2023 NASCAR Xfinity SeriesPrevious2022Next2024Champions | Seasons The 2023 NASCAR Xfinity Series will be the 42nd season of the NASCAR Xfinity Series, a stock car racing series sanctioned by NASCAR in the United States. The season will start with the Beef. It's What's for Dinner. 300 on February 18 at Daytona International Speedway and will end with the NASCAR Xfinity Series Championship Race on November 4 at Phoenix Raceway.