Frost Dates for 53011 — Cascade, Wisconsin

Half of springs at Plymouth Wwtp, WI see their last 32°F night by May 3; only one in ten is past it by April 19, and one in ten still has one after May 20. Planting tender crops after May 10 leaves a 30% risk of a frost on them, after May 15 20%, and after May 20 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 90% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 10 in half of years, as early as September 28 one year in ten, and holds off past October 25 one year in ten. A hard freeze of 28°F follows 13 days later, around October 23; in spring the one-in-ten date for 28°F is May 5, 15 days before the 32°F one. The freeze-free season lasts 159 days in a typical year, longer than at 59% of the 182 Wisconsin stations; it reaches 179 days one year in ten and falls short of 138 one year in ten. On average 151 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 15 days longer, to about May 18, and return around September 30. Severe cold of 16°F or below comes every winter, usually between November 24 and March 22.

July is the warmest month at Plymouth Wwtp, WI, averaging 81°F by day and 60°F at night; January is the coldest at 26°F and 12°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 60% of years.

Warmth for growing adds up to 2,391 growing degree days a year (base 50°F), fewer than at 54% of the 182 Wisconsin stations. 30% of them (725) have built up by the end of June, and July adds the most, 639. Precipitation totals 33.5 inches a year, most in June (4.2") and least in February (1.4"); May to September bring 54% of it.

The nearest other station, Hingham Wwtp, WI, 9 miles east of Cascade, has the same 50% last-frost date, a first frost 6 days later (October 16), a season 6 days longer.

The first measurable snow (0.1 inch or more) in Cascade usually arrives around November 22, and the last of the season around April 10. Those are the middle dates across the winters of 1991–2020 at Plymouth Wwtp, 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 23 days after the last snow.

ZIP 53011 is 7 miles from Plymouth Wwtp, WI, which stands at 828 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 53073 (Plymouth). The 2023 USDA Plant Hardiness Zone Map lists ZIP 53011 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.