The 2021 Formula 4 United States Championship season was the sixth season of the Formula 4 United States Championship, a motor racing series regulated according to FIA Formula 4 regulations and sanctioned by SCCA Pro Racing, the professional racing division of the Sports Car Club of America.
The series held a pre-season test at Virginia International Raceway as well as a Winter Cup at Homestead–Miami Speedway in February and March.
Each round is set to feature three races.
[26] Later on, the opening rounds at Sonoma Raceway and Laguna Seca were replaced by competitions at Road Atlanta and Road America.
[27] The final round was moved forward by two weeks and supported United States Grand Prix.