Rialto — Zoning

Last reviewed: July 2, 2026

Overview

Rialto's zoning rules are codified in the municipal code chapters using the 18.* numbering (the city's land-use/zoning regulations and map are implemented through the City’s municipal code). The city establishes an official Land Use Zoning Map and zone-specific regulations (use lists and dimensional standards) that control what can be built where; changes to zoning follow the city’s zone-change procedure. See the official map rules at § 18.03.010 and the land-use map rules at § 18.06.010 for the controlling authorities and map maintenance procedures.

Note: this page covers zoning only (use and dimensional rules in the Rialto code). For related topics see the city’s pages on Rialto Land Use, Rialto Development Standards, and the city’s rules on parking.

How Rialto organizes Zoning (quick map of authorities)

• Official land use zoning map is maintained by the Director of Development Services and incorporated by reference into the zoning title (§ 18.06.010) .
• The specific Rialto central area has an “official map” contained in the Central Area Specific Plan and used as the official Land Use Zoning Map for that planning area (§ 18.03.010).
• Zone boundaries, changes, and the procedure for amending zoning are in the code; the zone-change rules are in § 18.06.030.
• Design review and citywide design guidelines apply to development in most zones (§ 18.61.020).

District-by-district (purpose, typical permitted uses, key dimensional standards, where it applies)

Below are Rialto districts that appear in the zoning code. Each district header is Rialto-specific and cites the controlling section(s) from the municipal code.

A-1 (Agricultural)

• Purpose: A-1 is intended for agriculture and farm uses. § 18.08.010 sets the chapter applicability.
• Typical permitted uses: farms, orchards, nurseries and similar agricultural enterprises (§ 18.08.020).
• Key dimensional standards: minimum lot area one acre, lot width 120 ft, building height same as R-1 A and yard rules reference R-1 A standards (§ 18.08.030).
• Where it applies: see the Land Use Zoning Map maintained by the Director as the official map (§ 18.06.010).

R-1 A (Single-Family Residential)

• Purpose: R-1 A is the city’s basic single-family residential district; chapter is 18.10.
• Typical permitted uses: one permanent one-family dwelling per lot, private garages (up to three cars), customary accessory structures, home occupations subject to the home-occupation rules (§ 18.10.020).
• Key dimensional standards: front/side/rear yard and height limits are established in the chapter (see § 18.10.030–.040 for lot, yard, and height rules). Verify specific numeric setbacks and height in the chapter text.
• Where it applies: applied to lands shown on the Land Use Zoning Map; newly annexed areas default to R-1 A until mapped otherwise (§ 18.02.080).

R-1 D (Planned Medium-Density Single-Family)

• Purpose: R-1 D implements medium-density single-family subdivisions and precise-plan development (chapter 18.18).
• Typical permitted uses: detached single-family dwellings, accessory structures, home occupations, manufactured homes meeting the specific standards, supportive and transitional housing as defined in code (§ 18.18.040).
• Key dimensional standards (high decision relevance): minimum project site area 10 acres, density not to exceed net 6 units/acre, minimum lot depth 100 ft, lot width 60 ft interior / 65 ft corner, dwelling minimum 1,800 sq ft, site coverage max 50%, height max 2½ stories or 35 ft, front setback 20 ft, private garage setback 18 ft, minimum side setbacks between structures 10 ft (§ 18.18.060 and § 18.18.060.J).
• Where it applies: use-specific; projects in R-1 D require preliminary review, zone-change (if needed), tentative maps per Title 17 (subdivision law procedures), and precise plan of design approval before permits (§ 18.18.050).

C-1 (Neighborhood Commercial)

• Purpose: C-1 is intended for small, neighborhood shopping centers and uses meeting local retail needs (§ 18.28.060).
• Typical permitted uses: retail and services that serve nearby residents; some uses require precise plan/commission review; accessory uses allowed; electric vehicle charging stations referenced (§ 18.28.020 and § 18.28.060).
• Key dimensional standards: height 2½ stories / 35 ft, front yard landscaped where full block frontage is C-1 (minimum 10 ft when applicable), rear yard 15 ft, side yard rules vary where adjacent to R zones (§ 18.28.030).
• Where it applies: as shown on the Land Use Zoning Map (§ 18.06.010) and subject to design review requirements where stated.

C-2 (General Commercial)

• Purpose: C-2 allows a broader range of commercial uses and has its own lot/yard/height rules (see chapter 18.32).
• Typical permitted uses: general retail, commercial services, and commercial uses not appropriate for neighborhood C-1. Specific permitted uses are listed in the chapter text.
• Key dimensional standards: building height up to six stories or 75 ft in certain areas (with airport FAR restrictions), front yard none required (in some configurations), side/rear yards depend on adjacency to R zones (§ 18.32.030).

F-C (Freeway Commercial)

• Purpose: F-C accommodates commercial uses oriented to freeway frontage; regulations in chapter 18.33.
• Typical permitted uses: most uses allowed in R-C retail commercial plus automotive services (indoors) subject to precise plan of design; some parcels near schools have exclusions (§ 18.33.020).
• Key dimensional standards: see § 18.33.030–.060 for use and development conditions; off-street parking per Chapter 18.58.

M-1 / M-2 (Light and General Manufacturing)

• Purpose: industrial/manufacturing operations: M-1 (light industrial) and M-2 (general manufacturing) with performance and design standards (see Chapter 18.42 for M-2).
• Typical permitted uses: industrial, manufacturing, and associated accessory uses; allowed outdoor storage and truck yards are specifically managed through Chapter 18.104 and require conditional development permits in zones that allow such outdoor storage (§ 18.104.025).
• Key dimensional/use conditions: M-2 carries use conditions to control smoke, fumes, dust, odors, and other nuisances (§ 18.42.070). Off-street parking and loading must follow Chapter 18.58.

I (Interim)

• Purpose: I is an interim zoning designation for temporary control where development is pending; chapter 18.48 describes creation and limits (duration not to exceed one year unless extended) and reversion rules.

Downtown Revitalization Overlay Zone (Overlay)

• Purpose: the Downtown Revitalization Overlay Zone implements the Central Area Specific Plan and downtown design objectives (§ 18.49.010).
• Application and standards: overlay applies to downtown parcels as described in the chapter; it imposes supplemental standards and design requirements to the underlying base zone. See the overlay chapter for precise boundaries and standards.

Rialto Avenue–Cedar Avenue Corridor Commercial Overlay

• Purpose: the Rialto Avenue–Cedar Avenue corridor commercial overlay allows commercial conversion in certain M-1/M-2 properties fronting Rialto Ave or Cedar Ave with conditions and often requires a conditional development permit (§ 18.43.010–.030).

Airport Zoning (approach/height limits)

• Purpose: airport approach, transition, horizontal and conical surface limits and maps are adopted as airport zoning maps; height limits and use restrictions apply to protect navigable airspace (§ 18.50.060–.070).

Outdoor Storage / Truck Yards (special chapter)

• Purpose & Applicability: outdoor storage and truck yards are regulated in Chapter 18.104 and are allowed only in specified zones (e.g., M-1, M-2, I-GM of the Rialto Airport Specific Plan, and specific Agua Mansa industrial zones) and require conditional development permits and design controls (§ 18.104.025–.030).

Quick decision table (most decision-relevant standards / permitted uses)

How overlays, design review and special approvals work (practical guidance)

• Overlay zones (e.g., Downtown Revitalization Overlay § 18.49.010, and the Rialto Ave–Cedar Ave Corridor Overlay § 18.43.010) layer additional standards on top of base zones — always check both the underlying base zone and the overlay chapter for permit triggers and design/landscape/streetscape requirements.
• Many projects require a precise plan of design or design review; the R-1 D chapter explicitly requires preliminary review and precise plan approval before permits (§ 18.18.050). The citywide design guidelines apply to all development (§ 18.61.020) — see the Rialto design review page for procedural context.
• Off-street parking and loading are handled by Chapter 18.58 and are referenced in many zone chapters (e.g., § 18.28.050, § 18.32.050, and industrial chapters); refer to the city’s parking guidance for calculation and submittal expectations.

Checklist (what an applicant must satisfy before permits)

• Confirm the parcel’s zoning on the official Land Use Zoning Map and check overlay applicability (§ 18.06.010, § 18.03.010).
• Verify that the proposed use is listed as permitted or conditionally permitted in the applicable zone chapter (e.g., R-1 A: § 18.10.020; R-1 D: § 18.18.040).
• Confirm dimensional standards (setbacks, height, lot coverage, lot area/density) for the zone — see the specific zone chapter (e.g., § 18.18.060 for R-1 D).
• Check whether design review / precise plan is required and schedule preliminary review where applicable (§ 18.18.050, § 18.61.020).
• Calculate off-street parking and loading per Chapter 18.58 (many zone chapters refer to this) and include parking plans.
• If proposing outdoor storage or a truck yard, confirm zone eligibility and obtain Conditional Development Permit per Chapter 18.104 (§ 18.104.025).
• If zone change is required, follow the zone-change procedure and public hearing requirements (§ 18.06.030).

Risks & Ambiguities

Plain-English Summary

Rialto’s zoning code (the municipal chapters numbered 18.) puts every parcel into a zone on the official Land Use Zoning Map, lists what uses are allowed in that zone, and sets the basic rules — setbacks, heights, lot sizes, and whether design review or conditional permits are required. Start by confirming the parcel’s zone on the official map, then read the specific zone chapter for permitted uses and the dimensional rules you'll have to meet; if anything is unclear, the planning commission can resolve zone-boundary and use-determination questions (**§ 18.06.010*, § 18.03.010).

Source References

• Official Land Use Zoning Map and map rules — § 18.06.010.
• Official map (Central Area Specific Plan) — § 18.03.010.
• R-1 A rules and permitted uses — § 18.10.020.
• R-1 D permitted uses, review process, and development standards — § 18.18.040, § 18.18.050, § 18.18.060.
• C-1 and C-2 standards — § 18.28.030, § 18.32.030.
• F-C (Freeway Commercial) — § 18.33.010–.020.
• M-2 and industrial use conditions — § 18.42.070.
• Overlays: Rialto Ave–Cedar Ave Corridor Overlay — § 18.43.010–.030; Downtown Revitalization Overlay — § 18.49.010.
• Airport zoning (approach/height/use restrictions) — § 18.50.060–.070.
• Outdoor storage & truck yards (special permitting and zones) — Chapter 18.104 / § 18.104.025–.030.
• Design Guidelines applicability — § 18.61.020.

Information not found in retrieved materials or that requires parcel-specific verification:

• Specific municipal code section text for accessory dwelling units (ADUs) and the full ADU compliance checklist: Not found in retrieved materials — verify with the planning division or the city's ADU chapter/page. See the city's ADU resource at Rialto ADUs.
• Exact numeric front/side/rear yard numbers for some R zones beyond the examples above: where not explicitly quoted in the extracts above, verify in the full zone chapter text. Verify with the jurisdiction for parcel‑specific questions.

Retrieved passages

• Rialto Zoning Code (Chapter IV) High relevance show source text
• Rialto Zoning Code (Section 18.06.030) High relevance show source text
• Rialto Zoning Code (§ 1) High relevance show source text
• Rialto Zoning Code (§ 3) High relevance show source text
• Rialto Zoning Code (Chapter 18.68) High relevance show source text
• Rialto Zoning Code (Title XII) Medium relevance show source text
• Rialto Zoning Code (§ 4) Medium relevance show source text
• Rialto Zoning Code (Chapter 18.66) Medium relevance show source text

Cited sections

• Official Land Use Zoning Map and map rules — **§ 18.06.010**. (§ 18.06.010)
• Official map (Central Area Specific Plan) — **§ 18.03.010**. (§ 18.03.010)
• R-1 A rules and permitted uses — **§ 18.10.020**. (§ 18.10.020)
• R-1 D permitted uses, review process, and development standards — **§ 18.18.040**, **§ 18.18.050**, **§ 18.18.060**. (§ 18.18.040)
• C-1 and C-2 standards — **§ 18.28.030**, **§ 18.32.030**. (§ 18.28.030)
• F-C (Freeway Commercial) — **§ 18.33.010–.020**. (§ 18.33.010)
• M-2 and industrial use conditions — **§ 18.42.070**. (§ 18.42.070)
• Overlays: Rialto Ave–Cedar Ave Corridor Overlay — **§ 18.43.010–.030**; Downtown Revitalization Overlay — **§ 18.49.010**. (§ 18.43.010)
• Airport zoning (approach/height/use restrictions) — **§ 18.50.060–.070**. (§ 18.50.060)
• Outdoor storage & truck yards (special permitting and zones) — **Chapter 18.104 / § 18.104.025–.030**. (Chapter 18.104)
• Design Guidelines applicability — **§ 18.61.020**. (§ 18.61.020)
• Specific municipal code section text for accessory dwelling units (ADUs) and the full ADU compliance checklist: Not found in retrieved materials — verify with the planning division or the city's ADU chapter/page. See the city's ADU resource at Rialto ADUs. (section text)
• Exact numeric front/side/rear yard numbers for some R zones beyond the examples above: where not explicitly quoted in the extracts above, verify in the full zone chapter text. Verify with the jurisdiction for parcel‑specific questions. (chapter text.)
• Rialto_ZoningCode.md

• Official Rialto code library