Each Johnson County city sets its own limit. Iowa City and Coralville both cap grass and weeds at 10 inches and mow neglected lots at the owner's expense. Unincorporated areas fall under the county nuisance ordinance instead.
Iowa gives cities home rule to abate overgrown lots, so the limit depends on which city you are in. Iowa City enforces a 10-inch maximum year round and also makes you mow the right-of-way strip next to your property; Coralville draws the same 10-inch line, and North Liberty sets its own limit in Code section 52.01. Outside city limits, Johnson County relies on its nuisance ordinance rather than a fixed height patrol, while the state noxious-weed duty still applies everywhere. Cultivated landscaping, gardens, and established native plantings are treated as maintenance, not neglect.
Iowa City gives seven days after written notice; miss it and the city hires a contractor to mow and adds the cost plus a $100 administrative fee to your bill. Coralville allows five days. Unpaid charges become a lien.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Johnson County, IA
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See how Johnson County's grass height limits rules stack up against other locations.
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