We are starting to see more and more crisp mornings across the region but that does not mean that the growing season is over. Technically speaking, the growing season is defined as the period of time from the last frost before summer and the first frost of the fall season, which in Minnesota can be before Fall officially starts.
In the Twin Cities we usually see our last frost by mid-May and we are still waiting for the official first frost of the fall season. Since we are so far north, we can see quick changes in the temperatures across the region, resulting in various dates for the first frost of the season. Even Lake Superior will give the north shore area a later date for the first frost, with the relatively warm water keeping temperatures near the lake above the frost threshold.
Even once the first frost takes hold; it's not necessarily the end of the world for you plants and veggies. The magic number for completely ending the growing season is about 24°. After that, it's usually lights out for the growing season.
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