The final event of the 4Gmx Indoor Winter Motocross series will be held Saturday at the James Kjerstad Event Center on the Central States Fairgrounds.
Motocross enthusiasts gather every month to watch and race during the winter season.
"We love doing it," said Robert Grable, promoter and owner of the event. "We love giving these young people something to do in the wintertime because there's no other place to ride up where we live in the winter."
Grable estimated that 300 to 325 racers participated each month, with audiences hovering around 1,200.
"This has been a phenomenal year," Grable said. "We're in an upswing, with the last five years at a pretty good high."
Participants compete in 23 different classes from ages as young as 4 and as old as 60, according to Grable. There are three pro classes: 250A, 450A and Open, which allows either 250A or 450A classes.
"The difference is in the bike size," Grable said. "The bigger the bike, the faster it goes. It's about ability."
Grable said that audience members and racers keep returning for the adrenaline rush that comes with the races.
"These people can jump stuff, maneuver a 300-pound machine through the air at high speeds while in total control," Grable said. "It's hard to describe to someone who hasn't been there, but it's like snowboarding or skiing: once you've done it, you know if it's your thing, and you're hooked. It's just a good show."