![]() For example, the Saginaw Valley region has typically had its first freeze events of the year later (Oct. Michigan has a large range of first-frost zones, dictated by the macroclimate of the Great Lakes region and the microclimates of local topography and land-use. ![]() This “First Frost” map shows ranges when frost first occurs, on average, in Michigan, but you can also check for the up-to-date overnight hours below freezing at Michigan State University's Enviroweather. Climate and topographical conditionsįrost and freezing conditions can be combated in early fall by keeping up to date on weather forecasts and taking appropriate action. However, when freeze damage occurs, it is irreversible. However, some plants have more room to spare in their tissues and can withstand a certain amount and duration of internal ice formation without serious injury. When this occurs, water expands and can burst cell walls like cracks in Michigan roads in January. ![]() A frost becomes a freeze event when ice forms within and between the cell walls of plant tissue. With a frost, the water within plant tissue may or may not actually freeze, depending on other conditions. Frost versus freezingĪ frost occurs when air temperatures dip to 32 degrees Fahrenheit or lower at ground level. Preventative actions can be taken, but once severe freeze injury occurs, it is irreversible. Vegetable crops planted for fall harvest can be susceptible to early overnight cold snaps, and delayed summer plantings may not fully mature before cold temperatures put the brakes on growth.
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