Bruce Hornsby's tenure with the Grateful Dead spanned approximately five years, during which he transitioned from a frequent guest to a de facto band member. Key Eras of Hornsby with the Dead

• De Facto Member (1990–1992): Following the death of keyboardist Brent Mydland, Hornsby joined as a touring member from September 15, 1990, at Madison Square Garden through March 24, 1992. During this period, he played over 100 shows, often performing alongside keyboardist Vince Welnick.
• Frequent Guest (1988–1995): Hornsby first appeared on stage with the band on June 25, 1988. Even after he stopped touring full-time in 1992 to focus on his solo career, he continued to sit in frequently—often on accordion—until the band's final tour in 1995.
• Final Performance: His last show with the Grateful Dead took place on June 25, 1995, at RFK Stadium, just months before Jerry Garcia’s passing.
• Reunions: He later rejoined surviving members for the Fare Thee Well 50th-anniversary shows in 2015.