Frost Dates for 56671 — Red Lake, Minnesota

Half of springs at Red Lake Indian Agcy, MN see their last 32°F night by May 12; only one in ten is past it by April 29, and one in ten still has one after May 30. Planting tender crops after May 19 leaves a 30% risk of a frost on them, after May 23 20%, and after May 30 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 4 in half of years, as early as September 19 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 15; in spring the one-in-ten date for 28°F is May 19, 11 days before the 32°F one. The freeze-free season lasts 142 days in a typical year, shorter than at 73% of the 142 Minnesota stations; it reaches 164 days one year in ten and falls short of 119 one year in ten. On average 187 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 11 days longer, to about May 23, and return around September 24. Severe cold of 16°F or below comes every winter, usually between November 10 and April 7.

July is the warmest month at Red Lake Indian Agcy, MN, averaging 77°F by day and 60°F at night; January is the coldest at 16°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 82% of years.

Warmth for growing adds up to 1,958 growing degree days a year (base 50°F), fewer than at 82% of the 142 Minnesota stations. 30% of them (590) have built up by the end of June, and July adds the most, 563. Precipitation totals 22.8 inches a year, most in June (3.6") and least in December (0.4"); May to September bring 67% of it.

The nearest other station, Blackduck, MN, 32 miles southeast of Red Lake, has a last frost 12 days later (May 24), a first frost 17 days earlier (September 17), a season 27 days shorter.

The first measurable snow (0.1 inch or more) in Red Lake usually arrives around November 13, and the last of the season around April 4. Those are the middle dates across the winters of 1991–2020 at Red Lake Indian Agcy, MN, 5.9 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 38 days after the last snow.

ZIP 56671 is 6 miles from Red Lake Indian Agcy, MN, which stands at 1,216 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 56671 in zone 3b, the band where the coldest night of the year averaged -35 to -30°F (-37.2 to -34.4°C) over 1991–2020; a zone describes winter lows, not frost dates.