O'Fallon, MO Tree Protection: Parkway Planting (2026)

110, "Tree Standards Along A Roadway," splits O'Fallon's street-tree rules by road classification. 110(A) requires one (1) tree in the front yard of every lot, a second on the street-facing frontage of a corner lot, and bars new trees from the right-of-way altogether; where a tree is planted near the street, it must sit at least fifteen (15) feet from the back of curb and stay five (5) feet clear of any underground utility or lateral line, unless a development plan says otherwise. 110(B) instead sets a density standard, one (1) tree for every fifty (50) linear feet of frontage as required by the zoning district, and allows trees inside the City right-of-way only if a landscaping plan has been reviewed and approved; any tree that ends up within fifteen (15) feet of the back of curb must be an "acceptable species" from the City's tree list and stay clear of a ten (10)-foot easement.

130, adds citywide placement buffers along any roadway: no tree may sit within twenty-five (25) feet of a street light or traffic sign, and none may go within ten (10) feet of a stormwater inlet or manhole. Together, these standards steer street trees away from sightlines, utilities and drainage infrastructure while still requiring a planted canopy along every residential frontage in the City.