A wildfire in the Rocky Mountains now covers 100,000 acres and has led to several communities being evacuated.
Nearly 920 firefighters are working in shifts tackling the 20-mile blaze in Colorado's foothills. It began on Saturday in the Pike National Forest and has destroyed at least 22 houses.
About 5,400 people remain out of their homes.
The fire slowed as temperatures fell and humidity rose, but no rain is forecast.
Despite wind gusts up to 30mph, the blaze has not advanced towards metropolitan Denver and remains about 35 miles away from the city.
Douglas County has lifted voluntary evacuations from several small communities between the fire and Denver suburbs.
At one point this week, 80ft flames shot towards firefighter Joey Bryan of Hot Springs, Arkansas. He said: "That's when you have to pull back to a safe place."
"Over the last two days the fire hasn't done much in that north-northeast section, so the areas aren't quite as threatened as we thought a few days ago," said Douglas County sheriff's spokesman Tim Moore.
Authorities are unsure of the fire's origin other than that it was human-caused. They have said it will take up to three months to contain.