The first Episcopal services were held in Helena on August 11, 1867 by Bishop Daniel Sylvester Tuttle and the Rev.

He paid $1,200 for property on Warren and Grand Streets to build a church, known as St. Peter's.

Sidney Douglass Hooker, originally from Watertown, New York, who was rector through the initial planning of the new cathedral.

Spokane, Washington architect Harold Whitehouse designed it in the English country Gothic style.

[5] The new St. Peter's Church was completed for $90,000 and dedicated by Bishop Faber on Easter Sunday, March 27, 1932.

Father Ray Brown celebrates Eucharist with drums, with offerings of sweet grass and sage, on the 2nd and 4th Saturdays of each month except July and August, due to powwow season.