Sign Regulations in Boulder, CO

If you live in Boulder or are thinking about moving there, sign regulations are one of those things you probably won't think about until they affect you directly. Boulder has 3 specific rules on the books covering different aspects of sign regulations, and some of them might surprise you.

Digital Billboards

Boulder's sign code bans off-premises billboards outright: Section 9-9-21(b)(3)(H) prohibits any commercial sign that is not appurtenant and clearly incidental to the property where it stands. On-premises electronic signs are allowed, but 9-9-21(b)(3)(G) treats any electronic message change more often than once per minute as a banned 'moving' sign rather than a permitted copy change.

Key details: Off-premises billboards: prohibited citywide. Max electronic message change rate: once per minute. Governing section: Land Use Code § 9-9-21(b)(3)(G), (H). Rotating cylindrical sign exception: 12 in. diameter, 30 in. tall. Residential/agricultural illumination cutoff: 11:00 p.m..

Erecting, displaying or maintaining an off-premises billboard anywhere in the city violates Section 9-9-21(b)(3)(H) and carries no permit exception. An on-premises electronic sign that changes its message more than once per minute loses its copy-change exemption and becomes a prohibited moving sign under 9-9-21(b)(3)(G). The city manager administers the sign code, and violations can be appealed to the Board of Zoning Adjustment and Building Appeals.

This is not one of those rules that cities tend to ignore. Boulder actively enforces its digital billboards requirements.

Window Signs

Boulder exempts small window signs from a sign permit, but only within limits: Section 9-9-21(c)(1)(L) allows a non-illuminated window sign up to four square feet, no higher than twenty-five feet above grade, covering less than twenty-five percent of the window. A window sign over four square feet placed twelve feet or higher is a prohibited 'high window' sign under 9-9-21(b)(3)(D).

Key details: Exempt window sign max area: 4 square feet. Max height above grade: 25 feet. Max window coverage: under 25% of window. High Window ban threshold: >4 sq ft at 12+ feet. Governing section: Land Use Code § 9-9-21(c)(1)(L).

A window sign larger than four square feet placed twelve feet or higher above the ground violates the 'High Window' prohibition in Section 9-9-21(b)(3)(D) regardless of any permit. An exempt window sign that exceeds four square feet, covers twenty-five percent or more of the window, or is illuminated loses its permit exemption under 9-9-21(c)(1)(L) and must instead meet the standard sign-permit requirements of subsection (b)(2).

Political Signs

Boulder treats a political sign as a noncommercial sign exempt from standard area and setback limits, but caps it at one sign, seven feet tall and thirty-two square feet, within twenty-five feet of a sidewalk in a residential zone. Section 9-9-21(d)(9)(B) lifts the one-sign limit during an active campaign, allowing extra signs in the setback up to twelve square feet each.

Key details: Standard setback sign limit: 1 sign, 7 ft, 32 sq ft. Campaign-period extra signs: 12 sq ft each. No limit beyond: 25 ft from sidewalk. Campaign window starts at: candidate nomination/ballot certification. Governing section: Land Use Code § 9-9-21(d)(9).

Placing more than one noncommercial or political sign within the twenty-five-foot residential setback outside of an active campaign window violates Section 9-9-21(d)(9)(B). Even during a qualifying campaign, an added setback sign larger than twelve square feet, or with a face over six square feet, exceeds the size cap set by the same subparagraph and is subject to the city manager's standard sign-code enforcement.

If you are coming from a city with tighter rules, you will find Boulder gives residents more flexibility on political signs.

The Bottom Line

Boulder's sign regulations rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Boulder is broadly strict or permissive.

Keep in mind that Boulder can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.