Deegan placed 4th in his debut 250cc SX race at round 4, Houston.
[4] He finished second in the final point standings, thus earning him the 2023 250SX Rookie of the Year award.
Deegan overachieved in his first full national season with six podium finishes along with two wins, which led him to a 4th place finish in the championship, thus earning him the 2023 250MX Rookie of the Year award.
Deegan won the first moto in the inaugural SuperMotocross championship at round one in Charlotte Motor Speedway.
Deegan captured the inaugural 250cc SuperMotocross championship at round three in LA Coliseum with a 5-2 score for 1st.