Frost Dates for 55709 — Bovey, Minnesota

Half of springs at Grand Rpds Forest Lab, MN see their last 32°F night by May 17; only one in ten is past it by May 3, and one in ten still has one after May 31. Planting tender crops after May 23 leaves a 30% risk of a frost on them, after May 26 20%, and after May 31 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 37% of the 142 Minnesota stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 24 in half of years, as early as September 10 one year in ten, and holds off past October 7 one year in ten. A hard freeze of 28°F follows 11 days later, around October 5; in spring the one-in-ten date for 28°F is May 19, 12 days before the 32°F one. The freeze-free season lasts 130 days in a typical year, shorter than at 92% of the 142 Minnesota stations; it reaches 149 days one year in ten and falls short of 110 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 12 days longer, to about May 29, and return around September 15. Severe cold of 16°F or below comes every winter, usually between November 8 and April 6.

July is the warmest month at Grand Rpds Forest Lab, MN, averaging 80°F by day and 55°F at night; January is the coldest at 19°F and -1°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month.

Warmth for growing adds up to 1,866 growing degree days a year (base 50°F), fewer than at 87% of the 142 Minnesota stations. 31% of them (576) have built up by the end of June, and July adds the most, 544. Precipitation totals 29.4 inches a year, most in June (4.7") and least in February (0.9"); May to September bring 63% of it.

The nearest other station, Pokegama Dam, MN, 12 miles southwest of Bovey, has a last frost 1 day earlier (May 16), a first frost 7 days later (October 1), a season 8 days longer.

The first measurable snow (0.1 inch or more) in Bovey usually arrives around October 29, and the last of the season around April 24. Those are the middle dates across the winters of 1991–2020 at Grand Rpds Forest Lab, MN, 10.2 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 55709 is 10 miles from Grand Rpds Forest Lab, MN, which stands at 1,310 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 55744 (Grand Rapids). The 2023 USDA Plant Hardiness Zone Map lists ZIP 55709 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.