Firefighting officials said the fire on Perrins Peak northwest of Durango was most likely caused by people.
The wildland fire that broke out Tuesday afternoon has burned 105 hectares on grounds owned by the Bureau of Land Management and Colorado Parks and Wildlife.
They also suspect people contributed to the Perins Peak fire and have hired an investigation team to investigate the source of the blaze.
For County Road 208 and the section Dry Fork and Rock Ridge as well as County Road 206 to Colorado 160 pre-evacuation was issued.
Crew members were on site for the first time on Wednesday morning having been prevented by safety concerns and rough terrain from preventing firefighters from extinguishing the blaze on Tuesday evening.
The blaze was expected to flare up throughout the afternoon on Wednesday as temperatures in the fire zone rise well into the mid-70s.