Frost Dates for 54843 — Hayward, Wisconsin

Half of springs at Hayward Municipal Airport, WI see their last 32°F night by May 23; only one in ten is past it by May 5, and one in ten still has one after June 6. Planting tender crops after May 29 leaves a 30% risk of a frost on them, after June 2 20%, and after June 6 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 22 in half of years, as early as September 5 one year in ten, and holds off past October 6 one year in ten. A hard freeze of 28°F follows 10 days later, around October 2; in spring the one-in-ten date for 28°F is May 25, 12 days before the 32°F one. The freeze-free season lasts 122 days in a typical year, shorter than at 97% of the 182 Wisconsin stations; it reaches 143 days one year in ten and falls short of 98 one year in ten. On average 188 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 June 5, and return around September 10. Severe cold of 16°F or below comes every winter, usually between November 8 and April 7.

July is the warmest month at Hayward Municipal Airport, WI, averaging 80°F by day and 55°F at night; January is the coldest at 22°F and 2°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 25% of years.

Warmth for growing adds up to 1,906 growing degree days a year (base 50°F), fewer than at 90% of the 182 Wisconsin stations. 32% of them (611) have built up by the end of June, and July adds the most, 529. Precipitation totals 31.5 inches a year, most in July (4.5") and least in January (0.6"); May to September bring 64% of it.

The nearest other station, Minong 5 WSW, WI, 25 miles west of Hayward, has a last frost 13 days earlier (May 10), a first frost 12 days later (October 4), a season 22 days longer.

The first measurable snow (0.1 inch or more) in Hayward usually arrives around November 2, and the last of the season around April 16. Those are the middle dates across the winters of 1991–2020 at Hayward Rs, WI, 7.4 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 37 days after the last snow.

ZIP 54843 is 5 miles from Hayward Municipal Airport, WI, which stands at 1,204 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 54843 in zone 4a, the band where the coldest night of the year averaged -30 to -25°F (-34.4 to -31.7°C) over 1991–2020; a zone describes winter lows, not frost dates.