He had been beaten on the head with some sort of blunt object, officials said.
Deputies from the Liberty County Sheriff's Office, Kennefick Fire Department and Liberty County EMS responded to the scene.
Emergency personnel said the man was transported to an area hospital. His condition was unknown Sunday.
There are no known witness, no suspect and no known motive for this assault.
LCSO deputies are investigating this incident and asking anyone with information about this crime to please call LCSO or visit the LCSO web site at www.libertytxsheriff.com and click the Crime Stoppers tab. All tipsters remain anonymous.