What Is the O’Reilly Auto Parts Series?
The NASCAR O’Reilly Auto Parts Series is NASCAR’s second-tier national touring series. It carried the Xfinity Series name through 2025 and adopted the O’Reilly Auto Parts title in 2026.
The series combines full-time championship teams, developing drivers, veteran series regulars and event-specific entries. A driver can compete for more than one organization during a season.
2026 Championship Structure
The 2026 season contains 33 races:
- Races 1–24: regular season
- Race 24: Daytona International Speedway on August 28
- Races 25–33: the nine-race Chase
- Chase field: 12 drivers
- Championship finale: Homestead-Miami Speedway on November 7
Chase Tracks
The Chase visits Darlington Raceway, World Wide Technology Raceway, Bristol Motor Speedway, Las Vegas Motor Speedway, Charlotte Motor Speedway, Phoenix Raceway, Talladega Superspeedway, Martinsville Speedway and Homestead-Miami Speedway.
Charlotte Motor Speedway’s current event information places the 2026 O’Reilly race on the 1.5-mile oval.