Early career Fenhaus was inspired to race after watching his cousin, father, and grandfather race snowmobiles on ice oval tracks. He would start racing snowmobiles and then began racing on pavement in
go-kart and
bandolero racing. At the age of fourteen, he began competing in
late model racing events at State Park Speedway in his hometown of
Wausau, Wisconsin. Growing up, he watched races at the track and was inspired by
Tim Sauter and his success in races there. After winning the 2021
Slinger Nationals, Fenhaus earned a spot in the
Superstar Racing Experience race at
Slinger Speedway. He competed in the race against many current and former
NASCAR and
IndyCar drivers and finished second (behind
Marco Andretti) and led the most laps.
CARS Tour In the
CARS Tour, Fenhaus drove the No. 96
Chevrolet for Highlands Motorsports in 2022 and won the championship in their Pro Late Model Tour.
ARCA Menards Series In January 2022, Fenhaus drove a stock car for the first time as he tested an
ARCA Menards Series car in the series' preseason test session at
Daytona International Speedway for
Fast Track Racing. He did not end up running any ARCA races for Fast Track or another team in 2022. On March 3, 2023, it was announced that Fenhaus would run the full season in the
ARCA Menards Series East for the new
Pinnacle Racing Group team in their No. 28 car. After winning two races at
Nashville Fairgrounds Speedway and
Iowa Speedway, he finished second in the championship to
William Sawalich after suffering a crash in the season finale at
Bristol Motor Speedway.
NASCAR Craftsman Truck Series in 2025 In 2024, it was revealed that Fenhaus would make his debut in the
NASCAR Craftsman Truck Series at
World Wide Technology Raceway, driving the No. 66
Ford for
ThorSport Racing, where he finished in tenth place. He then ran the races at
Pocono Raceway and
Lucas Oil Indianapolis Raceway Park, finishing twenty-second and seventh respectively. In 2025, it was announced that Fenhaus would run another partial Truck Series schedule with ThorSport in the No. 66, this time in eleven races. At
Michigan, Fenhaus would score his first career pole and would earn his best career finish of third-place. ==Personal life==