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First frost dates are based on historical averages, but of course, weather is unpredictable. It's estimated that a frost may occur earlier than the given date 30% of the time.
The average last frost date in spring is May 1, and the average first frost in fall is October 11, giving the area a growing season of 162 days. [40] The city is in plant hardiness zone 6a, while outlying areas are 5b. Some far western suburbs closer to the insulating effect of Lake Michigan are in zone 6b. [41]
The first frost is looming on Cape Cod's calendar, so we try to pin down the date with info from the Farmers' Almanac and other experts.
Here's when Milwaukee has historically recorded its first frost, according to NWS: Average first frost: Oct. 22. Earliest first frost recorded: Sept. 20, 1966. Latest first frost recorded: Nov. 24 ...
The maximum frost depth observed in the contiguous United States ranges from 0 to 8 feet (2.4 m). [1] Below that depth, the temperature varies, but is always above 0 °C (32 °F). Alternatively, in Arctic and Antarctic locations the freezing depth is so deep that it becomes year-round permafrost , and the term " thaw depth " is used instead.
For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [37]
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Map showing the snowbelts around the Great Lakes of North America with 150 cm (60 in) accumulations or more during winter. The Snowbelt, Snow Belt, Frostbelt, or Frost Belt [1] is the region near the Great Lakes in North America where heavy snowfall in the form of lake-effect snow is particularly common. [2]