Frost Dates for 49727 — East Jordan, Michigan

Half of springs at E Jordan, MI see their last 32°F night by May 23; only one in ten is past it by May 5, and one in ten still has one after June 6. Planting tender crops after May 28 leaves a 30% risk of a frost on them, after May 31 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 2 in half of years, as early as September 17 one year in ten, and holds off past October 17 one year in ten. A hard freeze of 28°F follows 14 days later, around October 16; in spring the one-in-ten date for 28°F is May 23, 14 days before the 32°F one. The freeze-free season lasts 131 days in a typical year, shorter than at 84% of the 172 Michigan stations; it reaches 154 days one year in ten and falls short of 110 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 12 days longer, to about June 4, and return around September 18. Severe cold of 16°F or below comes every winter, usually between November 28 and April 3.

July is the warmest month at E Jordan, MI, averaging 83°F by day and 55°F at night; January is the coldest at 30°F and 15°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 20% of years.

Warmth for growing adds up to 2,288 growing degree days a year (base 50°F), fewer than at 56% of the 172 Michigan stations. 32% of them (731) have built up by the end of June, and July adds the most, 586. Precipitation totals 32.8 inches a year, most in October (4.4") and least in February (1.3"); May to September bring 49% of it.

The nearest other station, Boyne Falls, MI, 10 miles east of East Jordan, has the same 50% last-frost date, a first frost 1 day later (October 3), a season 2 days longer.

The first measurable snow (0.1 inch or more) in East Jordan usually arrives around November 9, and the last of the season around April 11. Those are the middle dates across the winters of 1991–2020 at E Jordan, MI, 1.1 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 42 days after the last snow.

ZIP 49727 is 1 mile from E Jordan, MI, which stands at 587 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 49727 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.