Frost Dates for 49712 — Boyne City, Michigan

Half of springs at Boyne Falls, MI see their last 32°F night by May 23; only one in ten is past it by May 4, and one in ten still has one after June 6. Planting tender crops after May 29 leaves a 30% risk of a frost on them, after June 1 20%, and after June 6 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 80% of the 172 Michigan stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 3 in half of years, as early as September 16 one year in ten, and holds off past October 19 one year in ten. A hard freeze of 28°F follows 13 days later, around October 16; in spring the one-in-ten date for 28°F is May 27, 10 days before the 32°F one. The freeze-free season lasts 133 days in a typical year, shorter than at 81% of the 172 Michigan stations; it reaches 156 days one year in ten and falls short of 112 one year in ten. On average 160 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 June 2, and return around September 19. Severe cold of 16°F or below comes every winter, usually between November 22 and April 4.

July is the warmest month at Boyne Falls, MI, averaging 84°F by day and 58°F at night; January is the coldest at 28°F and 14°F. A freezing night is all but certain in every month from October to May (a 90% chance or more). From July to August the chance of a 32°F night stays under 10% each month. In spring, June still brings one in 21% of years.

Warmth for growing adds up to 2,556 growing degree days a year (base 50°F), more than at 58% of the 172 Michigan stations. 32% of them (813) have built up by the end of June, and July adds the most, 645. Precipitation totals 36.5 inches a year, most in October (4.4") and least in February (1.7"); May to September bring 46% of it.

The nearest other station, E Jordan, MI, 7 miles southwest of Boyne City, has the same 50% last-frost date, a first frost 1 day earlier (October 2), a season 2 days shorter.

The first measurable snow (0.1 inch or more) in Boyne City usually arrives around November 7, and the last of the season around April 13. Those are the middle dates across the winters of 1991–2020 at Boyne Falls, MI, 5.7 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 40 days after the last snow.

ZIP 49712 is 6 miles from Boyne Falls, MI, which stands at 728 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 49712 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.