Frost Dates for 54520 — Crandon, Wisconsin

Half of springs at Laona 6 SW, WI see their last 32°F night by May 19; only one in ten is past it by May 5, and one in ten still has one after June 2. Planting tender crops after May 25 leaves a 30% risk of a frost on them, after May 29 20%, and after June 2 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 29 in half of years, as early as September 15 one year in ten, and holds off past October 13 one year in ten. A hard freeze of 28°F follows 10 days later, around October 9; in spring the one-in-ten date for 28°F is May 20, 13 days before the 32°F one. The freeze-free season lasts 131 days in a typical year, shorter than at 93% of the 182 Wisconsin stations; it reaches 151 days one year in ten and falls short of 111 one year in ten. On average 186 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 12 days longer, to about May 31, and return around September 19. Severe cold of 16°F or below comes every winter, usually between November 12 and April 6.

July is the warmest month at Laona 6 SW, WI, averaging 73°F by day and 55°F at night; January is the coldest at 20°F and 4°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From July to August the chance of a 32°F night stays under 10% each month. In spring, June still brings one in 12% of years.

Warmth for growing adds up to 1,541 growing degree days a year (base 50°F), the fewest of the 182 Wisconsin stations. 31% of them (483) have built up by the end of June, and July adds the most, 440. Precipitation totals 34.2 inches a year, most in June (4.7") and least in January (1.3"); May to September bring 57% of it.

The nearest other station, Antigo, WI, 27 miles south of Crandon and 176 feet lower, has a last frost 5 days earlier (May 14), a first frost 1 day later (September 30), a season 8 days longer.

The first measurable snow (0.1 inch or more) in Crandon usually arrives around October 19, and the last of the season around April 28. Those are the middle dates across the winters of 1991–2020 at Laona 6 SW, WI, 7.3 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 21 days after the last snow.

ZIP 54520 is 7 miles from Laona 6 SW, WI, which stands at 1,695 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54520 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.