STATUS: Park County is in a Stage II Fire Ban until further notice.

The following acts are prohibited on all private property and all public property until further notice:

Building, maintaining, attending, or using a fire or campfire.
Smoking, except within an enclosed vehicle or building, a developed recreation site or while stopped in an area at least three feet in diameter that is barren or cleared of all flammable materials.
Operating a chain saw without a USDA or SAE approved spark arresting device properly installed and in effective working order, and have a chemical pressurized fire extinguisher of not less than 8 ounces capacity by weight, and possessing one large size pointed shovel with an overall length of at least 36 inches. The extinguisher shall be with the chain saw operator the shovel may be kept with the fueling supplies, but readily available for quick use.
Operating motorized vehicles off designated roads and trails.
Blasting, welding, or other activities that generate flame or flammable material.
Fireworks and recreational shooting.

Exemptions
Persons with a written permit that specifically authorizes the otherwise prohibited act.
Persons using a fire solely fueled by liquid petroleum or LPG fuels.
Gas engines including lawnmowers, weed eaters and generators.
Outside water heaters are allowed as long as the only thing burned in them is wood.
Persons conducting activities in those designated areas where the activity is specifically authorized by written posted notice.
Any Federal, State, or local officer or member of an organized rescue or firefighting force in the performance of an official duty.

It's probably OK but to be sure ask the Lake George Fire Department at 719-748-3022, they cover the 11 Mile area.

UPDATE: I happened to meet the Chief of LG Fire and asked him. Answer is an emphatic "NO". Reason is the blades can pick up minor amounts of gravel that cause sparks.
NO LAWNMOWING