He began his coaching career at Trinity International University after his playing career had finished. He has coached eight seasons at three different high schools in California and Oregon, where his jobs have ranged from position coach to coordinator. One of those stops included a position at Summit High School (Oregon) where he helped coach a team from a two-win season to a 5A state title. Endemano has coached young men who have competed at every level of college football. Positions Endemano has coached include receivers, running backs, quarterbacks and defenisve line.
Nathan was a two-year starter at Cerritos College (California) where he helped the Falcons to a Potato Bowl victory. Following Cerritos Nathan attended Trinity International University in Deerfield, Illinois where he was a two-year starter. Nathan was the leading receiver both years at Trinity International with 1,864 yards on 118 catches. During his junior year Nathan was the leader in all-purpose yards for a team that qualified for the NAIA playoffs for the first time in 11 years. Nathan still holds two school records.
- Southern California - San Louis Obispo County south to Riverside and Orange County