By 6 p.m. fire crews had stopped the blaze that started shortly before 1 p.m. Thursday along a hillside south of McKinley Street and Indiana Avenue from spreading farther, according to the Riverside County Fire Department.
Crews were expected to remain on the fire lines throughout the night mopping up and watching for flare-ups, according to fire officials.
The blaze had came dangerously close to homes Thursday, but no structures were burned.
As many as 500 firefighters were on the ground battling the fire, with the help of four air tankers and three helitankers.
One firefighter twisted his ankle fighting the fire, and no other injuries have been reported.
Firefighters believe mowing equipment sparked the fire.