The single-acre fire was reported about 12:15 p.m. near the Seventh Street offramp, prompting a response from 70 firefighters, the Los Angeles Fire Department said.
The blaze, which involved multiple palm trees, was extinguished in just under two hours, the Fire Department said. Firefighters were conducting mop-up operations to ensure that no hotspots flared up.
The freeway shutdown snarled midday traffic in the area as drivers were forced to seek alternative routes.
Caltrans crews worked to clear the scene and westbound lanes reopened just before 4:50 p.m., officials said.
The cause of the fire was not immediately known.