Frost Dates for 53507 — Barneveld, Wisconsin

Half of springs at Dodgeville 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 17. Planting tender crops after May 9 leaves a 30% risk of a frost on them, after May 12 20%, and after May 17 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 October 7 in half of years, as early as September 25 one year in ten, and holds off past October 20 one year in ten. A hard freeze of 28°F follows 11 days later, around October 18; in spring the one-in-ten date for 28°F is May 6, 11 days before the 32°F one. The freeze-free season lasts 157 days in a typical year, longer than at 53% of the 182 Wisconsin stations; it reaches 175 days one year in ten and falls short of 138 one year in ten. On average 160 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 10 days longer, to about May 13, and return around September 29. Severe cold of 16°F or below comes every winter, usually between November 17 and March 21.

July is the warmest month at Dodgeville Wwtp, WI, averaging 81°F by day and 60°F at night; January is the coldest at 26°F and 9°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 58% of years.

Warmth for growing adds up to 2,485 growing degree days a year (base 50°F), more than at 56% of the 182 Wisconsin stations. 33% of them (816) have built up by the end of June, and July adds the most, 643. Precipitation totals 39.7 inches a year, most in June (5.7") and least in January (1.5"); May to September bring 58% of it.

The nearest other station, Mazomanie Wwtp, WI, 12 miles north of Barneveld and 354 feet lower, has a last frost 4 days later (May 7), a first frost 6 days earlier (October 1), a season 9 days shorter.

The first measurable snow (0.1 inch or more) in Barneveld usually arrives around November 22, and the last of the season around March 25. Those are the middle dates across the winters of 1991–2020 at Dodgeville Wwtp, WI, 11.4 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 39 days after the last snow.

ZIP 53507 is 11 miles from Dodgeville Wwtp, WI, which stands at 1,118 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 53533 (Dodgeville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 53507 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.