Sign Regulations in Idaho (2026)
27 rules on the books across Idaho, 8 cities and counties. Select a rule to read the full details.
Severity: Few Restrictions · Light Restrictions · Some Restrictions · Significant Restrictions · Heavy Restrictions
Political Signs
Rules for posting political campaign signs on your property, including size limits, how early you can put them up, and when they must come down.
Idaho: statewide
StatewideSome RestrictionsIdaho Code 55-3209 prevents homeowners associations from prohibiting political sign displays statewide. HOAs may impose…
Read full rule →Ada County
Some RestrictionsAda County's sign code is content-neutral, so it does not single out political signs. Temporary signs, including yard…
Read full rule →Caldwell
Some RestrictionsCaldwell bans political signs, banners and campaign literature within 100 feet of a polling place entry door on…
Read full rule →Kootenai County
Some RestrictionsKootenai County's sign code has no separate category for political signs. In residential and agricultural zones…
Read full rule →Boise
Light RestrictionsBoise exempts political signs from permit requirements as long as they stay off the public right-of-way and don't block…
Read full rule →Garage Sale Signs
Where you can place signs advertising a garage or yard sale, including restrictions on utility poles, medians, and public right-of-way.
Ada County
Some RestrictionsGarage-sale signs fall under Ada County's content-neutral temporary-sign rules. No permit is needed: residential lots…
Read full rule →Caldwell
Some RestrictionsCaldwell limits garage-sale advertising to four temporary signs per sale, each capped at six square feet, and requires…
Read full rule →Kootenai County
Some RestrictionsKootenai County has no garage-sale-sign-specific rule. A garage sale sign on your own property is a temporary…
Read full rule →Meridian
Some RestrictionsMeridian limits garage-sale signs to four per sale, six square feet each, requires the property owner's permission to…
Read full rule →Holiday Displays
Rules for seasonal decorations, lights, inflatables, and lawn displays, including the sign-permit exemptions most codes give them and any limits on timing, size, or placement.
Ada County
Some RestrictionsAda County Code 8-3-8(C)(3) exempts temporary holiday lighting from the county's outdoor lighting standards, but only…
Read full rule →Boise
Few RestrictionsBoise exempts religious symbols and seasonal decorations from sign permits, with no code-set start or removal date for…
Read full rule →Meridian
Few RestrictionsMeridian exempts holiday lighting from its outdoor lighting standards, including lumen caps and cutoff-shield rules, as…
Read full rule →Digital Billboards
Rules governing digital and electronic billboards, including size limits, brightness and dwell-time standards, and the ongoing legal fight in cities like LA.
Meridian
Heavy RestrictionsEvery off-premises billboard in Meridian is classified nonconforming, so no new ones can be permitted, and any sign…
Read full rule →Boise
Significant RestrictionsElectronic billboards in Boise must show static frames only, changing no more than once every 8 seconds, with strict…
Read full rule →Bonneville County
Significant RestrictionsBonneville County bans movement and flashing on LED and tri-vision billboards under County Code § 152.30(D): every…
Read full rule →Caldwell
Significant RestrictionsDigital signs in Caldwell's commercial and industrial districts must attach to a permitted monument sign, stay under 25…
Read full rule →Idaho Falls
Significant RestrictionsIdaho Falls bars new billboards within 750 feet of another billboard, the Snake River corridor, or a historic property…
Read full rule →Kootenai County
Significant RestrictionsKootenai County has no standalone digital billboard category; it regulates the technology as an electronic message…
Read full rule →Ada County
Some RestrictionsAda County Code 8-3-12(K) caps animated and electronic message content on billboards at 20% of the sign face, limits…
Read full rule →Nampa
Some RestrictionsDigital billboards are allowed in Nampa's commercial, industrial, and other nonresidential zones, but LED billboard…
Read full rule →Window Signs
Limits on the percentage of window area that may be covered by signs in storefronts, including transparency rules for safety visibility into businesses.
Boise
Some RestrictionsBoise lets window signs cover up to 25 percent of a window's area without a sign permit; go over that and the sign…
Read full rule →Caldwell
Some RestrictionsCaldwell caps window signage at 25 percent of the window area on each building façade. City Code § 10-02-06-8(2)(F)…
Read full rule →Idaho Falls
Some RestrictionsIdaho Falls bars signs from covering a window, door, or opening required by the adopted Building or Fire Code for…
Read full rule →Kootenai County
Some RestrictionsUnincorporated Kootenai County caps window, wall, awning and canopy signs by zone. Commercial, light industrial and…
Read full rule →Meridian
Some RestrictionsIn Meridian, window signs count toward a business's overall building sign allowance and are capped at one square foot…
Read full rule →Bonneville County
Few RestrictionsBonneville County exempts window signs from its sign permit process. Under Code § 152.32(I), a sign displayed inside a…
Read full rule →Freeway-Facing Signs
Restrictions on commercial signs visible from freeways, including height, illumination, and outdoor advertising act compliance.