Northern Indiana – A frost advisory is in effect across parts of northern Indiana, southwest Michigan, and northwest Ohio overnight May 11–12, with temperatures expected to settle into the 30s.
According to the National Weather Service in Northern Indiana, the advisory begins late Monday night at midnight EDT (11 p.m. CDT) and continues through 8 a.m. EDT Tuesday. Areas impacted include cities such as South Bend, Elkhart, Fort Wayne, La Porte, Coldwater, Benton Harbor, and Defiance.
The advisory spans a wide portion of the region, including northern Indiana counties like Allen, Elkhart, and Kosciusko, parts of southwest Michigan including Berrien and Branch counties, and northwest Ohio counties such as Williams, Fulton, and Defiance.
Frost formation is expected to be most widespread in northern areas, while more patchy frost is possible farther south, particularly along and south of U.S. 30 in Indiana and parts of northwest Ohio.
The main concern is damage to sensitive outdoor vegetation. Plants left uncovered overnight may be harmed or killed as temperatures approach freezing for several hours.
Residents are urged to take precautions by covering plants or bringing them indoors before midnight. Gardeners and farmers should act quickly to protect early-season growth.
Temperatures are expected to rise after sunrise Tuesday, ending the frost threat by mid-morning.
