Firefighters surrounded a 100-acre wildfire that shut down Interstate 80 for about four hours in the Sierra along the California-Nevada line.
U.S. Forest Service spokesman Franklin Pemberton said the blaze that has burned along both sides of the interstate was contained at noon Saturday and should be extinguished Monday.
"The fire season is off to an early start, but we're still optimistic we'll get some weather patterns to help stave it off," he said. "We're drier than normal and the potential for fire is there."
The Nevada and California highway patrols shut down a 25-mile stretch of the interstate in both directions west of Reno from about 3 p.m. to shortly after 7 p.m. Friday.
The fire's cause was under investigation but was believed to be human-related because there was no lightning Friday.
No major injuries were reported, and no structures were threatened.
Firefighting efforts were hampered initially by winds gusting to 20 mph in steep, rugged terrain. But cooler temperatures and higher humidity overnight allowed more than 130 firefighters to make major progress.
The fire scorched Humboldt-Toiyabe National Forest land about 20 miles west of Reno.
Fire officials are urging high school graduates not to stage bonfires on public lands because of this year's dry, hazardous conditions.