Fellow headliner Chris Stapleton was already announced at this year's festival
“Country Thunder Wisconsin has established itself as a must-see event every summer in beautiful Twin Lakes,” said Country Thunder Music Festivals CEO Troy Vollhoffer in a statement. “Ticket sales have been brisk since we announced Chris Stapleton at [this] year’s event," he continued. "By adding Tim McGraw, Jake Owen and one more very special headline guest, who will be unveiled in January, we feel like 2019 is going to be a blockbuster year.”
Vollhoffer said earlier in the year that Stapleton is the most-requested act to play the festival.