Besides skiing, Fritz Steuri was also a renowned mountain guide. In 1905 he earned his leader patent, having previously climbed numerous summits, including the Jungfrau, the Eiger, the Finsteraarhorn and the Wetterhorn. Steuri worked for 45 years as a mountain guide, mainly around Grindelwald and in the Valais and Grison Alps. On 10 September 1921 he took part in the first ascent of the Mittellegigrat (the northeast ridge of the Eiger) with the Japanese climber Yuko Maki and fellow guides Fritz Amatter and Samuel Brawand. The descent of the ridge had been made for the first time in 1885. Shortly beforehand, Steuri had climbed the Dufourspitze, the Matterhorn and the Aletschhorn with Maki and Brawand. Subsequently Steuri led many Japanese on Alpine summits, including Prince Chichibu, with whom Steuri and other guides climbed the Wetterhorn, the Finsteraarhorn, the Schreckhorn, the Matterhorn, the summit of Monte Rosa and other mountains in September 1926. On 26 May 1926 Steuri, Prince Chichibu, Walter Amstutz, Arnold Lunn and two others first climbed the Grindelwalder Grünhorn on skis. Among other famous clients Steuri counted the writer Konrad Falke, whom he guided in September 1907 in the Jungfrau region. This resulted in Falke's 1909 published book Im Banne der Jungfrau (Under the Spell of the Virgin).