Career
Gröndahl retired from competitions after failing to qualify for the 1956 Olympics. Between 1953 and 1980 he worked as the harbormaster of the port of Pori. In 1982 he was awarded the Golden by the Finnish Ministry of Education.
A park in the Reposaari district of Pori is named after him.
Gröndahl was married and had four children, born in 1946, 1947, 1949 and 1956.