Michigan State University Extension reports frost free dates are based on historical information. The frost free date is going to be when there is no danger of frost. The problem is these are based on what has happened, not what is going to happen. Gardeners often think these dates are predictions of what is going to happen, but as this spring has proven you can't always depend on past history.
|Check your area’s frost free date to determine when to start|
planting your garden.