A fire that has burned 3,000 acres of vegetation near Banning is 40% contained, the Riverside County Fire Department reported Thursday morning.
In addition, a second firefighter was injured overnight while holding the line and one home has been destroyed.
Evacuation orders were lifted Wednesday night for a mobile home park and other areas that were threatened earlier in the day as strong Santa Ana winds pushed the Summit fire's flames across Riverside County's parched mountainside areas, officials said.
Firefighters were able to take advantage of a lull in the winds, which earlier were gusting up to 35 mph. The blaze had burned 2,956 acres of medium to light vegetation as of Wednesday night, the Riverside County Fire Department said.
By Thursday morning, the winds were down to 28 mph with 40 mph gusts and a relative humidity of 10%, according to the California Department of Forestry and Fire Protection.
Evacuation orders were lifted for residents of the Highland Springs Mobile Home Park, where firefighters made a stand Wednesday evening as flames burned toward the area.
Earlier, at least 500 people had been evacuated as hundreds of firefighters from several jurisdictions worked to beat back the flames. They were being aided by a dozen helicopters and air tankers that made repeated water and fire-retardant drops.
Several horses were also evacuated, the Riverside County Department of Animal Services said.
Officials warned Wednesday that a relatively dry winter coupled with summer weather could portend a devastating fire season in Southern California and other areas of the West.
"Significant fire potential will be above normal" for Southern California and other areas of the West, the National Interagency Fire Center in Boise, Idaho, said in its first outlook report for the 2013 fire season.
State fire officials said they had responded to more than 680 wildfires since the start of the year. That's more than 200 over the average for the period, the agency said.
In the Banning blaze, fire officials said they were hoping to make some headway in stopping the blaze before stronger Santa Ana winds and warmer weather hit the region on Thursday.
Temperatures in the 90s and wind gusts up to 75 mph could hit mountain areas by Thursday afternoon, according to the National Weather Service.
The agency issued a red-flag warning and a high-wind advisory Thursday, signaling critical fire danger due to the winds, warm temperatures and low relative humidity.