2021

On April 1, 2021, Pabst Racing announced that it had signed Denmark to drive in the U.S. F2000 National Championship. He got his first podium at Lucas Oil Indianapolis Raceway Park. Denmark finished 11th in the championship.

2022

Denmark would return to the USF2000 series for the 2022 season again driving for Pabst Racing. He got his maiden win at the first race of the season at St. Petersberg after a crash with Myles Rowe and Thomas Nepveu promoted Denmark to the lead.^[3] In the second race, Denmark reached the podium again, finishing P2.

Denmark continued to have multiple wins throughout the season at Road America and Toronto, before heading into the three-race season finale in Portland.

Season finale

At the beginning of the Portland race weekend, Denmark was sitting third in the championship with 321 points, just behind Michael d'Orlando (323 points) and Myles Rowe (346 points). After a successful qualifying, Denmark was in P1 for all three races and won Race 1 despite some contact in the opening lap. This put Denmark to within 4 points of championship leader Myles Rowe (Rowe: 357, Denmark: 353 , d’Orlando: 337).^[4]

In Race 2, Denmark started in pole position, however his teammate and championship leader Rowe drove over the back of Denmark's car at turn one, causing Denmark to retire. Rowe subsequently finished 16th, with fellow championship contender d'Orlando finishing P4.

Denmark (357 points) was once again on pole for Race 3 and was just 6 points behind championship leader Rowe (363 points), with d'Orlando just one point behind (356 points). Denmark led the way heading into turn one, but another driver, this time Thomas Nepveu made contact with Denmark's rear spinning Denmark around. This knocked Denmark out of the points. Rowe also experience contact in the opening lap, and despite making up 10 places, finished the race in 5th. d'Orlando won the race, and thus won the championship,

Alongside the third place championship trophy, Denmark also received the championship's Spirit Award for the USF2000 2022 season.

U.S. F2000 National Championship

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap) (Races with * indicate most race laps led)

USF Pro 2000 Championship

(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap) (Races with * indicate most race laps led)