 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 30% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 5 in half of years, as early as September 21 one year in ten, and holds off past October 19 one year in ten. A hard freeze of 28°F follows 12 days later, around October 17; in spring the one-in-ten date for 28°F is May 13, 13 days before the 32°F one. The freeze-free season lasts 145 days in a typical year, shorter than at 75% of the 182 Wisconsin stations; it reaches 165 days one year in ten and falls short of 126 one year in ten. On average 172 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 14 days longer, to about May 25, and return around September 24. Severe cold of 16°F or below comes every winter, usually between November 21 and April 1.

July is the warmest month at Peshtigo, WI, averaging 80°F by day and 57°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 83% of years.

Warmth for growing adds up to 2,067 growing degree days a year (base 50°F), fewer than at 84% of the 182 Wisconsin stations. 30% of them (619) have built up by the end of June, and July adds the most, 573. Precipitation totals 33.4 inches a year, most in June (3.8") and least in February (1.2"); May to September bring 54% of it.

The nearest other station, Marinette, WI, 8 miles east of Peshtigo, has a last frost 7 days earlier (May 4), a first frost 6 days later (October 11), a season 15 days longer.

The first measurable snow (0.1 inch or more) in Peshtigo usually arrives around November 19, and the last of the season around April 12. Those are the middle dates across the winters of 1991–2020 at Peshtigo, WI, 2.8 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 29 days after the last snow.

ZIP 54157 is 3 miles from Peshtigo, WI, which stands at 600 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54157 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.