If the sidewalk is attached to the curb, the City is responsible. If the sidewalk is separated (detached) from the street curb, the property owner is responsible for repairing and constructing the sidewalk along the property frontage. https://library.municode.com/co/fort_lupton/codes/municipal_code?nodeId=CH11STSIPUPR_ARTISICUGU
Snow removal, mowing, tree maintenance, and removal (if needed) are the responsibility of the homeowner.
Municipal Code Sec. 7-81. - Unlawful weed, grass, or brush growth.
It is unlawful for any person, corporation, or other entity who is the owner, lessee, occupant, or person in control of any lot, tract, or parcel of land in the City to permit or maintain on any such lot, tract, or parcel of land or on, or along the sidewalk, street or alley adjacent to the same, between the property line and the curb or middle of the alleyway or to the edge of the roadway if no curb exists, any growth of weeds, grass or brush to a height greater than six (6) inches or in any manner that would constitute a fire hazard.
Municipal Code Sec. 7-82. - Weed, grass, brush, or debris; removal required.
It is unlawful for any person, corporation, or other entity who is the owner, lessee, occupant or in control of any lot, tract, or parcel of land in the City to fail to remove any weeds, grass, or brush required to be cut by the provisions of Section 7-81, and, further, it shall be unlawful to fail to remove all such weeds or brush and immediately dispose of the same.