The Snow Fire burning northwest of Palm Springs had blackened 6,254 acres and was 80% contained Wednesday evening, with full containment expected Oct. 1.
The fire erupted Thursday afternoon in the 15000 block of Snow Creek Road, sparked by a vehicle fire, according to the Riverside County Fire Department.
One firefighter suffered injuries during the firefight on Saturday, according to U.S. Forest Service spokeswoman DeLyn Sieliet. The severity of the injuries was not disclosed.
No structure damage has been reported.
Firefighters have been working in high temperatures amid gusty winds and in steep, rugged terrain, the U.S. Forest Service reported.
Over the weekend, the flames were threatening about 450 homes in communities near Snow Creek and Windy Point, but firefighters mitigated the threat to those areas and canceled all evacuation orders Sunday and closed a temporary evacuation point in Cabazon.
After a work truck caught fire north of Snow Creek at about 2:40 p.m. Thursday, the fire spread to nearby vegetation and quickly grew to 1,200 acres by that evening.
The flames spread into the San Bernardino National Forest and the Santa Rosa and San Jacinto Mountains National Monument, prompting a multi-agency response.
A total of 232 firefighters remain assigned to the firefight from several agencies, including the U.S. Forest Service and Bureau of Land Management. They were being assisted by one water-dropping helicopter.