As of October 19, 2025, there are 19 Formula 1 races that have taken place since the start of the 2025 season. The 2025 F1 calendar consists of a total of 24 Grand Prix events. Therefore, the number of F1 races left in the 2025 season after October 19 is 5. The remaining races after the United States Grand Prix (which is on October 19) are:

1. Mexico City Grand Prix on October 26, 2025
2. São Paulo Grand Prix on November 9, 2025
3. Las Vegas Grand Prix on November 22, 2025
4. Qatar Grand Prix on November 30, 2025
5. Abu Dhabi Grand Prix on December 7, 2025

This means there are exactly five races left to complete the 2025 F1 season.