Dark Sky Rules: San Jose vs Santa Clara
How do dark sky rules rules compare between San Jose, CA and Santa Clara, CA?
Santa Clara has fewer restrictions than San Jose.
San Jose, CA
Santa Clara County
San Jose enforces a low-pressure sodium-preferred outdoor lighting ordinance to protect Lick Observatory on Mount Hamilton. All new fixtures must be fully shielded, and color temperature is capped at 2700K in observatory-proximate zones. Non-essential lighting must extinguish by 11:00 PM.
View full San Jose rules →Santa Clara, CA
Santa Clara County
Santa Clara zoning requires shielded outdoor lighting to prevent glare and skyglow, with specific controls for commercial properties near residential zones.
View full Santa Clara rules →Key Facts Comparison
| Fact | San Jose | Santa Clara |
|---|---|---|
| - | - | |
| Governing Code | - | SCCC Title 18 zoning regulations |
| Shielding | - | Downward-directed fixtures required |
| Property Line | - | Typically 0.5 foot-candles max at residential boundary |
| State Law | - | Title 24 Part 6 energy caps apply |
| Contact | - | Planning Division (408) 615-2450 |
Highlighted rows indicate differences between cities.
San Jose FAQ
Do I need to replace existing lights?
Existing fixtures are grandfathered unless replaced. Permit applications for tenant improvement or remodel trigger full compliance review.
Are holiday lights exempt?
Yes. Seasonal decorative lighting is exempt November 15 to January 15 if pointed downward and not aimed at the sky.
What's the color temperature limit?
2700K in the Mount Hamilton Lighting Zone closest to Lick Observatory; 3000K elsewhere in San Jose.
Santa Clara FAQ
Are string lights in my backyard regulated?
Decorative residential lighting is generally allowed as long as it does not shine directly onto neighbors windows or create glare hazards.
Does Santa Clara have a dark sky ordinance?
Not a dedicated IDA-modeled ordinance, but shielding and spillover requirements apply through zoning review.
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