The fire was first reported at around 7:17 p.m. The blaze erupted not far from homes and moved quickly until Los Angeles County firefighters took control.
"It's steep hillside covered by brush," said volunteer firefighter Bruce Thomas. "Without the choppers, it probably would've gotten a little more nasty."
The winds blew the flames uphill and away from structures that were immediately threatened.
"I just saw the hillside in flames. The winds were blowing toward the mountains, which was a plus for us on the west side of La Habra Heights," said resident Mike Liscari.
A total of six acres burned as of 11 p.m., and only a few hotspots remained. There were no reports of injuries.
The cause of the fire was under investigation.