The 2021 NASCAR Xfinity Series was the 40th season of the NASCAR Xfinity Series, a stock car racing series sanctioned by NASCAR in the United States. The season began at Daytona International Speedway with the Beef. It's What's for Dinner. 300 on February 13. The regular season ended with the Food City 300 at Bristol Motor Speedway on September 17. The NASCAR playoffs ended with the NASCAR Xfinity Series Championship Race at Phoenix Raceway on November 6.