* WHAT...Temperatures as low as the lower to middle 30s will result in frost formation. * WHERE...Price, Ashland, Bayfield, Douglas, Iron, Sawyer, and Washburn Counties. * WHEN...From midnight tonight to 8 AM CDT Monday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Areas inland from Lake Superior have the greatest risk of frost formation tonight. That includes southern portions of Douglas and Bayfield counties. Areas around Superior are less likely to experience frost. Some of the typical colder spots in inland northwest Wisconsin may drop to around or slightly below freezing for a couple hours around sunrise Monday morning.