The Lillis Lane Fire broke out Thursday, forcing the evacuation of residents for a short period of time, KCNC-TV, Denver reported.
The fire was contained by early afternoon, an official said.
Investigators said they were trying to determine if the wildfire was started by illegal fireworks.
"Talking with the homeowners they've indicated that there were fireworks in the area ... it will be part of our investigation," said Jackie Kelly, spokeswoman for the Jefferson County sheriff.
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