Frost Dates for 55336 — Glencoe, Minnesota

Half of springs at Brownton Wwtp, MN see their last 32°F night by April 30; only one in ten is past it by April 17, and one in ten still has one after May 13. Planting tender crops after May 6 leaves a 30% risk of a frost on them, after May 9 20%, and after May 13 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 4 in half of years, as early as September 21 one year in ten, and holds off past October 18 one year in ten. A hard freeze of 28°F follows 11 days later, around October 15; in spring the one-in-ten date for 28°F is May 3, 10 days before the 32°F one. The freeze-free season lasts 156 days in a typical year, longer than at 67% of the 142 Minnesota stations; it reaches 176 days one year in ten and falls short of 137 one year in ten. On average 164 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 10, and return around September 26. Severe cold of 16°F or below comes every winter, usually between November 12 and March 28.

July is the warmest month at Brownton Wwtp, MN, averaging 81°F by day and 61°F at night; January is the coldest at 21°F and 3°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 49% of years.

Warmth for growing adds up to 2,486 growing degree days a year (base 50°F), more than at 57% of the 142 Minnesota stations. 34% of them (845) have built up by the end of June, and July adds the most, 649. Precipitation totals 31.6 inches a year, most in June (5.2") and least in January (0.7"); May to September bring 65% of it.

The nearest other station, Hutchinson 1 N, MN, 13 miles northwest of Glencoe, has a last frost 2 days earlier (April 28), a first frost 4 days later (October 8), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Glencoe usually arrives around November 16, and the last of the season around April 5. Those are the middle dates across the winters of 1991–2020 at Brownton Wwtp, MN, 8.7 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 25 days after the last snow.

ZIP 55336 is 9 miles from Brownton Wwtp, MN, which stands at 1,040 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 55336 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.