Frost Dates for 48654 — Rose City, Michigan

Half of springs at Lupton 1S, MI see their last 32°F night by May 21; only one in ten is past it by May 5, and one in ten still has one after June 5. Planting tender crops after May 27 leaves a 30% risk of a frost on them, after May 31 20%, and after June 5 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 55% of the 172 Michigan stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 29 in half of years, as early as September 15 one year in ten, and holds off past October 11 one year in ten. A hard freeze of 28°F follows 11 days later, around October 10; in spring the one-in-ten date for 28°F is May 23, 13 days before the 32°F one. The freeze-free season lasts 129 days in a typical year, shorter than at 87% of the 172 Michigan stations; it reaches 150 days one year in ten and falls short of 109 one year in ten. On average 190 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 June 3, and return around September 16. Severe cold of 16°F or below comes every winter, usually between November 18 and April 3.

July is the warmest month at Lupton 1S, MI, averaging 81°F by day and 54°F at night; January is the coldest at 27°F and 10°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 19% of years.

Warmth for growing adds up to 1,970 growing degree days a year (base 50°F), fewer than at 81% of the 172 Michigan stations. 31% of them (611) have built up by the end of June, and July adds the most, 539.

The nearest other station, Mio Wwtp, MI, 13 miles north of Rose City, has a last frost 1 day earlier (May 20), a first frost 2 days later (October 1), a season 4 days longer.

The first measurable snow (0.1 inch or more) in Rose City usually arrives around November 23, and the last of the season around April 5. Those are the middle dates across the winters of 1991–2020 at Lupton 1S, MI, 9.2 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 46 days after the last snow.

ZIP 48654 is 9 miles from Lupton 1S, MI, which stands at 908 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 48654 in zone 5a, the band where the coldest night of the year averaged -20 to -15°F (-28.9 to -26.1°C) over 1991–2020; a zone describes winter lows, not frost dates.