Local zoning · Humboldt County

Humboldt County — Zoning

Q: What can I build on an R‑1 lot in Humboldt County?

In unincorporated Humboldt County an R‑1 lot principally allows single‑family residential uses listed in § 314‑6.2 ; accessory uses permitted by that section and county accessory‑use rules may also apply. Numeric setbacks and development standards are not fully reproduced in the retrieved text and must be verified via the County’s Development Standards or Planning Division. (See § 314‑6.2)

Q: Are there special rules if my property is near the airport?

Yes. The AP — Airport Safety Review Zone imposes height limits, may require special permits for structures over 35 ft , and can limit residential density in approach zones to 1 dwelling per 3 acres unless a Special Permit is granted ( § 16.3.4.2 — § 16.3.4.3.1 ). Check whether your parcel is mapped in the AP overlay.

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

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Last reviewed: July 3, 2026

Overview

Humboldt County’s zoning (the County’s Title 17 / zoning chapters as reproduced in the supplied materials) regulates land use and development only in the unincorporated areas of the county. The code lists principal zone districts (commercial, industrial, residential, resource, public and special-purpose districts), combining/overlay zones (airport safety, mineral resources, Samoa Town Master Plan, etc.), and use-specific controls (for example cannabis and industrial hemp rules). For rules about measurements and site-level standards consult the County’s published development standards and the specific zone text; see the County’s Development Standards and Parking pages for related technical criteria. The principal zones and their controlling code sections are listed in the code (e.g. C‑1: § 314‑2.1) .

District-by-district breakdown (unincorporated Humboldt County)

Note: each subsection below gives the statutory purpose and typical permitted uses from the zoning code and cites the controlling code section. Where the ordinance text in the retrieved materials does not provide numeric dimensional standards (setbacks, heights, lot coverage, FAR), that numeric detail is noted as Not found in retrieved materials — verify with the Planning Division or the County’s Development Standards. All citations below reference the County ordinance excerpts retrieved.

C-1 — Neighborhood Commercial

Purpose: Provide small-scale shopping and services that serve nearby residential areas without undermining residential character. (Purpose: § 314‑2.1)
Typical permitted uses: social halls, professional and business offices, commercial instruction (principal permitted uses listed in § 314‑2.1) .
Key dimensional standards: numeric setbacks/height/coverage — Not found in retrieved materials (see County Development Standards).
Where it applies: parcels shown as C‑1 on the adopted zoning maps; applies only in unincorporated areas per the principal zones mapping rules § 1.1 and the principal zone table § 314 series .

C-2 — Community Commercial

Purpose and uses: broader commercial uses serving larger catchments; see § 314‑2.2 for the list of permitted uses. (See § 314‑2.2) .
Key dimensional standards: Not found in retrieved materials; verify via Development Standards.
Where it applies: shown on County zoning map as C‑2 .

C-3 — Industrial Commercial

Purpose and uses: heavier commercial uses and commercial uses with some industrial character; see § 314‑2.3. (See § 314‑2.3) .
Key dimensional standards: Not found in retrieved materials.

CH — Highway Service Commercial

Purpose/uses: highway-oriented retail and services; see § 314‑2.4. (See § 314‑2.4) .

MB — Business Park

Purpose/uses: business park and office/industrial campus-style uses; see § 314‑3.1. (See § 314‑3.1) .

ML — Limited Industrial

Purpose/uses: limited industrial/light manufacturing; see § 314‑3.2. (See § 314‑3.2) .

MH — Heavy Industrial

Purpose/uses: heavier industrial operations; see § 314‑3.3. (See § 314‑3.3) .

AV — Airport

Purpose: protect airport operations and safety; see the Airport Safety Review Zone provisions for applicability and the Airport Safety Review Matrix (§ 16.3.1 — § 16.3.4). Buildings above 35 ft require a special permit in some airport areas (§ 16.3.4.2); maximum densities in approach zones are limited to 1 unit per 3 acres absent a special permit (§ 16.3.4.3.1) .

PF1 — Public Facility (Urban)

Purpose/uses: public facilities and governmental uses; see § 314‑4.2. (See § 314‑4.2) .

DF — Design Floodway and FP — Flood Plain

Purpose: flood hazard land use categories. See § 314‑5.1 (DF) and § 314‑5.2 (FP) for mapping and special limitations. (See § 314‑5.1 — § 314‑5.2) .

RS — Residential Suburban

Purpose/uses: lower-density suburban residential; see § 314‑6.1. (See § 314‑6.1) .

R-1 — Residential One‑Family

Purpose/uses: single‑family residential neighborhoods; principal permitted uses are listed in § 314‑6.2. (See § 314‑6.2) .
ADUs: state ADU rules interact with local zoning; consult California ADU law for state-mandated ADU allowances and check local implementing rules (verify with County) .

R-2 — Residential Two‑Family

Purpose/uses: duplexes and similar two-unit residential types; § 314‑6.3. (See § 314‑6.3) .

R-3 — Residential Multiple Family

Purpose/uses: multiunit residential; § 314‑6.4. (See § 314‑6.4) .

R-4 — Apartment Professional

Purpose/uses: mixed residential/professional apartment settings; § 314‑6.5. (See § 314‑6.5) .

RA — Rural Residential Agricultural

Purpose/uses: rural residential with agricultural accessory uses; § 314‑6.6. (See § 314‑6.6) .

AE — Agriculture Exclusive and AG — Agriculture General

Purpose: protect agricultural lands. AE is the more restrictive agriculture-exclusive district (§ 314‑7.1); AG permits broader farm activities (§ 314‑7.2). (See § 314‑7.1 — § 314‑7.2) .

FR — Forestry‑Recreation and TPZ — Timberland Production Zone

Purpose/uses: resource extraction, forestry, and timber production land uses. FR and TPZ rules are in § 314‑7.3 and § 314‑7.4, including references to special standards such as cottage industry allowances and TPZ-specific limitations (see § 45.1 and § 45.1.5 for cottage industry in resource zones) .

U — Unclassified

Purpose: parcels not classified within other principal zones; see § 314‑8.1. (See § 314‑8.1) .

Selected overlays, combining zones, and use‑specific rules

Airport Safety Review Zone (AP): applies to lands near airports; contains a matrix of permitted uses when combined with principal zones, building height limits, and density limits in approach zones (see § 16.3.1—§ 16.3.4, including § 16.3.4.2 and § 16.3.4.3.1) .
Samoa Town Master Plan (STMP) Overlay: special combining zone with precedence over most other regulations where mapped; requires parcel mergers and map recordation for certain zone changes (see § 34.5.2—§ 34.5.3) .
Mineral Resources (MR) / Surface Mining (SMARA): combining zone sets special hearing notice, mitigation and disclosure requirements for projects near mining operations (see § 28.2.3—§ 28.2.5) .
Cannabis — Coastal Commercial Cannabis Land Use Ordinance (CCCLUO): regulates where and how commercial cannabis activities are allowed in the Coastal Zone; identifies permissible zones, required permits, and special setback and resource-protection requirements (see § 55.4.1—§ 55.4.4 and related subsections) .
Industrial Hemp: cultivation and registration of industrial hemp are expressly prohibited in all unincorporated county zoning districts (see § 55.5.4.1 — “cultivation of industrial hemp … is expressly prohibited in all zoning districts in the unincorporated area of the County”) .

For a fuller list of combining and special-area zones see the Special Area Combining Zone provisions § 15.2 (applicability and precedence) , and the County’s Overlay Districts page for guidance.

Key decision‑relevant reference table

District / Topic	What matters most to applicants	Quick rule or summary	Code Reference
C‑1 (Neighborhood Commercial)	Whether your proposed retail/service use is a permitted “neighborhood” use	Principal permitted uses listed; compatibility emphasis	§ 314‑2.1
C‑2 (Community Commercial)	Larger footprint retail, community services	Permitted uses listed for community commercial	§ 314‑2.2
ML (Limited Industrial)	Allowed industrial uses, buffers to residential	Light industry permitted; see ML use list	§ 314‑3.2
R‑1 (One‑Family Residential)	Single‑family uses and whether accessory uses allowed	Principal uses listed; ADU allowances subject to state law and local implementation (verify)	§ 314‑6.2
AE / AG (Agriculture)	Farm operations and accessory residential uses	AE most restrictive; AG broader agriculture uses	§ 314‑7.1 — § 314‑7.2
TPZ (Timberland Production)	Timber production rules, cottage industries	TPZ rules and cottage industry limits apply; cottage industry allowed with standards § 45.1.5	§ 314‑7.4; cottage industry § 45.1.5
AP (Airport Safety Review)	Height and density limits in approach/clear zones	Buildings >35 ft may need a Special Permit; max density 1 du/3 acres in approach zones unless SP	§ 16.3.4.2 — § 16.3.4.3.1
Industrial Hemp	Whether hemp cultivation is allowed	Cultivation and registrations expressly prohibited in all unincorporated zoning districts	§ 55.5.4.1
Cannabis (Coastal)	Whether commercial cannabis is allowed on a parcel in the Coastal Zone	Detailed permit and setback rules; allowed only where expressly permitted in the zoning matrix	§ 55.4.1 — § 55.4.4

Checklist — what an applicant must satisfy (typical, unincorporated Humboldt County)

Confirm your parcel’s principal zone designation on the County zoning map and the controlling code section (e.g., § 314‑6.2 for R‑1) .
Confirm any combining/overlay zones that apply (airport, STMP, MR, coastal overlay) and their precedence § 15.2; these may add or supersede standards .
Determine whether the use is listed as a principal permitted use, conditional use, or prohibited in the applicable zone (see the § 314‑2 through § 314‑8 tables for principal zones) .
If the parcel is in or near regulated resources, school stops, or tribal cultural sites, check specific setbacks and special permit triggers (e.g., cannabis coastal setbacks § 55.4.6.4.4 where applicable) .
For airport‑area projects, verify height and density limits in the AP overlay (§ 16.3.4) .
Prepare submissions that meet County development standards (landscaping, screening, and parking requirements) and any required findings in Chapter 2 permit provisions (see § 312‑17 for findings referenced in permit decisions) .
If proposing ADUs, reconcile local zoning with statewide ADU rules; see the state guidance on California ADU law and confirm local implementation .
If your proposed activity is cannabis‑related, complete the zoning clearance/certification or special permit required by the CCCLUO (§ 55.4.3.11 — § 55.4.3.12) before obtaining building or grading permits .

Risks & Ambiguities

Issue	Why it matters	What to verify
Missing numeric setbacks/heights/coverage in retrieved text	Many zone summaries in the materials list uses but not the numeric dimensional standards required for plan compliance	Confirm the numeric setbacks, lot coverage, height limits and floor‑area ratios with the County’s Development Standards and the specific zone section on the County site (verify with Planning) (Not found in retrieved materials)
Parcel‑specific overlays (STMP, AP, MR)	Overlays can supersede or add restrictions (e.g., Samoa STMP merger requirement)	Check the parcel on the County’s zoning map and overlay map; read § 34.5.2 for STMP preconditions and § 16.3.2 for AP applicability
Coastal vs. inland zoning differences	Coastal zone sections (e.g., cannabis in the Coastal Zone) carry additional LCP and Coastal Act constraints	If parcel is in the Coastal Zone, read the CCCLUO § 55.4 series for coastal-specific rules and coastal permitting requirements
State law preemption (ADUs, housing laws)	State ADU and housing laws limit some local restrictions	Verify local implementing ordinances against California ADU law and California housing laws (local code excerpts do not override state mandates)
Use lists vs. real‑world interpretation	The code lists many permitted and conditionally permitted uses, but classification can be unclear (e.g., is a new use “commercial” or “industrial”?)	Ask the Planning Division for use classification/interpretation and whether a Use Permit is required; see Development Permit Procedures in Chapter 2 § 312‑17 for findings
Zoning map currency and parcel history	Ordinance text doesn’t in itself show which parcels currently carry which zone	Verify current map/date and zoning for the APN with County Planning (zoning maps and GIS) — parcel-specific confirmation required (Verify with the jurisdiction)

Plain‑English Summary

Humboldt County’s zoning code divides the unincorporated county into named zoning districts (residential, commercial, industrial, resource and special) with lists of permitted, conditionally permitted, and prohibited uses; overlays (airport, Samoa STMP, mining, coastal rules) add or change requirements for specific places. Most use permissions are found in the § 314 zone listings, and several topic‑specific rules (cannabis, hemp, airport safety) appear in later sections (e.g., § 55.4, § 55.5, § 16.3). Numeric dimensional rules (exact setbacks, lot coverage, and heights) should be checked in the County’s Development Standards or verified with Planning because they are not fully reproduced in the materials provided here .

Source References

Principal zone listings and individual zone sections (principal zones table and § 314 series) — example: § 314‑2.1, § 314‑6.2 .
C‑1 zone details: § 314‑2.1 (Neighborhood Commercial) .
Airport Safety Review Zone: § 16.3.1 — § 16.3.4 (including § 16.3.4.2 & § 16.3.4.3.1) .
Samoa Town Master Plan Overlay: § 34.5.2 — § 34.5.3 .
Coastal Commercial Cannabis Land Use Ordinance (CCCLUO): § 55.4.1 — § 55.4.4 and many related subsections on setbacks and permitting (coastal cannabis rules) .
Industrial hemp prohibition: § 55.5.4.1 (cultivation prohibited in all unincorporated zoning districts) .
Cottage industry rules and resource-zone allowances: § 45.1 and § 45.1.5 (applicability and standards) .
Permit findings and permit-related references: Chapter 2 permit references and § 312‑17 (findings) as cited in permit sections (see relevant permit decision text) .
For statewide ADU and building standards consultation: California ADU law and California Building Standards Code.

Sources

Retrieved passages

CBC § 313 (Section 313-55.4.5.1.5) High relevance
Humboldt County Zoning Code (§ 4) Medium relevance
Humboldt County Zoning Code (Section CZ) Medium relevance
Humboldt County Zoning Code Medium relevance
Humboldt County Zoning Code (Section 312-14) Medium relevance
Humboldt County Zoning Code (section is) Medium relevance
Humboldt County Zoning Code (Chapter of) Medium relevance
Humboldt County Zoning Code (§ 1) Medium relevance

Cited sections

Principal zone listings and individual zone sections (principal zones table and § 314 series) — example: **§ 314‑2.1**, **§ 314‑6.2** . (§ 314)
C‑1 zone details: **§ 314‑2.1** (Neighborhood Commercial) . (§ 314)
Airport Safety Review Zone: **§ 16.3.1 — § 16.3.4** (including **§ 16.3.4.2** & **§ 16.3.4.3.1**) . (§ 16.3.1)
Samoa Town Master Plan Overlay: **§ 34.5.2 — § 34.5.3** . (§ 34.5.2)
Coastal Commercial Cannabis Land Use Ordinance (CCCLUO): **§ 55.4.1 — § 55.4.4** and many related subsections on setbacks and permitting **(coastal cannabis rules)** . (§ 55.4.1)
Industrial hemp prohibition: **§ 55.5.4.1** (cultivation prohibited in all unincorporated zoning districts) . (§ 55.5.4.1)
Cottage industry rules and resource-zone allowances: **§ 45.1** and **§ 45.1.5** (applicability and standards) . (§ 45.1)
Permit findings and permit-related references: Chapter 2 permit references and **§ 312‑17** (findings) as cited in permit sections (see relevant permit decision text) . (Chapter 2)
For statewide ADU and building standards consultation: California ADU law and California Building Standards Code.
HumboldtCounty_ZoningCode.md
2025 California ADU handbook.md

Frequently asked questions

What can I build on an R‑1 lot in Humboldt County?

In unincorporated Humboldt County an R‑1 lot principally allows single‑family residential uses listed in § 314‑6.2; accessory uses permitted by that section and county accessory‑use rules may also apply. Numeric setbacks and development standards are not fully reproduced in the retrieved text and must be verified via the County’s Development Standards or Planning Division. (See § 314‑6.2)

What are Humboldt County setback requirements?

The retrieved zoning excerpts list permitted uses and zone purposes but do not consistently publish universal numeric setbacks for every district in the excerpts provided. Numeric setbacks, lot coverage and height standards are in the County’s development standards and specific zone subsections — verify with the County (Not found in retrieved materials).

Do I need a Use Permit or can the County approve my project ministerially?

Whether a project is ministerial or discretionary depends on the use classification in the applicable zone and any overlays. The county’s Development Permit Procedures (Chapter 2 references and findings such as § 312‑17) govern when discretionary findings and hearings are required. For coastal commercial cannabis, for example, a zoning clearance/special permit is required before building permits (see § 55.4.3.11 — § 55.4.3.12) .

Are there special rules if my property is near the airport?

Yes. The AP — Airport Safety Review Zone imposes height limits, may require special permits for structures over 35 ft, and can limit residential density in approach zones to 1 dwelling per 3 acres unless a Special Permit is granted (§ 16.3.4.2 — § 16.3.4.3.1). Check whether your parcel is mapped in the AP overlay.

Can I cultivate industrial hemp on my rural parcel?

No. The County’s ordinance expressly prohibits cultivation of industrial hemp in all zoning districts in the unincorporated area — § 55.5.4.1 states that cultivation and registration of industrial hemp are prohibited.

What special rules apply to commercial cannabis in the Coastal Zone?

Commercial cannabis in the Coastal Zone is regulated by the Coastal Commercial Cannabis Land Use Ordinance. It limits where cannabis cultivation, processing, testing, and sales can occur, prescribes which zones may allow those uses, and requires the applicable zoning approvals prior to building or grading permits (see § 55.4.1 — § 55.4.4 and related subsections on setbacks and permit types)

How do overlay zones (like Samoa STMP) affect permitted uses?

Overlay/combining zones can add standards or supersede primary zone rules. The Samoa Town Master Plan overlay specifically requires parcel mergers and may change or postpone the effectiveness of land use designations until its conditions are met (see § 34.5.2 — § 34.5.3). When a conflict exists, the overlay rules can take precedence for the mapped area.

Where are parking requirements specified for zoning approvals?

Parking rules are part of the County’s development standards; the zoning code refers to parking obligations and to compliance with technical development standards. Consult the County Parking page and the Development Standards for the exact numeric parking rates and design rules (Not fully reproduced in the retrieved zoning excerpts).

If my parcel is in the Coastal Zone, do I also need a Coastal Development Permit?

Coastal Zone parcels are subject to the County’s Coastal Zoning regulations for specific uses (for example cannabis in § 55.4). Many coastal projects require a Coastal Development Permit in addition to local zoning permits — check the CCCLUO and local LCP provisions and consult Planning for parcel‑specific requirements (see § 55.4 series)

How do I find whether an overlay applies to my APN?

The zoning map and the County’s GIS/Planning records show overlays such as AP, MR, STMP. The zoning code describes overlay applicability (e.g., § 15.2 for combining zones) but does not replace parcel‑specific map checks — verify with the County’s Planning Division

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