Frost Dates for 56364 — Pierz, Minnesota

Half of springs at Little Falls 2NNE, MN see their last 32°F night by May 4; only one in ten is past it by April 21, and one in ten still has one after May 22. Planting tender crops after May 10 leaves a 30% risk of a frost on them, after May 14 20%, and after May 22 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 92% of the 142 Minnesota stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 5 in half of years, as early as September 22 one year in ten, and holds off past October 19 one year in ten. A hard freeze of 28°F follows 11 days later, around October 16; in spring the one-in-ten date for 28°F is May 7, 15 days before the 32°F one. The freeze-free season lasts 151 days in a typical year, shorter than at 48% of the 142 Minnesota stations; it reaches 170 days one year in ten and falls short of 131 one year in ten. On average 167 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 13 days longer, to about May 17, and return around September 26. Severe cold of 16°F or below comes every winter, usually between November 11 and March 31.

July is the warmest month at Little Falls 2NNE, MN, averaging 85°F by day and 60°F at night; January is the coldest at 24°F and 4°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 63% of years.

Warmth for growing adds up to 2,666 growing degree days a year (base 50°F), more than at 80% of the 142 Minnesota stations. 33% of them (880) have built up by the end of June, and July adds the most, 696. Precipitation totals 27.4 inches a year, most in June (4.3") and least in February (0.7"); May to September bring 64% of it.

The nearest other station, Rice, MN, 18 miles south of Pierz, has a last frost 6 days later (May 10), a first frost 6 days earlier (September 29), a season 11 days shorter.

The first measurable snow (0.1 inch or more) in Pierz usually arrives around November 23, and the last of the season around April 11. Those are the middle dates across the winters of 1991–2020 at Little Falls 2NNE, MN, 12.5 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 23 days after the last snow.

ZIP 56364 is 13 miles from Little Falls 2NNE, MN, which stands at 1,120 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 56345 (Little Falls). The 2023 USDA Plant Hardiness Zone Map lists ZIP 56364 in zone 4a, the band where the coldest night of the year averaged -30 to -25°F (-34.4 to -31.7°C) over 1991–2020; a zone describes winter lows, not frost dates.