Frost Dates for 48626 — Hemlock, Michigan

Half of springs at Saginaw Mbs International Airport, MI see their last 32°F night by April 26; only one in ten is past it by April 13, and one in ten still has one after May 13. Planting tender crops after May 3 leaves a 30% risk of a frost on them, after May 7 20%, and after May 13 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 62% of the 172 Michigan stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 17 in half of years, as early as October 2 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 31; in spring the one-in-ten date for 28°F is April 30, 13 days before the 32°F one. The freeze-free season lasts 172 days in a typical year, longer than at 80% of the 172 Michigan stations; it reaches 193 days one year in ten and falls short of 151 one year in ten. On average 139 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 11 days longer, to about May 7, and return around October 5. Severe cold of 16°F or below comes every winter, usually between December 3 and March 17.

July is the warmest month at Saginaw Mbs International Airport, MI, averaging 82°F by day and 61°F at night; January is the coldest at 30°F and 16°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 36% of years.

Warmth for growing adds up to 2,693 growing degree days a year (base 50°F), more than at 72% of the 172 Michigan stations. 33% of them (892) have built up by the end of June, and July adds the most, 673. Precipitation totals 32.2 inches a year, most in August (3.9") and least in February (1.8"); May to September bring 50% of it.

The nearest other station, Midland, MI, 13 miles north of Hemlock, has a last frost 3 days later (April 29), a first frost 1 day earlier (October 16), a season 5 days shorter.

The first measurable snow (0.1 inch or more) in Hemlock usually arrives around November 21, and the last of the season around April 11. Those are the middle dates across the winters of 1991–2020 at Saginaw Mbs International Airport, MI, 10.8 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 15 days after the last snow.

ZIP 48626 is 11 miles from Saginaw Mbs International Airport, MI, which stands at 660 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 48623 (Freeland). The 2023 USDA Plant Hardiness Zone Map lists ZIP 48626 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.