Boston Celtics start 2025-2026 season Oct 22 vs 76ers, without star Jayson Tatum due to injury.

The Boston Celtics' 2025-2026 season kicks off on October 22 at home against the Philadelphia 76ers, with 25 nationally televised games planned but no Christmas Day appearance. Key games include rematches like the one against the New York Knicks on October 24, and a series featuring player reunions and trades. Notably, star Jayson Tatum is sidelined due to a ruptured Achilles tendon, expected to recover in four to six months.