Joan and Ron Wimmer first discovered their son's love for speed when Scott began skiing competitively at age five. He then started racing three-wheelers when he was eight. The young Wimmer finished second in the National Amateur Off-Road Championship one year later, and he didn't slow down from there.
By age 14, Wimmer competed in the Junior Olympics in downhill skiing and the slalom. He finished 13th out of 150 competitors in the national competition. In 1991, 15-year-old Wimmer traded the three-wheelers and skis in for four wheels and made his stock car racing debut at Wausau (Wis.) Speedway.
In 1994, Wimmer was named Rookie of the Year at State Park Speedway, Dells Motor Speedway and WI Short Track Series in Wisconsin. Over the next couple of years, Wimmer became a dominant force in racing series throughout the Midwest claiming several local and regional championships.
In 1997, he was Rookie of the Year in the Hooter's Cup Late Model Series. Wimmer really began to draw the attention of NASCAR team owners when he finished second in Rookie of the Year points in the ASA series and won consecutive races at Lanier National Speedway and Hickory Motor Speedway.
He began racing in the Busch Series in 2001 and got his first four Busch Series wins in 2002. In late 2003, Wimmer got his first full-time job in NASCAR's elite series, when he was tabbed to replace Ward Burton in the No. 22 Dodge for Bill Davis Racing.