The fire began Friday west of Fort Collins and is burning near the scene of a large wildfire last summer that burned 259 homes and killed one person.
Officials say no homes are immediately threatened, but they have issued a second round of evacuation orders. They haven’t said how many people or homes are covered by the evacuations.
Some residents are being allowed back to their home to retrieve valuables and pets but are being warned not to stay.
The cause of the fire is under investigation.
Firefighters have controlled a second, smaller fire nearby.