Siskiyou County — Signage

Last reviewed: July 6, 2026

Overview

In unincorporated areas, Siskiyou County regulates signs through Title 10, Article 58 of the County Code, with content-neutral rules that emphasize the county’s rural, scenic character and traffic safety. Commercial messages are generally limited to on-site advertising, with a narrow Highway Commercial exception; noncommercial messages are allowed on any sign type permitted by the code. See the county’s broader Siskiyou County Zoning framework to confirm your base district before applying the sign standards below. The most common cross-issues are setbacks and frontage under Siskiyou County Development Standards, potential design review triggers, and visibility/parking safety under Siskiyou County Parking.

Most signs are allowed only for on-site advertising; off-site commercial advertising is allowed only in the Highway Commercial (C-H) district, and any permitted sign may carry a noncommercial message instead of a commercial one. See § 10-6.5811, § 10-6.5813, and § 10-6.5802.

Countywide rules that apply in all unincorporated areas

• Purpose and policy: The sign article is intended to protect scenic views, reduce distractions, and enhance tourism while allowing both commercial and noncommercial speech. See § 10-6.5801.
• Noncommercial messages: Any permitted sign may display a noncommercial message in lieu of any other message. See § 10-6.5802.
• Permit requirement: A sign permit is required unless the code specifically exempts that sign type; the Planning Director acts within 10 days on a complete application. See § 10-6.5818.
• Size and height caps (countywide):
  • Maximum sign area: 150 sq ft; near I‑5 interchanges, certain commercial/industrial signs can go up to 200 sq ft with findings (traveler services, safety, scenic-freeway check, no obscuring). See § 10-6.5804.
  • Maximum height: 30 ft; near I‑5 interchanges, certain signs may exceed height with findings (freeway visibility, safety). See § 10-6.5806 and § 10-6.5805.
• Illumination and animation:
  • Illumination allowed if light source is not visible beyond the display face. See § 10-6.5823.
  • Flashing/animated signs are prohibited; only time/temperature displays are excepted. See § 10-6.5824.
• Placement and setbacks:
  • Signs may not encroach into required yards; construction must comply with County Building Regulations (Title 9). See § 10-6.5825.
  • County development standards also recognize that signs permitted by Article 58 may deviate from the required front yard setback when a sign permit explicitly allows it (practical siting relief). See development standards footnote allowing deviation and billboard height note.
• Public property: Only limited temporary, noncommercial postings on lamp/utility poles are allowed (size and duration limits). See § 10-6.5816(a).
• Cumulative: Allowed sign types are cumulative within a district. See § 10-6.5817.
• Approvals and appeals: Denials by the Planning Director may be appealed to the Planning Commission, then to the Board of Supervisors; permits expire after two years if not installed. See §§ 10-6.5819–5822.

Common sign types and baseline standards (unincorporated areas)

Notes:

• Commercial on-site limitation does not apply to noncommercial messages; those may be off-site. See § 10-6.5802 and § 10-6.5811.
• The I‑5 interchange exception applies within 1,500 ft of an interchange, subject to scenic-freeway, traveler-services, safety, and non-obscuring findings. See §§ 10-6.5804–5806.

District-by-district guidance (how signage fits your base zone)

Confirm your base zoning on the County map, then apply the sign allowances below. For broader land-use context, see Siskiyou County Land Use and Siskiyou County Overlay Districts.

C-R — Rural Neighborhood Commercial

• Purpose/uses: Less‑intensive commercial near neighborhoods (small retail, offices, services). See § 10-6.4101 and § 10-6.4102.
• Signs you can expect:
  • On‑site business signs per § 10-6.5811 (freestanding/window/wall/projecting); each freestanding/window sign ≤48 sq ft; wall ≤10% of wall area or 100 sq ft.
  • Billboards allowed (≤150 sq ft; ≤30 ft; one per lot); no off-site commercial ads in C‑R. See § 10-6.5813.
• Dimensional interplay: Signs may deviate from front-yard setback if explicitly permitted on the sign permit; otherwise no yard encroachment. Development standard footnote; § 10-6.5825.

C-U — Neighborhood Commercial

• Purpose/uses: Less‑intensive commercial compatible with neighborhoods (includes service stations, offices, convenience retail). See § 10-6.4201–4202.
• Signs: Same as C‑R for on‑site business signs and billboards, with off-site commercial ads prohibited (noncommercial okay). See § 10-6.5811 and § 10-6.5813.
• Setbacks/visibility: Apply development standards and parking safety clearances; consider Siskiyou County Parking. Footnote and § 10-6.5825.

C-C — Town Center

• Purpose/uses: Mixed commercial core serving town centers and rural communities (retail, services, multi-family, civic). See § 10-6.4301–4303.
• Signs: On‑site business signs per § 10-6.5811; billboards allowed but off-site commercial advertising not allowed in C‑C. See § 10-6.5813.
• Design fit: Expect greater emphasis on aesthetics and pedestrian clearances; check if your project triggers Siskiyou County Design Review.

C-H — Highway Commercial

• Purpose/uses: Highway traveler services clustered at community nodes or selected points; focus on safe access and maneuvering. See § 10-6.4401–4402.
• Signs:
  • On‑site business signs per § 10-6.5811.
  • Billboards allowed; this is the only district that allows off‑site commercial advertising on billboards. One billboard per lot; billboard ≤150 sq ft and ≤30 ft. See § 10-6.5813 and billboard definition.
  • Near I‑5 interchanges: Larger/taller signs may be approved with findings (traveler‑service nexus; scenic‑freeway check). See §§ 10-6.5804–5806.

M-L — Limited Industrial

• Purpose/uses: Clean, non‑nuisance industrial uses in an industrial park setting (assembly, labs, storage, trade schools). See § 10-6.4501–4503.
• Signs: On‑site business signs per § 10-6.5811; billboards allowed but off‑site commercial ads not allowed (noncommercial okay). See § 10-6.5813.

M-M — Light Industrial

• Purpose/uses: Not found in retrieved materials.
• Signs: On‑site business signs per § 10-6.5811; billboards allowed but off‑site commercial ads not allowed (noncommercial okay). See § 10-6.5813.

M-H — Heavy Industrial

• Purpose/uses: Accommodates most industrial operations, with added controls for higher-impact uses. See § 10-6.4701–4703.
• Signs: On‑site business signs per § 10-6.5811; billboards allowed but off‑site commercial ads not allowed (noncommercial okay). See § 10-6.5813.

Residential districts (Res‑1 through Res‑4)

• Purpose/uses: Residential neighborhoods (see district articles under Title 10).
• Signs: One residential identification sign per residence (≤2 sq ft; ≤3 ft height for pole/monument), plus general temporary signs (yard sale, political) subject to size/duration limits. See § 10-6.5808 and § 10-6.5812.

Rural Residential Agricultural (R-R), Agricultural (AG‑1/AG‑2), and TPZ

• Purpose/uses: Low-density residential with agriculture (R‑R), general agriculture (AG‑2), prime agriculture (AG‑1), and timber production (TPZ). AG‑2 purpose at § 10-6.4901; others not retrieved.
• Signs: Agricultural produce sale signs are allowed by right in all districts (two per frontage; each face ≤20 sq ft; on‑site products only). Other sign types follow the same countywide rules (illumination, no flashing/animation, no yard encroachment unless permitted). See §§ 10-6.5810; 10-6.5823–5825.

Practical tips

• Scenic-highway check: The I‑5 interchange exceptions cannot be used in designated scenic-freeway areas; confirm in the General Plan before designing highway-visible signs. See findings lists in §§ 10-6.5804–5806; 10-6.5811(a)(3).
• Multi-tenant walls: The wall-sign cap is the lesser of 10% of the wall area or 100 sq ft, which can constrain multi-tenant facades; plan shared sign strategies early. See § 10-6.5811(d).
• Construction/electrical: The zoning code requires compliance with County Building Regulations (Title 9); for statewide construction and electrical standards, see the California Building Standards Code. See § 10-6.5825.

Checklist

• Confirm the parcel is in the unincorporated county (not an incorporated city) via Siskiyou County zoning & planning overview.
• Identify your base zoning district and any overlay districts.
• Select the allowed sign category for your district (e.g., on-site business sign under § 10-6.5811, billboard under § 10-6.5813, or a by-right ID/temporary/ag-produce sign).
• Check countywide caps (area ≤150 sq ft; height ≤30 ft) and whether I‑5 interchange findings might apply. §§ 10-6.5804–5806.
• Site the sign outside required yards unless your sign permit expressly authorizes a front-yard deviation; verify sight-distance/parking safety. § 10-6.5825; dev standards footnote.
• Confirm illumination is shielded and no flashing/animation (time/temperature only). §§ 10-6.5823–5824.
• Prepare permit submittal: application form, scaled sign drawing with dimensions, site/plot plan, photos, and owner authorization. § 10-6.5818(b)–(c).
• Track deadlines: Planning Director action in 10 days; appeal windows; permit expires if not installed within 2 years. §§ 10-6.5818(d); 10-6.5819–5822.

Risks & Ambiguities

Plain-English Summary

If your property is in unincorporated Siskiyou County, most business signs are allowed with a quick County sign permit, but they must be on-site, meet size/height caps, avoid flashing/animation, and be placed outside required yards unless your permit says otherwise. Only Highway Commercial sites can run off-site billboard ads, and special I‑5 interchange findings are needed for any extra-tall or oversized signs. See §§ 10-6.5811; 10-6.5813; 10-6.5804–5806; 10-6.5823–5825.

Source References

• Siskiyou County Code, Title 10, Article 58 (Sign Regulation): §§ 10-6.5801–5825 (purpose, noncommercial messages, definitions, size/height caps, permit process, sign types, illumination/animation, other laws).
• Commercial/industrial signs: § 10-6.5811.
• Residential and nonresidential ID signs: §§ 10-6.5808–5809.
• Agricultural produce sale signs: § 10-6.5810.
• Billboards and off-site commercial limitation to C‑H: § 10-6.5813; billboard size/height in definitions; billboard height note in development standards.
• Appeals and permit duration: §§ 10-6.5819–5822.
• C‑R, C‑U, C‑C, C‑H, M‑L, M‑H district purposes/uses: §§ 10-6.4101–4103; 10-6.4201–4203; 10-6.4301–4303; 10-6.4401–4402; 10-6.4501–4503; 10-6.4701–4703.
• Cross-references to development standards/yard notes: Development Standards footnote and lighting standard.
• For statewide construction/electrical, see California Building Standards Code.

Retrieved passages

• Siskiyou County Zoning Code (§ 3) High relevance show source text
• Siskiyou County Zoning Code (section 10-6.5501) High relevance show source text
• Siskiyou County Zoning Code (§ 3) High relevance show source text
• Siskiyou County Zoning Code (article to) High relevance show source text
• Siskiyou County Zoning Code (Section 10-6.5806) High relevance show source text
• Siskiyou County Zoning Code (Article 58.) High relevance show source text
• Siskiyou County Zoning Code (§ I) High relevance show source text
• Siskiyou County Zoning Code (§ 3) High relevance show source text
• Siskiyou County Zoning Code (article to) High relevance show source text
• Siskiyou County Zoning Code (§ 3) Medium relevance show source text
• Siskiyou County Zoning Code (§ 3) Medium relevance show source text
• Siskiyou County Zoning Code (article provided) Medium relevance show source text
• Siskiyou County Zoning Code Medium relevance show source text
• Siskiyou County Zoning Code (§ 2.1) Medium relevance show source text
• CBC § 11B (Section 11B-202.4) Medium relevance show source text
• Siskiyou County Zoning Code (Article 13) Medium relevance show source text
• Siskiyou County Zoning Code (§ 3) High relevance show source text
• Siskiyou County Zoning Code (Article 58) Medium relevance show source text
• Siskiyou County Zoning Code (Article 3.) Medium relevance show source text
• Siskiyou County Zoning Code (TITLE 10.) Medium relevance show source text

Cited sections

• Siskiyou County Code, Title 10, Article 58 (Sign Regulation): **§§ 10-6.5801–5825** (purpose, noncommercial messages, definitions, size/height caps, permit process, sign types, illumination/animation, other laws). (Title 10)
• Commercial/industrial signs: **§ 10-6.5811**. (§ 10-6.5811)
• Residential and nonresidential ID signs: **§§ 10-6.5808–5809**. (§ 10-6.5808)
• Agricultural produce sale signs: **§ 10-6.5810**. (§ 10-6.5810)
• Billboards and off-site commercial limitation to C‑H: **§ 10-6.5813**; billboard size/height in definitions; billboard height note in development standards. (§ 10-6.5813)
• Appeals and permit duration: **§§ 10-6.5819–5822**. (§ 10-6.5819)
• C‑R, C‑U, C‑C, C‑H, M‑L, M‑H district purposes/uses: **§§ 10-6.4101–4103; 10-6.4201–4203; 10-6.4301–4303; 10-6.4401–4402; 10-6.4501–4503; 10-6.4701–4703**. (§ 10-6.4101)
• Cross-references to development standards/yard notes: Development Standards footnote and lighting standard.
• For statewide construction/electrical, see California Building Standards Code.
• SiskiyouCounty_ZoningCode.md

• Official Siskiyou County code library