After a brief second stint in high school teaching, Siemering then became the inaugural head coach of Cabrillo College, a two-year community college in Aptos, California. He coached there from 1959 to 1965.
Following a brief period as a high school teacher, Siemering took on the role of the inaugural head coach at Cabrillo College in Aptos, California. He served in this position from 1959 to 1965.