Enfinger was born and raised in Fairhope, Alabama, on the Gulf of Mexico coast. He attended the University of South Alabama, graduating in 2007 with a bachelor's degree in marketing. Before turning to national competition, he competed on short tracks in the southeastern United States, including a standout appearance at the 2007 Snowball Derby where he recorded the fastest lap.
Enfinger entered the then-ARCA Re/Max Series in 2008, competing in four races that season and running on a limited basis for the next two years. He drove primarily for a family-owned team that merged with RAB Racing in 2010. Moving to Allgaier Motorsports for 2011, he competed in his first full ARCA season and finished fourth in series standings.
By 2013, racing for Team BCR, Enfinger collected his first ARCA win at Mobile Speedway and followed it with another at Iowa. The 2014 season began in record fashion as he won the opening three races at Daytona, Mobile, and Salem, adding a fourth win at Elko. After switching to GMS Racing mid-season, he won at Berlin Raceway and DuQuoin, claiming the Bill France Four Crown Award, but finished second in points despite six victories.
In 2015, Enfinger won the season opener at Daytona again, added five more victories during the year, and secured the ARCA series championship with GMS Racing.
Enfinger made his first Truck Series start in 2010 and competed sporadically before returning full-time in 2016 with GMS Racing. Running the No. 33 Chevrolet, he won his first career Truck Series race at Talladega that fall. He joined ThorSport Racing in 2017, driving the No. 98 Toyota, and scored his second Truck win at Las Vegas in 2018.
In 2019, Enfinger clinched the NASCAR Gander Outdoors Truck Series regular season championship after winning at Michigan, but was eliminated from the playoffs at Las Vegas following an engine failure. Despite winning no races, he finished seventh in final points, with teammate Matt Crafton claiming the overall championship that year.
The 2020 season was his most productive, as Enfinger broke a 28-race winless streak by winning the season opener at Daytona over Jordan Anderson by 0.010 seconds in overtime — that victory was also Ford's 100th win in the series. He added wins at Atlanta, Richmond, and Martinsville, with the Martinsville victory qualifying him for the Championship Round. He finished fourth in points.
Due to a sponsorship shortfall, Enfinger shared the No. 98 with Christian Eckes in 2021 and ran part-time for CR7 Motorsports as well, competing in 21 of 22 races total across both teams.
He returned to GMS Racing full-time in 2022, winning at Indianapolis Raceway Park during the playoffs. In 2023, driving the No. 23, he won at Kansas, Gateway, and Milwaukee, made the Championship 4, and finished second in the final points standings — the highest finish of his career.
Enfinger joined CR7 Motorsports full-time in 2024, driving the No. 9. Though he did not win during the regular season, he gave CR7 its first-ever Truck Series win at Talladega and made the Championship 4 again, adding another victory at Homestead.
Enfinger made his Cup Series debut at Sonoma in June 2023, filling in for Noah Gragson at Legacy Motor Club's No. 42 car. He made his first Xfinity Series start in May 2021 at Charlotte for Sam Hunt Racing, qualifying for the race despite being unfamiliar with Xfinity machinery.
Enfinger married Michelle Dupre on January 16, 2016, in Fairhope, Alabama. They have a son, Carson, born in June 2021.