He and his family came on the ship Arkwright in 1866. They likely traveled in the Daniel Thompson Company. Their son James, who had traveled to Utah a few years before, was working in this company as a teamster. However, further research is needed to verify this.
William's son, George Garrett, born 21 January 1850, appears with the family on the 1866 Arkwright ship manifest, but further research is needed to determine if he arrived in Utah by 1868.