Frost Dates for 49779 — Rogers City, Michigan

Half of springs at Rogers City, MI see their last 32°F night by May 10; only one in ten is past it by April 28, and one in ten still has one after May 24. Planting tender crops after May 16 leaves a 30% risk of a frost on them, after May 21 20%, and after May 24 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 14 in half of years, as early as September 30 one year in ten, and holds off past October 31 one year in ten. A hard freeze of 28°F follows 14 days later, around October 28; in spring the one-in-ten date for 28°F is May 15, 9 days before the 32°F one. The freeze-free season lasts 154 days in a typical year, shorter than at 60% of the 172 Michigan stations; it reaches 176 days one year in ten and falls short of 135 one year in ten. On average 162 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 14 days longer, to about May 24, and return around October 1. Severe cold of 16°F or below comes every winter, usually between December 2 and March 31.

July is the warmest month at Rogers City, MI, averaging 80°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 November 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 2,120 growing degree days a year (base 50°F), fewer than at 71% of the 172 Michigan stations. 27% of them (574) have built up by the end of June, and July adds the most, 583. Precipitation totals 31.8 inches a year, most in June (3.4") and least in February (1.5"); May to September bring 50% of it.

The nearest other station, Onaway 4N, MI, 19 miles west of Rogers City, has a last frost 12 days later (May 22), a first frost 12 days earlier (October 2), a season 19 days shorter.

The first measurable snow (0.1 inch or more) in Rogers City usually arrives around November 6, and the last of the season around April 13. Those are the middle dates across the winters of 1991–2020 at Rogers City, MI, 1 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 27 days after the last snow.

ZIP 49779 is 1 mile from Rogers City, MI, which stands at 615 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 49779 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.