A Colorado wildfire has forced hundreds of local residents to evacuate, and at least one person is reported missing, officials said.

The wildfire about 15 miles outside Fort Collins has charred around 14,000 acres and destroyed at least 18 buildings, Reuters reported.

The stiff winds and dry conditions make this very, very tough, Colorado Gov. John Hickenlooper said at a news conference.

The unincorporated town of Bellvue has been evacuated as winds spread the fire, with evacuation notices sent to 733 phones in multiple areas, according to the Denver Post.

About 250 firefighters are on the ground. One of them suffered from heat exhaustion, but no other injuries were reported. Aircraft are dropping flame-retardant materials on the blaze.

The cause of the fire, first reported Saturday, is under investigation.

Meanwhile, a nearby wildfire in New Mexico's Lincoln National Forest -- famous as the home of the real-life Smokey Bear -- has encompassed another 10,000 acres, Reuters said.