Judge Frank Kroon was born on 14 August 1941, in Graaff-Reinet. He matriculated at Union High school in 1958. in 1962 he obtained his B.Com degree, and, in 1963, his LL.B degree from the University of Cape Town.

He was admitted as an advocate in 1964 and served as a member of the Attorney-General’s staff in Grahamstown from 1964 to 1965. he was a member of the Eastern Cape Bar from 1965 to 1983, and a member of the Bar Council of the Eastern Cape from 1981 to 1983. Judge Kroon took silk on 11 November 1981.

He served as an Acting Judge of the Natal Provincial Division and Eastern Cape Division from 1983 to 1985. Since 1985 he has served as a Judge of the Eastern Cape Division. He was also a part time Judge of the Labour Appeal Court from 1997 to 1999. Judge Kroon was Chairman of the Board of the National English Literary Museum in Grahamtown from 1987 to 2003. he was also Chairman and sole member of the Commission of Inquiry into the Tsolo Violence in 1995.

Judge Kroon is married to Jennifer Ann. He has three children.