Landscaping Rules in O'Fallon, MO (2026)
5 verified landscaping rules for O'Fallon, Missouri, sourced directly from the municipal code and official government pages.
Verified from official government sources
Tree Trimming
O'Fallon makes it a nuisance to let trees, shrubs or other vegetation block the view at a street intersection: nothing taller than two feet above the street crown may sit within twenty-five feet of the curb. The City can enter the property and remove the obstruction after notice.
O'Fallon Requires Trees Trimmed at Intersections
Some RestrictionsO'Fallon Code § 220-105(A), (C)
It shall be unlawful and a nuisance for the owner of any lot alongside any intersecting street or alongside any street which enters or runs into another street to have or permit any fence, sign, signboard or billboard to be erected nearer than twenty-five (25) feet to the curb of such street or to erect such structure to a greater height than two (2) feet above the crown of the street at the po...
Tree Removal & Heritage Trees
O'Fallon bars clearing more than 25% of the trees on a parcel ahead of development, and once a site plan is filed, at least 20% of existing trees or 15 trees per acre, whichever is greater, must be retained. Single- and two-family lots are exempt.
O'Fallon Tree Removal & Protection Rules
Some RestrictionsO'Fallon Code § 402-040(A)
Prior To Development. The destruction of more than twenty-five percent (25%) of the trees on any one parcel shall be prohibited. However, where the topography of the land is such as to necessitate extensive grading or filling to make the land suitable for future development, upon grading permit approval, that portion of the parcel of land graded or filled shall be exempted from application of t...
Weed Ordinances
O'Fallon caps weeds, brush and grass at eight inches tall on any improved lot with a building or structure, and the same limit runs twenty feet back from the curb along every public or private street. The Code Enforcement Officer measures four random spots to confirm a violation before acting.
O'Fallon Caps Weeds at 8 Inches on Lots
Some RestrictionsO'Fallon Code § 220-100(I)
The term "weeds", as used in this Section, shall mean any weed, brush, vegetation or grass more than eight (8) inches in height along any public or private street for a minimum depth of twenty (20) feet back from the outer edge of the curbing or the outer edge of the pavement if no curbing exists; and eight (8) inches in height elsewhere on improved property on which a building or structure is ...
Water Restrictions
O'Fallon's Water Conservation Plan lets the City order mandatory lawn-watering restrictions once a drought or shortage threatens the water system, starting with odd/even-day watering by street address and escalating to a full ban on lawn, garden and tree watering except by hand-held container. Violators face fines up to $500 per day and water service disconnection.
O'Fallon Lawn Watering Restrictions
Significant RestrictionsO'Fallon Code § 700.290
If a disaster occurs, severe conditions exist, and/or voluntary water curtailment or restrictions are requested and demands on the water system continue to indicate that the threat of a water shortage will continue or occur, the City or its agents shall immediately implement any parts of the below conservation plan as it deems necessary: 1. Mandatory Restriction Of Lawn Watering. Even numbered ...
Native Plants
O'Fallon's eight-inch mowing rule doesn't apply to unimproved land over two acres kept as natural forest or native prairie grass, as long as the growth doesn't bother neighbors. Homeowners with a stormwater detention basin can also get a City permit to convert it to native grasses instead of turf.
O'Fallon Exempts Large Native Prairie Land
Light RestrictionsO'Fallon Code § 220-100(K)
The requirements of this Section shall not apply to any real property within the City limits which meets all of the following requirements: 1. Is not improved with any building or structure; 2. Is more than two (2) acres in size; 3. Is maintained as a natural forested area or natural grassland containing native or prairie grasses; and 4. Where the growth of such vegetation is compatible with th...
Looking for St. Charles County county-wide rules?
County ordinances apply to unincorporated areas and may supplement O'Fallon city rules.
Landscaping Rules in St. Charles County →