What Is The True Frost Free Date For Northern Kentucky?

The zone is 5b and 6a. The saying is don’t plant your vegetables until Mother’s Day. If you do a search online for “frost free dates’ most will give the USDA hardiness zone frost free dates. For zones 5b-6a the frost free date is April 15. Why is the saying for Mother’s Day? Why is April 15 the USDA hardiness zone’s frost free date?

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