Humboldt County — Land Use

Last reviewed: July 3, 2026

Overview

This page explains how land use is regulated in the unincorporated areas of Humboldt County under the County’s zoning/regulatory code (the local zoning rules appear throughout numbered parts of the County Code: e.g., § 313‑, § 314‑, and related divisions). It covers which uses are principally permitted, which require a Use Permit or other discretionary review, and the most decision‑relevant dimensional and overlay rules you will run into when proposing a use. Verify parcel‑specific rules with County staff because combining zones and coastal versus inland rules frequently change the outcome.

(Links to related topics: zoning, development standards, parking, design review, overlay rules, ADU and state codes are embedded below where they appear in useful context. See the Source References for the controlling Code citations.)

Key rules that apply countywide (how to read the code)

• Uses are grouped into use‑type tables and “Principal Permitted Uses,” “Uses permitted with a Use Permit,” and “Uses permitted with a Special Permit.” See the use tables for each zone for the list of permitted and conditionally permitted uses (for example § 313‑7.1 for AE and § 314‑8.1 for U).
• When a use is not explicitly listed it may still be allowed if it is “similar to and compatible with” listed uses; see the Code’s use‑classification rules. Verify with the jurisdiction for borderline classifications.
• Combining zones and overlay districts (for example AP: Airport Safety Review, MR: Mineral Resources) layer additional restrictions and sometimes require supplemental findings or special notices. See the relevant combining/overlay section for each overlay.

Related topics you may need during permitting: Humboldt County Zoning, Humboldt County Development Standards, Humboldt County Parking, Humboldt County Design Review, Humboldt County Overlay Districts, and when discussing accessory units refer to state ADU law California ADU law and the California Building Standards Code.

District‑by‑district breakdown (selected, decision‑relevant districts)

Note: these descriptions apply only to unincorporated areas of Humboldt County. Always check the parcel’s actual zoning map and combining zones.

AE — Agriculture Exclusive (Code: § 313‑7.1)

• Purpose: Preserve productive agricultural lands and prevent incompatible encroachment.
• Typical Principal Permitted Uses: General agriculture (all general ag uses listed in the Code), timber production, single‑family residence, accessory dwelling units (with acreage limits), and accessory agricultural structures. See the AE permitted‑use table. § 313‑7.1.
• Common Conditionally Permitted Uses: Guest houses, farm employee housing, labor camps, second agricultural or commercial timber production residences on smaller parcels, and certain civic or industrial uses may require a Use Permit. § 313‑7.1.
• Key dimensional standards: minimum lot sizes designated AE‑20, AE‑40, AE‑60, AE‑160, AE‑600 (i.e., 20, 40, 60, 160, 600 acres minimums as applicable), front setback 20 ft (30 ft for flag lots), rear 30 ft, interior side 30 ft, exterior side 20 ft. See § 313‑7.1 for the full table of lot/yard standards.
• Where it applies: prime and designated agricultural lands in the unincorporated county; the AE designation and acreage subcategory must be checked on the zoning map. § 313‑7.1.

U — Unclassified Zone (Code: § 314‑8.1)

• Purpose: Default zone for unstudied unincorporated lands; short‑term rules to protect health and safety while more precise zoning is assigned. § 314‑8.1.
• Principal Permitted Uses: One‑family dwelling, accessory dwelling unit, general agriculture, manufactured home, rooming/boarding (limited), and limited village/tiny house provisions where General Plan land use allows. § 314‑8.1.
• Uses permitted with Use Permit or Special Permit: many village‑style or higher intensity residential arrangements (tiny house villages, dependent unit villages) and other uses not listed may require a Use Permit. § 314‑8.1.
• Dimensional standards (baseline, unless modified by combining zones or state law): minimum lot area 6,000 sq ft, minimum lot width 50 ft, front setback 20 ft, rear 10 ft, side 5 ft, max coverage 40%, minimum building separation 20 ft. § 314‑8.1.

MC — Coastal‑Dependent Industrial / MC zone (interim use rules) (see § 104.1 and cross‑references)

• Purpose: Preserve coastal‑dependent industrial lands around Humboldt Bay for uses that require navigable channel access; allow limited interim non‑coastal uses under strict standards. § 104.1.1 – 104.1.6.
• Interim/conditionally permitted uses: the Code creates an Interim Conditionally Permitted Use regime for MC lands (allowing some ML/MG uses temporarily) subject to performance standards that protect long‑term coastal industrial uses and require lease language allowing rescission/relocation. See § 104.1.1 – 104.1.4 and the Industrial Performance Standards.
• Key findings/standards: an interim use must not be detrimental to existing coastal‑dependent industrial uses; leases must include rescission/relocation clauses; industrial performance standards and coastal development rules still apply. § 104.1.3 – 104.1.5.

Selected Combining and Overlay Districts (examples)

• AP — Airport Safety Review (Code: § 16.3.1 – 16.3.4) — applies to lands designated AP on the zoning maps and imposes limits on building height, density in approach zones, and requires the Airport Safety Review Zoning Matrix to find whether a proposed use is permitted, requires a Special Permit or is not allowed. § 16.3.1 – 16.3.4.
• MR — Mineral Resources Combining Zone (Code: § 28.2) — new mining operations require a Conditional Use Permit and projects near mining sites must mitigate conflicts and provide special hearing notification and disclosure. § 28.2.1 – 28.2.5.

Special topic: Cannabis uses

• Humboldt County’s code contains an extensive commercial cannabis regime with where commercial cultivation, processing, testing and retail are allowed, and special coastal/inland distinctions. See § 313‑55.3 (dispensary rules), § 313‑55.4 (coastal commercial cannabis), and § 313‑55.5 (restrictions including prohibition on industrial hemp). Many cannabis uses require a Use Permit (or other discretionary entitlements) and must comply with public health, odor, and security conditions.

Decision‑relevant quick reference table (sample: Principal uses and where to look)

Checklist (what an applicant must satisfy for a typical non‑exempt use)

• Confirm the parcel’s zoning designation and any combining zones/overlays (verify AE/Aggregate, AP, MR, coastal overlay, etc). Verify with the jurisdiction.
• Determine whether your proposed activity is a Principal Permitted Use or requires a Use Permit/Special Permit under the zone’s table (see the zone’s § table, e.g., § 313‑7.1, § 314‑8.1).
• If in a coastal area or MC district, evaluate whether a Coastal Development Permit or interim‑use findings apply (see § 104.1).
• Confirm development standards (minimum lot size, setbacks, height, lot coverage) for the zone and for any combining zone; consult Humboldt County Development Standards.
• Check parking requirements and supply a parking plan if required; consult Humboldt County Parking.
• Identify if design review or other discretionary review applies and prepare materials accordingly; see Humboldt County Design Review.
• For ADUs and accessory housing, confirm acreage and ADU rules (some AE subcategories limit ADUs by parcel size) and reference state ADU law and local ADU rules: California ADU law.
• If proposing a cannabis use, follow the County’s cannabis sections and local coastal distinctions (see § 313‑55.x).

Risks & Ambiguities

Plain‑English Summary

Humboldt County’s zoning code lists what each unincorporated‑area zone principally allows and what activities need a discretionary Use Permit or Special Permit; agriculture, unclassified, and coastal industrial zones each come with their own permitted‑use tables and dimensional standards (for example, § 313‑7.1 for AE and § 314‑8.1 for U). Combining zones and coastal rules often change what’s allowed on a given parcel, so always verify the parcel’s precise zoning and overlays with County planning staff before assuming a use is allowed.

Source References

• Humboldt County Code: AE: Agriculture Exclusive — § 313‑7.1 (use table and development standards).
• Humboldt County Code: U: Unclassified Zone — § 314‑8.1 (principal uses; dimensional baseline).
• Interim uses in MC / coastal‑dependent industrial — § 104.1 (interim uses, findings, lease/relocation rules).
• Airport Safety Review overlay — § 16.3.1 – 16.3.4 (AP combining zone matrix and height/density rules).
• Mineral Resources Combining Zone — § 28.2 (MR combining zone: mining CUPs, notice, disclosure).
• Cannabis land‑use and dispensary rules — § 313‑55.3, § 313‑55.4, § 313‑55.5 (coastal and inland cannabis regimes, hemp prohibition).
• Use‑classification and “not specifically listed” guidance — relevant use tables and classification rules (see use tables and Section D: Use Types in the Code). See the zone tables cited above.

If you need the full raw Code text or parcel‑specific zoning map extracts, request the County Code PDF or the parcel’s zoning verification (Zoning Determination) from Humboldt County Planning — Verify with the jurisdiction.

Retrieved passages

• Humboldt County Zoning Code (Section 312-13.12.3) High relevance show source text
• Humboldt County Zoning Code (Section 314-22.1) High relevance show source text
• Humboldt County Zoning Code (Section CZ) High relevance show source text
• Humboldt County Zoning Code (Section CZ) Medium relevance show source text
• Humboldt County Zoning Code (Section 314-22.1) Medium relevance show source text
• Humboldt County Zoning Code (Section CZ) Medium relevance show source text
• Humboldt County Zoning Code (Chapter 2) Medium relevance show source text
• Humboldt County Zoning Code (Section 312-14) Medium relevance show source text

Cited sections

• Humboldt County Code: **AE: Agriculture Exclusive** — **§ 313‑7.1** (use table and development standards). (§ 313)
• Humboldt County Code: **U: Unclassified Zone** — **§ 314‑8.1** (principal uses; dimensional baseline). (§ 314)
• Interim uses in MC / coastal‑dependent industrial — **§ 104.1** (interim uses, findings, lease/relocation rules). (§ 104.1)
• Airport Safety Review overlay — **§ 16.3.1 – 16.3.4** (AP combining zone matrix and height/density rules). (§ 16.3.1)
• Mineral Resources Combining Zone — **§ 28.2** (MR combining zone: mining CUPs, notice, disclosure). (§ 28.2)
• Cannabis land‑use and dispensary rules — **§ 313‑55.3**, **§ 313‑55.4**, **§ 313‑55.5** (coastal and inland cannabis regimes, hemp prohibition). (§ 313)
• Use‑classification and “not specifically listed” guidance — relevant use tables and classification rules (see use tables and Section D: Use Types in the Code). **See the zone tables cited above**. (Section D)
• HumboldtCounty_ZoningCode.md