Jeffco has no separate garage-sale sign category; they fall under content-neutral "Temporary Ground Signs." Up to six per property need no permit, each up to 8 sq ft and 42 inches tall in residential zones, may not sit in the right-of-way, and may not be illuminated.
The Jefferson County sign code (Section 23) regulates signs by size, height, and location rather than by message, so a garage- or yard-sale sign is a Temporary Ground Sign under Section 23.D.1. Six are permitted per property with no permit. In all zone districts they may not extend outside the property line, exceed 42 inches in height, or exceed 8 sq ft per sign face; agricultural lots meeting minimum size may use up to 32 sq ft (10-foot setback, 10-foot max height). Signs placed in the public right-of-way, on utility poles, or on medians are prohibited. The county's rules apply in unincorporated areas; cities such as Lakewood or Arvada set their own sign rules.
Off-premise signs, signs in the right-of-way, or signs exceeding the size/height limits are prohibited and may be removed by the County under C.R.S. 30-28-124.
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See how Jefferson County's garage sale signs rules stack up against other locations.
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