The unidentified man climbed to the top of the Supreme Scream ride at about 7:20 p.m. Saturday and came down around 9 p.m., according to Buena Park police.
"Knott's Berry Farm became aware of a male who had accessed a unauthorized area and climbed the Supreme Scream tower. Park personnel alerted local law enforcement and emergency responders who are now on site. The guest descended the tower at 8:55 p.m. and is now currently safely on the ground in police custody. No other information is available at this time. The safety of our guests is always our top priority," the theme park said in a statement.
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The Orange County Fire Authority prepared for a technical rescue, officials said. "Once the individual was secured, our firefighter paramedics assessed and transported him to a local hospital.''
It was unclear how the man managed to climb to the top of the ride or if he will face any charges.
La Palma Avenue was temporarily closed between Beach Boulevard and Western Avenue, and police asked the public in a tweet to stay away from the area.
City News Service contributed to this report.