A man has died following a trail bike crash on the NSW South Coast near Nowra.

About 430pm yesterday, Wednesday 10 January, emergency services responded to reports a man riding a trail bike had crashed into a tree in bushland, near the Old Quarry off Parma Fire trail, in Yerriyong, about 18 km south-west of Nowra.

Two men performed CPR before emergency services arrived.NSW Ambulance paramedics responded, finding a 21-year-old man unresponsive. They performed CPR but the man was unable to be revived and he died at the scene.

Officers attached to South Coast Police District attended and established a crime scene.

A report will be prepared for the Coroner.