Frost Dates for 53037 — Jackson, Wisconsin

Half of springs at Jackson, WI see their last 32°F night by April 30; only one in ten is past it by April 15, and one in ten still has one after May 15. Planting tender crops after May 6 leaves a 30% risk of a frost on them, after May 10 20%, and after May 15 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 30% of the 182 Wisconsin stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 15 in half of years, as early as October 1 one year in ten, and holds off past October 29 one year in ten. A hard freeze of 28°F follows 12 days later, around October 27; in spring the one-in-ten date for 28°F is May 1, 14 days before the 32°F one. The freeze-free season lasts 167 days in a typical year, longer than at 79% of the 182 Wisconsin stations; it reaches 187 days one year in ten and falls short of 147 one year in ten. On average 146 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 12, and return around October 4. Severe cold of 16°F or below comes every winter, usually between November 25 and March 18.

July is the warmest month at Jackson, WI, averaging 82°F by day and 60°F at night; January is the coldest at 28°F and 13°F. A freezing night is all but certain in every month from October 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 48% of years.

Warmth for growing adds up to 2,545 growing degree days a year (base 50°F), more than at 64% of the 182 Wisconsin stations. 31% of them (778) have built up by the end of June, and July adds the most, 655. Precipitation totals 32.7 inches a year, most in June (4.0") and least in January (1.4"); May to September bring 54% of it.

The nearest other station, W Bend Public Works, WI, 6 miles north of Jackson, has a last frost 1 day later (May 1), a first frost 3 days earlier (October 12), a season 6 days shorter.

The first measurable snow (0.1 inch or more) in Jackson usually arrives around November 17, and the last of the season around April 9. Those are the middle dates across the winters of 1991–2020 at Germantown, WI, 6.2 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 53037 is under a mile from Jackson, WI, which stands at 903 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 53037 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.