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Old 08-17-2011, 05:44 AM
351 posts, read 843,559 times
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It is quite interesting to see the difference in the date of first frost in Michigan. This determines the growing season and which plants can survive in the area.

Here is a first frost map:

The link below may be a more accurate first frost map:

Michigan Interactive First Frost Map

There are "warm" spots near St. Joe and South Haven, and in the Detroit-Port Huron area.

There are cold spots near Gaylord and west of Marquette. There is a huge difference in the length of the growing season.

This is amazing that there is such a big difference in the growing season, with St. Joe and Detroit having more than 180 days, and west of Marquette having less than 60!

Growing Season

Here is a table of first frost dates:

Frost Dates for Michigan - Victory Seed Company

It looks like Watersmeet wins the first frost award, with a 10% chance of first frost on August 12!
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Old 08-17-2011, 07:16 AM
Location: somewhere between Lk. Michigan & Lk. Huron
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Looking over the map of the growing season, where I'm located on the map, I would be just inside the bottom "pink" part of the state, & the length of growing season sounds about right, since pumpkins & squash can be picked in the Fall.

We are not far away from having frost, this early A.M. it was 41* & that was around 8:00 a.m.
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Old 08-17-2011, 07:44 AM
Location: Wyandotte, MI
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Detroit has 150 days between first (Oct 9) and last (May 12) frost, so Im unsure of why the dot of 180+ days, although there is a difference between a freeze (32 or lower) and frost (which can be mid-upper 30s), and we do see that often times in the Fall. The suburbs will have numerous freezes before Detroits first.
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Old 08-17-2011, 11:04 PM
Location: In them thar hills
12,824 posts, read 17,850,845 times
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Elevation and distance from the water.

Interestingly, our maps here in CA work the same. You can go from a frost free area to an Aug / Sept frost area over an incredibly short distance.
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