Outdoor Lighting in Modesto, CA: What Residents Actually Need to Know

If you live in Modesto or are thinking about moving there, outdoor lighting are one of those things you probably won't think about until they affect you directly. Modesto has 2 specific rules on the books covering different aspects of outdoor lighting, and some of them might surprise you.

Billboard Lighting

Modesto limits electronic message boards, video display signs, and digital freeway billboards along Highway 99 to a brightness of three-tenths of a foot candle above ambient light, measured with a Lux meter under Municipal Code Section 10-6.108(f)(1)(ii)(j). Every covered sign must run automatic dimming technology and revert to a black screen immediately if it malfunctions or exceeds the cap.

Key details: Brightness cap: 0.3 foot candles above ambient light. Measurement device: Foot candle (Lux) meter aimed at sign face. Ambient reading window: 30 min after sunset to 30 min before sunrise. Malfunction default: Automatic revert to black screen. Governing section: Modesto Code § 10-6.108(f)(1)(ii)(j).

A sign exceeding the 0.3 foot candle brightness differential, lacking the required automatic-dimming or black-screen malfunction default, or operating without the Board's conditional use permit is out of compliance with Section 10-6.108(f). The City's Community and Economic Development Department enforces sign standards through code enforcement, and a noncompliant sign can be ordered dimmed, modified, or shut off pending correction; operating an unpermitted electronic message board or digital billboard risks conditional use permit denial or revocation.

Dark Sky Rules

Modesto has no citywide dark-sky or outdoor-lighting code; the only shielded-lighting and night-sky standard in the Municipal Code sits inside the commercial cannabis chapter. Section 10-3.707(e) requires every licensed cannabis cultivation, dispensary, manufacturing or delivery site to keep its lighting fully shielded and downward-casting, barring light from spilling onto neighboring properties or being visible from those properties between sunset and sunrise.

Key details: Applies to: Licensed commercial cannabis uses only. Lighting standard: Fully shielded, downward-casting. Spillover: Barred onto neighbors or night sky. Grow lights: Contained, hidden sunset to sunrise. Cultivation sites: Vegetation screening, locking fenced gates.

A cannabis operator who lets lighting spill onto neighbors or the night sky is out of compliance with its Commercial Cannabis Permit conditions, which section 10-3.712 makes a public nuisance subject to administrative, civil, or criminal enforcement, with each day of the violation billed as a separate offense. The City Manager can also revoke or suspend the permit outright under section 10-3.705 for failing to meet the operational standards in section 10-3.707.

The Bottom Line

Modesto's outdoor lighting rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Modesto is broadly strict or permissive.

These rules come from Modesto's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.