Regicides Trail is a Blue-Blazed hiking trail, about 7 miles (11 km) long, roughly following the edge of a basalt, or traprock, cliff northwest of New Haven, Connecticut. It is named for two regicides, Edward Whalley and his son-in-law William Goffe, who signed the death warrant of King Charles I of England. Upon the restoration of Charles II to the throne and the persecution of the regicides, the pair hid in Judges Cave near the south end of the trail in 1660.
The trail is a narrow footpath marked with blue blazes, sometimes rocky with difficult footing. It is roughly paralleled by Baldwin Drive, a paved road currently closed to motor vehicles, except for maintenance vehicles, named for New Haven native Simeon E. Baldwin, governor of Connecticut from 1911 to 1915. The trail is within the towns of New Haven, Hamden, Woodbridge, and Bethany, and entirely within West Rock Ridge State Park, but is maintained by a private organization, the Connecticut Forest and Park Association, in conjunction with the West Rock Ridge Park Association.
At its southern end, the Regicides Trail terminates behind a pavilion at the park's South Overlook, which has a panoramic view of South Central, Conn., including Sleeping Giant State Park, East Rock Park, New Haven Harbor, and the Long Island Sound. At its northern end, the Regicides Trail connects with the Quinnipiac Trail. Both trails are part of the state's system of "Blue-Blazed Trails" totaling more than 800 miles (1,300 km).