[2] After winning his first two titles aboard a Suzuki in the 85cc categories in 2010, he was signed by the Team Green amateur Kawasaki squad.

Following this, he signed a multi-year contract with the Monster Energy Pro Circuit Kawasaki team for his professional debut in 2016.

[6] His season started strongly in the 250 class of the 2017 AMA National Motocross Championship following this, scoring several top-three race finishes and a podium at the fifth round.

Forkner finished seventh in the 250 standings of the 2018 AMA National Motocross Championship with a single race win and overall podium being the highlights of the campaign.

However, a crash ended his hopes and saw him pick up multiple abdominal injuries, causing him to again miss the entire AMA Motocross Championship.

[10] Forkner managed to recover in time to compete a full season of the 250 class in the 2021 AMA National Motocross Championship, finishing seventh in the final standings, with two fifth overalls being the highlights of his campaign.

[13] Forkner's 2023 AMA Supercross Championship ended at the first round of the 250SX West class, tangling with two other riders and sustaining several knee injuries as well as a broken bone in his hand from the ensuing crash.

At the second round, Forkner was fastest on track and had a clear lead in the final when he had a brutal crash that saw him sustain an injury to his spine and scapula.