The Macomb County event, which benefited the Huron-Clinton Metroparks, began at 5 p.m. Sunday when the human runners were released and about two dozen zombies followed 1 minute later, the Detroit Free Press reported Monday.
The organizers said the participants, young and old, who raced through a cornfield maze and nearby woods, paid fees based on whether they ran as humans or zombies.
Fake body parts and blood were seen on some of the zombie entrants.
Wolcott Mill Metropark farm interpreter Kathleen Clinton said the event was unique.
"There wasn't anything really like this in the area," she said.