Bobcock was elected suffragan bishop of Massachusetts in 1913, and was consecrated on June 17, 1913, by the Bishop of Massachusetts William Lawrence. He retained the post till his retirement in 1938. He was the first Suffragan Bishop of Massachusetts and one of the first in the Episcopal Church. He died on June 20, 1942. His funeral was held in St Paul's Cathedra, Boston, where Bishop Henry Knox Sherrill was celebrant.
