Air tankers dropped fire retardant in the blaze's path to slow its advance, while firefighters on the ground battled to protect homes along a highway at the mountain's edge, including the upscale, gated community of Cedar Heights. No homes were reported burned, but the fire consumed a wooden tent platform.
"We're feeling pretty good that's the only thing we've lost given this monster we are dealing with," said Rob Deyerberg, a fire information officer.
The closures around Pikes Peak, billed as the world's second-most visited mountain after Japan's Mount Fuji, have drawn attention to the fire's negative impact on the tourism industry just at the start of the peak summer travel season.
After three days, the blaze has scorched an estimated 4,500 acres (1,821 hectares), and fire crews managed to carve containment lines around just 5 percent of its perimeter. The cause was still under investigation.
A recreation area belonging to the Air Force Academy was ordered evacuated due to its proximity to the fire, and all trails leading west of the school were closed, the base said.
Despite the fresh evacuations, the town of Manitou Springs, which had been evacuated over the weekend, appeared to remain out of imminent danger after residents were allowed back on Sunday.
Pam Staley, 60, a Colorado Springs resident, said she was concerned about the health effects of thick smoke and soot on many of her elderly neighbors who live in older homes without air conditioning.