Firefighters were working to clear the minimal fire activity that's left in the 2,600-acre blaze, up from 2,000 acres, officials said.
Meantime, the Corona-Norco Unified School District resumed classes on Thursday and no evacuation orders were in place.
Hundreds of Corona-area homes were initially threatened by the fire that broke out Monday at about 1 p.m. near the eastbound 91 Freeway at Coal Canyon Road.
There were no reports of injuries in the fire, which damaged six homes and destroyed the trailer of a semi-truck, according to the Orange County Fire Authority.
Fire officials were asking residents to avoid recreational use of Skyline Drive due to heavy equipment working in the area throughout the weekend.
A unified command was composed of the Anaheim, Corona, and Los Angeles County fire departments, the OCFA, U.S. Forest Service and Cal Fire.
The cause of the fire was unknown.
VIDEO: Surveillance video shows Canyon Fire dangerously close to Corona home