As a member of the Akademischer Gesangverein [de], he took private singing lessons with the Hofkapellmeister Felix Otto Dessoff.
With the help and support of his two teachers he was able to make his very successful debut as "Ashton" at the city theatre of Brno on 10 March 1868.
In June 1871, Krückl met his colleagues Ludwig Barnay and Ernst Gettke [de] in Weimar to found the Guild of the German Stage.
In the summer of 1892, he became artistic director at the Strasbourg city theatre where he could celebrate his 25th anniversary on 12 May of the following year.
Shortly after his 58th birthday, Krückl died on 12 January 1899 in Strasbourg, where he also found his final resting place.