Frost Dates for 54409 — Antigo, Wisconsin

Half of springs at Antigo, WI see their last 32°F night by May 14; only one in ten is past it by April 30, and one in ten still has one after May 28. Planting tender crops after May 20 leaves a 30% risk of a frost on them, after May 23 20%, and after May 28 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 September 30 in half of years, as early as September 14 one year in ten, and holds off past October 13 one year in ten. A hard freeze of 28°F follows 11 days later, around October 11; in spring the one-in-ten date for 28°F is May 17, 11 days before the 32°F one. The freeze-free season lasts 139 days in a typical year, shorter than at 86% of the 182 Wisconsin stations; it reaches 158 days one year in ten and falls short of 119 one year in ten. On average 180 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 27, and return around September 20. Severe cold of 16°F or below comes every winter, usually between November 15 and April 3.

July is the warmest month at Antigo, WI, averaging 78°F by day and 57°F at night; January is the coldest at 21°F and 4°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 86% of years.

Warmth for growing adds up to 1,930 growing degree days a year (base 50°F), fewer than at 90% of the 182 Wisconsin stations. 31% of them (597) have built up by the end of June, and July adds the most, 536. Precipitation totals 29.3 inches a year, most in June (4.5") and least in February (0.7"); May to September bring 62% of it.

The nearest other station, Stockbridge-Munsee Rsvn, WI, 21 miles southeast of Antigo and 469 feet lower, has a last frost 1 day earlier (May 13), the same first-frost date, a season 2 days longer.

The first measurable snow (0.1 inch or more) in Antigo usually arrives around November 16, and the last of the season around April 14. Those are the middle dates across the winters of 1991–2020 at Antigo, WI, 2.9 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 30 days after the last snow.

ZIP 54409 is 3 miles from Antigo, WI, which stands at 1,519 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54409 in zone 4b, the band where the coldest night of the year averaged -25 to -20°F (-31.7 to -28.9°C) over 1991–2020; a zone describes winter lows, not frost dates.