Frost Dates for 56085 — Sleepy Eye, Minnesota

Half of springs at New Ulm 2 SE, MN see their last 32°F night by April 29; only one in ten is past it by April 15, and one in ten still has one after May 12. Planting tender crops after May 4 leaves a 30% risk of a frost on them, after May 7 20%, and after May 12 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 61% of the 142 Minnesota 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 22 one year in ten, and holds off past October 23 one year in ten. A hard freeze of 28°F follows 14 days later, around October 21; in spring the one-in-ten date for 28°F is May 2, 10 days before the 32°F one. The freeze-free season lasts 161 days in a typical year, longer than at 79% of the 142 Minnesota stations; it reaches 180 days one year in ten and falls short of 141 one year in ten. On average 155 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 8 days longer, to about May 7, and return around September 28. Severe cold of 16°F or below comes every winter, usually between November 13 and March 22.

July is the warmest month at New Ulm 2 SE, MN, averaging 82°F by day and 63°F at night; January is the coldest at 24°F and 7°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 45% of years.

Warmth for growing adds up to 2,767 growing degree days a year (base 50°F), more than at 89% of the 142 Minnesota stations. 34% of them (944) have built up by the end of June, and July adds the most, 693. Precipitation totals 31.1 inches a year, most in June (5.0") and least in January (0.7"); May to September bring 65% of it.

The nearest other station, Springfield 1 NW, MN, 13 miles west of Sleepy Eye and 176 feet higher, has a last frost 5 days later (May 4), a first frost 6 days earlier (October 1), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Sleepy Eye usually arrives around November 6, and the last of the season around April 8. Those are the middle dates across the winters of 1991–2020 at New Ulm 2 SE, MN, 12.1 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 56085 is 12 miles from New Ulm 2 SE, MN, which stands at 890 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 56073 (New Ulm). The 2023 USDA Plant Hardiness Zone Map lists ZIP 56085 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.