The Klamathon Fire is one of about a dozen blazes Cal Fire is battling across the state, the largest located in Northern California.
Cal Fire and the Siskiyou County Sheriff's Office confirmed the death, but no further details were released.
A fire that jumped across Interstate 5 south of the OR border in California has closed the southbound lanes in that area, authorities said. Crews said at 6 a.m. that the fire is about 5 percent contained.
The county issued a local emergency declaration, saying the fire "is causing conditions of extreme peril to the safety of persons".
In a Utah mountain area, a wildfire that destroyed 90 structures and forced more than 1,100 people to flee was growing, but fire officials hoped to gain more control after their work Friday.
The Holiday Fire, one of more than three dozen major blazes burning across the U.S. West, broke out on Friday evening near the beach community of Goleta, California, South of Santa Barbara, and raced through the seaside foothills.
Elsewhere in California, a massive blaze northwest of Sacramento had destroyed nine homes, officials said. The department says multiple structures are threatened, damaged or destroyed.
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There is now no danger to Isla Vista, according to Santa Barbara County Fire Public Information Officer Mike Eliason.
Some 3,660 firefighters faced with inaccessible terrain, high temperatures and low humidity, were battling the fire, which was only 48 percent contained. Hundreds of people living and working in the vicinity have been evacuated.
"We are still in the early stages of aggressively attacking this fire with both ground and air resources", she said.
Flames ravage a home in Goleta on July 7, 2018.
About 75 miles east of Los Angeles, a wildfire in the San Bernardino National Forest prompted mandatory evacuations for the entire community of Forest Falls, which has about 700 homes and about 1,000 residents.
Fires have razed through more than 2.8 million acres in the United States this year through Thursday, above the average of about 2.4 million acres for the same period over the last 10 years, according to the National Interagency Fire Center. As the wildfires burn across the state, Cal Fire relies on local departments' strike teams for aid.