Finished fifth in the NASCAR XFINITY Series standings in his first season of full-time competition and competed through the second round of XFINITY Series Playoffs.
Competed as the youngest driver in the XFINITY Series Playoffs at 19 years and 9 months old.
Scored one win, seven top-five finishes, 19 top-10s and led 301 total laps.
Finished third in the Sunoco Rookie of the Year standings while achieving 10 rookie of the race awards.
Earned the most points at 1.5-mile tracks among XFINITY Series drivers with 422 total points.
Scored first XFINITY Series victory Nov. 18 at Homestead-Miami Speedway. Earned a perfect driver rating of 150.0 after winning Stage 1 & 2 and the race victory. He was the only driver to earn such a feat in the 2017 NASCAR XFINITY series season.
Competed in one ARCA Series race at Road America on August 27.
Made full-time XFINITY Series debut with Stewart-Haas Racing on February 25.
Finished 10th in NASCAR Camping World Truck Series point standings in his first season of full-time competition. Scored five top-five and 14 top-10 finishes.
Captured two Truck Series poles: Sept. 3 at Canadian Tire Motorsport Park in Bowmanville, Ontario, Canada and Oct. 22 at Talladega (Ala.) Superspeedway.
Twice earned a season-best finish of second place – at Iowa Speedway in Newton on June 18 and Canadian Tire Motorsport Park on Sept. 4.
Started five NASCAR XFINITY Series races with his best finish being a fourth-place effort at Charlotte (N.C.) Motor Speedway on May 28.
Made XFINITY Series debut on April 23 at Richmond (Va.) International Raceway, where he finished sixth after starting 17th.
Became the youngest pole winner in ARCA Racing Series history at Daytona (Fla.) International Speedway on Feb. 12.
Competed in 10 Truck Series races. Scored one win, two top-five and four top-10 finishes.
Captured Truck Series pole Oct. 31 at Martinsville (Va.) Speedway.
Became the youngest superspeedway winner in ARCA Racing Series history at Pocono (Pa.) International Raceway on Aug. 1. The win came in Custer’s third ARCA Series start.
Won Truck Series race at Gateway Motorsports Park in Madison, Illinois on June 13. It was Custer’s second Truck Series win.
Made ARCA Series debut May 24 at New Jersey Motorsports Park in Millville, New Jersey, where he finished fifth after starting from the pole.
Competed in nine Truck Series races. Scored one win, two top-five finishes and six top-10s.
Scored first career Truck Series victory Sept. 20 at New Hampshire Motor Speedway in Loudon from the pole. At 16 years, 7 months and 28 days, Custer became the youngest race winner in NASCAR national series history.
Became the youngest pole winner in national touring series history at 16 years, 4 months and 22 days at Gateway on June 14. The pole came in Custer’s third Truck Series start.
Made Truck Series debut March 30 at Martinsville, where he finished 12th.
Competed in a combined 10 NASCAR K&N Pro Series East and West races and scored two wins, four top-fives and four top-10s.
Won two Pro Series races: Feb. 27 at Phoenix International Raceway and April 26 at Richmond.
Finished eighth in Pro Series East point standings in his first season of full-time competition. Scored two wins, five top-five and six top-10 finishes.
Won Pro Series East race at New Hampshire on Sept. 21 from the pole. It was Custer’s second Pro Series East win.
Scored first career Pro Series East victory Aug. 2 at Iowa Speedway in Newton from the pole. At 15 years, 6 months and 10 days, became the youngest winner in Pro Series history. In addition to breaking Dylan Kwasniewski’s youngest race-winner’s age record by nearly six months, Custer also became the first driver to lead every lap in the combination race.
Captured two Pro Series East poles: Aug. 2 at Iowa and Sept. 21 at New Hampshire.
Competed in two Pro Series West races.
Captured one Pro Series West pole Nov. 8 at Phoenix.
Competed in Late Model Stock Cars, winning 10 races, including his first start at I-10 Speedway in Blythe, California.
Won 15 races in 22 starts on his way to winning the 2011 United States Auto Club (USAC) National Focus Young Guns Championship.
Competed in USAC Midgets and Legend Cars.
Competed in Quarter Midgets and Legend Cars.
Earned Quarter Midget championships in Sr. Honda and Sr. Stock divisions.
Competed in Quarter Midgets at Pomona Valley, California and Orange Show, California.
Competed in Quarter Midgets at Pomona Valley and Orange Show.
Competed in Quarter Midgets at Pomona Valley.
Competed in select North Carolina Quarter Midget Association races, in the Jr. Honda and Jr. Stock series.
Competed in Quarter Midgets at Pomona Valley, in the Jr. Novice and Jr. Honda series.
Won six races and the Jr. Novice Series championship.