Tar spot of corn, caused by Phyllachora maydis, is a newly established and emerging disease in the United States. Since 2018, it has had significant yield impacts on corn production in northern Indiana and regions around Lake Michigan, causing an estimated 20 to 60 bu/acre yield loss. Tar spot has also continued to spread as it has now been confirmed in 14 states and Canada. The tar spot fungus can overwinter in the upper Midwest resulting in high inoculum levels that are able to cause disease in future seasons when favorable environmental conditions occur. In 2021, significant losses expanded beyond northern Indiana to pockets in the southern part of the state. A summary of our experiences in Indiana on the distribution and spread of tar spot will be presented, as we continue to improve our understanding of this disease.