Grand Rapids first muddy 5K, this run has something for everyone. Run as an individual or a four person team (costumes encouraged). All adult 5k runners are timed. Our Kids Mini Mud will challenge your 6 - 12 year olds. This event attracts mud lovers from all over and includes multiple mud pits, a 60 foot slide, tunnel crawls, walls, slippery hill climbs and more. The Grand Rapids Mud Run is Tough Fun.