On residential lots of 2.5 acres or less, brush, shrubs, grasses, and weeds must generally be kept under nine inches. Growth over nine inches that causes a nuisance violates Land Use Code Article 14; designated noxious weeds fall under the county's mandatory Weed Management Plan.
Article 14 defines regulated 'weeds and brush' as any underbrush, bush, shrub, or plant material greater than nine inches in height that grows without cultivation and is allowed to grow so as to cause a public hazard or nuisance. This applies to residential lots of two and one-half acres or less. Planting beds, cultivated gardens, and food-production plots are excluded, and state-designated noxious weeds are handled under the County Noxious Weed Management Plan (C.R.S. 35-5.5) rather than Article 14. Cities enforce their own grass-height rules within their limits.
Written notice with an abatement deadline (ordinarily 30 days). If uncut, the county mows and bills the owner, adding up to a 10% inspection charge; unpaid amounts add a 10% penalty and go to the county treasurer.
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See how Boulder County's weeds & overgrown grass rules stack up against other locations.
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