Unincorporated Yellowstone County sets no general lawn-height rule; that is a city matter. Inside Billings, weeds, grass, and untended vegetation may not exceed twelve inches (12") in height from April 30 through September 30.
Montana counties do not impose a citywide grass-mowing standard on rural unincorporated land, so no county height limit applies there. The City of Billings, the county seat, defines 'nuisance weeds' as all weeds, grasses, noxious weeds, and untended vegetation growing in excess of twelve inches (12") in height on any premises. Property owners must cut or remove them during the weed season, roughly April 30 through September 30. If you live outside city limits, check whether your area falls under a county zoning district; most rural parcels have no mowing requirement beyond the mandatory noxious-weed control duty in state law.
In Billings the City may cut the weeds and bill the cost plus a 25% administrative charge, plus a $25 fine (first offense; $50/$75 for repeats); unpaid charges become a property lien.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Yellowstone County, MT
Under the Yellowstone County Parkland Ordinance, county parks close to public access one-half hour after sunset and open one-half hour before sunrise. No ove...
Yellowstone County, MT
Yellowstone County has no numeric light-trespass standard. In the zoning area, off-site glare can be limited (a home occupation may create none off-site) and...
Yellowstone County, MT
Yellowstone County has no dark-sky or outdoor-lighting ordinance for unincorporated land. County zoning near Billings limits glare that spills off a property...
Yellowstone County, MT
Yellowstone County has no dedicated garage-sale-sign ordinance. Signs may not be placed in or intrude into the public right-of-way and require the property o...
Yellowstone County, MT
Montana rules govern political signs statewide: they may be placed on private property only with the owner's permission, may not intrude into the public righ...
Yellowstone County, MT
Yellowstone County has no tiny-home ordinance. In the zoning area around Billings, a tiny house on a foundation is a dwelling and must meet the district's se...
See how Yellowstone County's grass height limits rules stack up against other locations.
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