Frost Dates for 54228 — Mishicot, Wisconsin

Half of springs at Two Rivers, WI see their last 32°F night by April 27; only one in ten is past it by April 14, and one in ten still has one after May 10. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 5 20%, and after May 10 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 84% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 21 in half of years, as early as October 4 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 11 days later, around November 1; in spring the one-in-ten date for 28°F is April 27, 13 days before the 32°F one. The freeze-free season lasts 175 days in a typical year, longer than at 89% of the 182 Wisconsin stations; it reaches 196 days one year in ten and falls short of 153 one year in ten. On average 140 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 11 days longer, to about May 8, and return around October 8. Severe cold of 16°F or below comes every winter, usually between November 26 and March 20.

August is the warmest month at Two Rivers, WI, averaging 76°F by day and 60°F at night; January is the coldest at 27°F and 12°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 36% of years.

Warmth for growing adds up to 1,933 growing degree days a year (base 50°F), fewer than at 89% of the 182 Wisconsin stations. 23% of them (445) have built up by the end of June, and August adds the most, 553. Precipitation totals 32.0 inches a year, most in June (4.2") and least in February (1.5"); May to September bring 52% of it.

The nearest other station, Denmark Wwtp, WI, 10 miles northwest of Mishicot and 222 feet higher, has a last frost 9 days later (May 6), a first frost 9 days earlier (October 12), a season 17 days shorter.

The first measurable snow (0.1 inch or more) in Mishicot usually arrives around December 1, and the last of the season around March 19. Those are the middle dates across the winters of 1991–2020 at Two Rivers, WI, 8.8 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 39 days after the last snow.

ZIP 54228 is 9 miles from Two Rivers, WI, which stands at 589 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 54241 (Two Rivers). The 2023 USDA Plant Hardiness Zone Map lists ZIP 54228 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.