The 2021 Breeders' Cup Challenge series consisted of 84 horse races that provided the respective winners with an automatic "Win and You're In" Berth in the 2021 Breeders' Cup, held on November 5 and 6. Races were chosen by the Breeders' Cup organization and include key races in the various Breeders' Cup divisions from around the world. The Breeders' Cup organization pays the Breeders' Cup entry fee for the challenge race winners, provided they had been nominated as foals. They also provide travel allowances for out of state competitors