Frost Dates for 55325 — Dassel, Minnesota

Half of springs at Dassel 3SE, MN see their last 32°F night by April 30; only one in ten is past it by April 16, 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 12 days between the even-odds date and the one-in-ten date is narrower than at 85% of the 142 Minnesota 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 22 one year in ten. A hard freeze of 28°F follows 11 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 162 days in a typical year, longer than at 81% of the 142 Minnesota stations; it reaches 180 days one year in ten and falls short of 144 one year in ten. On average 158 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 8, and return around October 1. Severe cold of 16°F or below comes every winter, usually between November 13 and March 29.

July is the warmest month at Dassel 3SE, MN, averaging 82°F by day and 62°F at night; January is the coldest at 21°F and 2°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 2,636 growing degree days a year (base 50°F), more than at 75% of the 142 Minnesota stations. 33% of them (882) have built up by the end of June, and July adds the most, 686. Precipitation totals 28.9 inches a year, most in June (4.4") and least in January (0.6"); May to September bring 64% of it.

The nearest other station, Litchfield, MN, 11 miles west of Dassel, has a last frost 6 days later (May 6), a first frost 8 days earlier (October 2), a season 15 days shorter.

The first measurable snow (0.1 inch or more) in Dassel usually arrives around November 16, and the last of the season around April 1. Those are the middle dates across the winters of 1991–2020 at Dassel 3SE, MN, 3.9 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 29 days after the last snow.

ZIP 55325 is 4 miles from Dassel 3SE, MN, which stands at 1,065 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 55321 (Cokato). The 2023 USDA Plant Hardiness Zone Map lists ZIP 55325 in zone 4b, the band where the coldest night of the year averaged -25 to -20°F (-31.7 to -28.9°C) over 1991–2020; a zone describes winter lows, not frost dates.