Haiden Deegan

Haiden Deegan is the son of professional freestyle motocross rider and racing driver Brian Deegan. He is the younger brother of NASCAR driver Hailie Deegan and the older brother of Hudson Deegan, who races in the Supermini class. His mother is named Marissa.

In 2025, Deegan was arrested in Walton County, Florida, on charges related to street racing and stunt driving.

Deegan began competing at the age of six in 2011. He competed in national-level amateur motocross events in the United States and won seven titles at the AMA Amateur National Motocross Championship at Loretta Lynn's Ranch across several youth classes.

He spent most of his amateur career racing KTM motorcycles. At 10 years old, he performed a dirt bike backflip on a 65cc motorcycle, an achievement described as making him the first 10-year-old to complete the maneuver. He signed with Monster Energy Star Yamaha Racing in 2021.

Deegan made his professional debut in the 250SX class of the 2023 AMA Supercross Championship. He finished fourth at round four in Houston, earned three podium finishes during the season, placed second in the final standings and received the 2023 250SX Rookie of the Year award.

In the 2023 AMA Pro Motocross Championship, he won overall at the RedBud National and Washougal. He finished fourth in the final 250 class standings with 371 points.

During the 2024 Supercross season, Deegan won his first 250SX race at Arlington, Texas, and added victories at rounds 13 and 17. He finished second in the 250SX East standings behind Tom Vialle. In the 2024 AMA Pro Motocross Championship, he won the 250 class title after recording five overall victories.

Deegan was selected to represent Team USA at the 2024 Motocross of Nations with Chase Sexton and Aaron Plessinger, but withdrew his participation to focus on recovering from a wrist injury.

Deegan won the inaugural 250cc SuperMotocross World Championship in 2023 and successfully defended the title in 2024. The SuperMotocross World Championship combines supercross and motocross competition.

In 2025, he moved from the 250SX East Region to the 250SX West Region. He clinched the Western Regional championship at the 16th round in Denver, Colorado.