Garage-sale signs are allowed on your own property in unincorporated Clay County as temporary signs under Land Development Code Sec. 151-12.8, with size and time limits. Off-premise directional signs in the road right-of-way or on utility poles are prohibited and removed.
Clay County's Land Development Code, Section 151-12.8, covers temporary signs including yard- and garage-sale advertising on private property; a sign at the sale location is allowed without a separate permit, subject to size and duration limits and removal after the event. The problem is the directional signs people stake at intersections: placement in a public road right-of-way, on utility poles, or on other public property is prohibited, and county or MoDOT crews remove them — MoDOT controls signs along state highway rights-of-way under §§226.500 to 226.600. Inside a city, the municipal sign code and any garage-sale permit rules apply instead. In a subdivision, HOA covenants may add limits.
Signs in the road right-of-way or on utility poles are removed by the county or MoDOT, and repeat roadside placement can draw a zoning citation. Signs left up after the sale are treated as an abandoned temporary sign and removed.
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