Frost Dates for 56750 — Red Lake Falls, Minnesota

Half of springs at Red Lake Falls, MN see their last 32°F night by May 9; only one in ten is past it by April 27, and one in ten still has one after May 24. Planting tender crops after May 15 leaves a 30% risk of a frost on them, after May 19 20%, and after May 24 10%. The 15 days between the even-odds date and the one-in-ten date is wider than at 64% of the 142 Minnesota stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 30 in half of years, as early as September 16 one year in ten, and holds off past October 11 one year in ten. A hard freeze of 28°F follows 8 days later, around October 8; in spring the one-in-ten date for 28°F is May 13, 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 161 days one year in ten and falls short of 123 one year in ten. On average 182 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 20, and return around September 20. Severe cold of 16°F or below comes every winter, usually between November 6 and April 4.

July is the warmest month at Red Lake Falls, MN, averaging 79°F by day and 58°F at night; January is the coldest at 15°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 81% of years.

Warmth for growing adds up to 2,088 growing degree days a year (base 50°F), fewer than at 75% of the 142 Minnesota stations. 32% of them (670) have built up by the end of June, and July adds the most, 578. Precipitation totals 24.5 inches a year, most in June (4.5") and least in January (0.6"); May to September bring 71% of it.

The nearest other station, Crookston NW Exp Stn, MN, 16 miles west of Red Lake Falls, has a last frost 2 days later (May 11), a first frost 3 days earlier (September 27), a season 4 days shorter.

The first measurable snow (0.1 inch or more) in Red Lake Falls usually arrives around November 2, and the last of the season around April 13. Those are the middle dates across the winters of 1991–2020 at Red Lake Falls, MN, 0.6 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 26 days after the last snow.

ZIP 56750 is under a mile from Red Lake Falls, MN, which stands at 1,038 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 56750 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.