Local zoning · Humboldt County

Humboldt County — Signage

Q: What are the maximum sizes for common sign types (monument, wall, freestanding)?

The Appurtenant Sign Table caps monument signs at 36 sq ft (max height 7 ft ), wall signs at 2 sq ft per linear ft of facade (max 100 sq ft ), and freestanding signs commonly at 64 sq ft and 18 ft tall — see § 87.2.6.5 for full details.

Q: Can I put a digital or LED message board on my property in unincorporated Humboldt County?

No — digital, animated or changeable-copy signs are generally prohibited , except limited exceptions such as approved fuel price signs, barber poles, and time/temperature signs in commercial/industrial zones ( § 87.2.13.1 ).

Q: When is a Master Sign Plan required?

A Master Sign Plan is required for sites greater than 1 acre , sites with tenant spaces above the first floor, or any nonresidential development/building/property with 4 or more tenants ; see § 87.2.7.1 .

Q: Who reviews Creative Signs and how are they approved?

Creative Signs require a Special Permit and review/approval by the Zoning Administrator; they must meet General Design Standards and at least three of the Sign Features/Materials/Contextual Criteria listed in § 87.2.9 . Early coordination with planning staff is recommended.

Signage under the Humboldt County local zoning and planning code, with the controlling citations.

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Last reviewed: July 3, 2026

Overview

This page summarizes the Humboldt County Zoning Code rules that govern signs in the unincorporated areas of Humboldt County (the local sign regulations are located in Article 87 — “Signs” of the Zoning Code). It covers what sign types are permitted or prohibited, dimensional and illumination standards, the Master Sign Plan and Creative Sign processes, and the zone-specific allowances and limits that matter to applicants. All citations point to the County ordinance text (see Source References).

Where the rules live

The sign rules appear in Article 87 of the Humboldt County Zoning Code (primarily § 87.2 and related subsections). For definitions (for example "Sign" and "Sign, Area") see the code definitions. § 87.2.1 lays out purpose and applicability.

Note: these standards apply only in the unincorporated areas governed by the County zoning code; incorporated cities in Humboldt County use their own sign codes. Before you build, confirm the parcel is in unincorporated Humboldt County with the County planner. For general land-use context see Humboldt County Zoning & Planning Overview and the Humboldt County Zoning pages (/us/california/humboldt-county and /us/california/humboldt-county/zoning).

High-level rules and permit triggers

No permit is required for changes to a legal existing sign face or for installation of historic plaques (§ 87.2.2.1) .
Temporary signs up to 32 sq ft are principally permitted when they meet the timing and placement rules in § 87.2.4 (e.g., event banners, political signs) .
Nameplates are limited by zone (see the district table below) — e.g., in U, FR, AE, AG, FP one nameplate up to 20 sq ft; in any zone except RS, R-1, R-2 one nameplate up to 4 sq ft; otherwise 2 sq ft (§ 87.2.3) .
Appurtenant signs (signs that identify a business on the property where it’s located) are treated differently by zone and sign type; dimensional limits are in § 87.2.6 and the Appurtenant Sign Table in § 87.2.6.5 (see the summarized table below).
Creative or artistically unique signs are allowed but require a Special Permit and review by the Zoning Administrator; Creative Signs must meet the General Design Standards and at least three of the listed quality/ contextual criteria (§ 87.2.9) .
Directional/guide signs have a specific size cap (maximum display surface 24" x 24" per use, aggregate not to exceed 100 sq ft) and require a Special Permit (§ 87.2.11) .
Electronic, animated, or changeable-copy signs are generally prohibited except narrowly for approved fuel price displays, barber poles, and time/temperature signs in commercial/industrial zones (§ 87.2.13.1) .
Signs on public rights-of-way or public property are prohibited unless expressly permitted by the responsible public agency (§ 87.2.13.7–.8) .

When signage touches landscaping, screening, setbacks, circulation or parking islands, consult the County’s development and site standards: see Humboldt County Development Standards and Humboldt County Parking. Use the County’s Design Review process for signs that are part of larger site design proposals: Humboldt County Design Review.

District-by-district breakdown

Below are the zone names used by the County sign rules and the specific sign-related treatment the ordinance gives them. (The Zoning Code contains full zone purposes and permitted uses elsewhere; here we limit descriptions to the sign rules in Article 87.)

RS, R-1, R-2

What the sign rules say: Signs are generally prohibited in RS, R-1, and R-2 unless allowed by a Use Permit (§ 87.2.6.1) .
Typical effect: Residential parcels should plan on no commercial-style appurtenant signs unless a Use Permit is obtained. Nameplate limits still apply (see § 87.2.3) .
Verify: whether the specific parcel is within an overlay or special area that modifies signage (see Humboldt County Overlay Districts).

Commercial Zoning Districts

Sign status: Signs are principally permitted in Commercial districts when appurtenant to a permitted use (§ 87.2.6.2) .
Key dimensional standards (from the Appurtenant Sign Table § 87.2.6.5): wall sign area up to 2 sq ft per linear foot of facade (maximum 100 sq ft per facade); monument signs up to 36 sq ft (height 7 ft, width 12 ft); freestanding signs up to 64 sq ft and 18 ft tall (see table) .
Other rules: internally or externally illuminated signs are allowed in nonresidential zones except where specifically prohibited (§ 87.2.12.1.1) .

Industrial Zoning Districts

Sign status: Signs are principally permitted in Industrial zones when appurtenant to a permitted use (§ 87.2.6.2) .
Dimensional standards: follow the Appurtenant Sign Table in § 87.2.6.5 (see table) .
Illumination: internal lighting allowed unless specifically prohibited (§ 87.2.12.1.1) .

U, FR, AE, AG, FP (Unclassified / Rural / Agricultural / Floodplain)

Nameplate allowance: one nameplate up to 20 sq ft in U, FR, AE, AG, and FP zones (§ 87.2.3.1) .
Appurtenant signs: If the property has a commercial services or industrial general land use designation, signs may be principally permitted (see § 87.2.6.2) .
Limitations: in other unclassified or rural contexts the County may permit only limited signage or require special approvals — verify with staff.

All Other Zones / Mixed or Special Cases

In “all other zones,” the code allows up to three single‑sided signs (or one double‑sided + one single) not exceeding 75 sq ft aggregate with a Special Permit; otherwise signs not meeting the Appurtenant Sign Table require a Conditional Use Permit (§ 87.2.6.3–6.4) .
Master Sign Plans are required for sites over 1 acre, multi-tenant sites above the ground floor, or nonresidential developments with 4+ tenants; Master Sign Plans may be principally permitted if consistent with § 87.2.6.5 or may require a Special Permit to vary allocations (§ 87.2.7.1–.4) .

Key design, illumination and safety standards

Illumination: signs in nonresidential zones may be internally or externally illuminated except where specifically prohibited; signs in residential zones must be externally illuminated and be at least 50 ft from any residence (§ 87.2.12.1.1–1.2) .
Brightness cap: between sunset and sunrise luminance is limited to 100 candela per square meter; either the sign must be designed to meet this or include an automatic light-sensing dimmer (§ 87.2.12.1.4.1–.4.2) .
Shielding and glare: light must be shielded and directed at the sign face so it is not visible from adjacent properties or public streets; exposed bulbs are prohibited unless allowed via a Creative Sign permit (§ 87.2.12.1.5–.1.8) .
Traffic safety: signs cannot obstruct sight distance, simulate traffic devices, or use words/colors confusing to drivers (e.g., "STOP", red/green/amber in locations that could be confused with traffic signals) (§ 87.2.13.5 and related subsections) .
Public property and rights-of-way: signs on public roads, rights-of-way or public property are prohibited unless the responsible agency authorizes them (§ 87.2.13.7–.8) .

Appurtenant sign quick-reference table

Sign type	Key limits (decision-relevant)	Code Reference
Monument	Max 36 sq ft, max width 12 ft, max height 7 ft; 1 per frontage	§ 87.2.6.5
Wall	2 sq ft per linear ft of facade, max 100 sq ft per facade; max depth 18 in, edge clearance 7 ft	§ 87.2.6.5
Projecting / Banner	Max 25 sq ft, max projection 4 ft, clearance 8 ft, distance to curb 2 ft	§ 87.2.6.5
Awning/Canopy	One per window; projection 4 ft max; valance height 12 in	§ 87.2.6.5
Window	Up to 25% of glass per facade (seasonal displays excluded)	§ 87.2.6.5
A‑frame / Standing sign	2 per business, area 8 sq ft each (standing); feather banners limited, cannot obstruct ROW or ADA	§ 87.2.6.5
Freestanding	Typical max 64 sq ft, width 8 ft, height 18 ft, clearance 8 ft	§ 87.2.6.5
Fuel price display	Up to 64 sq ft and height 18 ft; price displays may be changeable LED	§ 87.2.6.5
Directional	Max 24" x 24" per use, aggregate max 100 sq ft; Special Permit required	§ 87.2.11.3

Special processes that matter

Master Sign Plan: Required for sites > 1 acre, for sites with tenant spaces above the first floor, or any nonresidential development with 4+ tenants; allows site-wide coordination and—if a Special Permit is obtained—pooling or reallocation of sign area between tenants (§ 87.2.7.1–.4) .
Creative Sign: For distinctive/arts-based signs (up to 40% digitally printed) that deviate from standards; must get a Special Permit, meet design standards and gain Zoning Administrator approval (§ 87.2.9.1–.3) .
Billboard regulation and change: New billboards within 660 ft of a state highway are generally prohibited; there is a regulatory framework and limited replacement/conditional provisions for existing lawful billboards (§ 87.2.13.2 and § 87.2.10) .

Checklist

Confirm parcel is in unincorporated Humboldt County and identify the zoning district (verify with County planner).
Identify the sign type (nameplate, wall, monument, freestanding, temporary, fuel price, directional, Creative sign) and find the applicable limits in § 87.2.3–§ 87.2.13.
Confirm whether the sign is principally permitted, requires a Special Permit, Use Permit, or Conditional Use Permit (e.g., residential zones: signs generally prohibited without Use Permit — § 87.2.6.1).
For illuminated signs, ensure compliance with shield/brightness/operation rules (50 ft rule in residential zones; 100 cd/m² night cap; operating hours) (§ 87.2.12)
If multi-tenant or >1 acre, prepare a Master Sign Plan per § 87.2.7.
Confirm sign will not be located on public property or in a public right-of-way without agency authorization (§ 87.2.13.7–.8)
Avoid prohibited features: electronic/animated/changeable copy (except specified exceptions), roof signs, signs on natural features, and traffic-confusing designs (§ 87.2.13)
If the sign might trigger design review, coordinate with the County’s Design Review process and check for overlay or historic preservation constraints (see Humboldt County Design Review and Humboldt County Historic Preservation).
Apply for the appropriate County permit and include any required site plans, elevations, illumination cut sheets, and Master Sign Plan materials where applicable. Verify whether a building permit is required separately (verify with the County and see the California Building Standards Code).

Risks & Ambiguities

Issue	Why it matters	What to verify
Zone-specific prohibitions in RS/R-1/R-2	Signs are generally prohibited unless a Use Permit is obtained — surprises at plan check can delay projects	Confirm exact zoning and whether the property has a Commercial/Industrial General Land Use designation that alters sign permissibility (§ 87.2.6.1–.2)
Interpretation of “appurtenant” or mural vs. advertising	Murals that do not advertise are exempt; advertising text/logo converts mural to regulated sign	If the artwork includes business names/logos it becomes a sign under the code — confirm intended content and cite § 87.2.8
Creative Sign subjective review	Creative signs are evaluated on artistic and contextual criteria and require a Special Permit; outcomes are discretionary	Early pre-application review with the Zoning Administrator is recommended; review § 87.2.9 criteria
Electronic/changeable copy exceptions	Fuel-price displays and certain small displays are allowed, otherwise digital signs are prohibited	If you propose changeable copy, document the exception (fuel pricing, time/temp, etc.) and reference § 87.2.13.1
Placement near public ROW or on public property	County prohibits such signs without agency approval; penalties and removal possible	Confirm property boundaries and consult Public Works if the sign might be in the ROW (§ 87.2.13.7–.8)

Plain-English Summary

Humboldt County’s sign code (Article 87) restricts most signage in residential zones, allows commercial and industrial signs but with clear size, height and illumination limits, bans digital/animated signs except a few narrow exceptions, requires Master Sign Plans for large or multi-tenant sites, and requires special permits for creative or out‑of‑standard signage; always verify the parcel’s zoning and whether the County or another agency controls adjacent rights-of-way.

Source References

Humboldt County Zoning Code — Signs, § 87.2.1 et seq. (Purpose, applicability)
Humboldt County Zoning Code — Nameplates and Temporary signs, § 87.2.3 – § 87.2.5
Humboldt County Zoning Code — Appurtenant Signs and Appurtenant Sign Table, § 87.2.6 and § 87.2.6.5 (dimensional table)
Humboldt County Zoning Code — Master Sign Plan, Creative Signs, Murals: § 87.2.7 – § 87.2.9
Humboldt County Zoning Code — Illumination and Design Standards, § 87.2.12 (illumination rules including 100 cd/m² cap)
Humboldt County Zoning Code — Prohibited Signs (digital/changeable, billboards, off-premises, roof signs, signs on public property/ROW), § 87.2.13 and related billboard rules § 87.2.10
Definitions for “Sign” and “Sign, Area” (code definitions) — see code definitions (definition entries)

Sources

Retrieved passages

Humboldt County Zoning Code High relevance
Humboldt County Zoning Code High relevance
Humboldt County Zoning Code High relevance
Humboldt County Zoning Code High relevance
Humboldt County Zoning Code High relevance
Humboldt County Zoning Code (section while) High relevance
Humboldt County Zoning Code High relevance
Humboldt County Zoning Code High relevance

Cited sections

Humboldt County Zoning Code — Signs, **§ 87.2.1 et seq.** (Purpose, applicability) (§ 87.2.1)
Humboldt County Zoning Code — Nameplates and Temporary signs, **§ 87.2.3 – § 87.2.5** (§ 87.2.3)
Humboldt County Zoning Code — Appurtenant Signs and Appurtenant Sign Table, **§ 87.2.6** and **§ 87.2.6.5** (dimensional table) (§ 87.2.6)
Humboldt County Zoning Code — Master Sign Plan, Creative Signs, Murals: **§ 87.2.7 – § 87.2.9** (§ 87.2.7)
Humboldt County Zoning Code — Illumination and Design Standards, **§ 87.2.12** (illumination rules including 100 cd/m² cap) (§ 87.2.12)
Humboldt County Zoning Code — Prohibited Signs (digital/changeable, billboards, off-premises, roof signs, signs on public property/ROW), **§ 87.2.13** and related billboard rules **§ 87.2.10** (§ 87.2.13)
Definitions for “Sign” and “Sign, Area” (code definitions) — see code definitions **(definition entries)**
HumboldtCounty_ZoningCode.md

Frequently asked questions

Do I need a permit for a new business sign in unincorporated Humboldt County?

Most commercial and industrial signs are principally permitted, but permitted size, height and number limits apply; some signs (e.g., directional signs, Creative Signs, Master Sign Plans) require a Special Permit, and signs in RS/R-1/R-2 are generally prohibited without a Use Permit. See § 87.2.6 and § 87.2.11.

What are the maximum sizes for common sign types (monument, wall, freestanding)?

The Appurtenant Sign Table caps monument signs at 36 sq ft (max height 7 ft), wall signs at 2 sq ft per linear ft of facade (max 100 sq ft), and freestanding signs commonly at 64 sq ft and 18 ft tall — see § 87.2.6.5 for full details.

Can I put a digital or LED message board on my property in unincorporated Humboldt County?

No — digital, animated or changeable-copy signs are generally prohibited, except limited exceptions such as approved fuel price signs, barber poles, and time/temperature signs in commercial/industrial zones (§ 87.2.13.1).

Are murals regulated as signs?

Murals that do NOT advertise a product, service or business are principally permitted and not subject to the sign requirements. However, if the mural includes business names/logos/text it is treated as advertising and regulated as a sign (§ 87.2.8).

When is a Master Sign Plan required?

A Master Sign Plan is required for sites greater than 1 acre, sites with tenant spaces above the first floor, or any nonresidential development/building/property with 4 or more tenants; see § 87.2.7.1.

What are the sign illumination limits I must follow?

In residential zones signs must be externally illuminated and be located at least 50 ft from any residence; in nonresidential zones internal illumination is allowed unless prohibited. Nighttime luminance is limited to 100 candela per square meter, and signs must be shielded and directed to avoid light spill (§ 87.2.12).

Can I place signs in the County right-of-way or on public property?

No. Signs on public roads, rights-of-way, or public property are prohibited unless specifically permitted by the agency that controls that ROW or property (§ 87.2.13.7–.8). Confirm with Public Works for ROW authorization.

What happens if my sign is dilapidated or a traffic hazard?

Dilapidated signs may be declared a public nuisance and required to be removed. Signs that create traffic hazards (obstruct sight distance or mimic traffic signals) are prohibited and may be subject to enforcement under the nuisance and violation sections (§ 87.2.13.11 and related subsections).

Who reviews Creative Signs and how are they approved?

Creative Signs require a Special Permit and review/approval by the Zoning Administrator; they must meet General Design Standards and at least three of the Sign Features/Materials/Contextual Criteria listed in § 87.2.9. Early coordination with planning staff is recommended.

If my project is commercial and includes parking islands, do I need to worry about sign placement?

Yes — sign placement must not obstruct pedestrian/vehicle sight lines or ADA access and must respect clearance/distance-to-curb requirements listed for certain sign types; also coordinate with site parking/layout requirements in the County’s development and parking standards (see Humboldt County Parking and Humboldt County Development Standards). Verify with planning staff for parcel-specific constraints.

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