Dark Sky Rules: Ontario vs Rancho Cucamonga
How do dark sky rules rules compare between Ontario, CA and Rancho Cucamonga, CA?
Ontario and Rancho Cucamonga have similar restriction levels.
Ontario, CA
San Bernardino County
Ontario regulates outdoor lighting under OMC Chapter 9, requiring shielded fixtures and color temperature limits to reduce glare toward homes and aircraft paths at ONT International Airport.
View full Ontario rules →Rancho Cucamonga, CA
San Bernardino County
Rancho Cucamonga Development Code Section 17.58 requires shielded, full-cutoff outdoor lighting to minimize glare and skyglow. New installations must direct light downward onto the subject property.
View full Rancho Cucamonga rules →Key Facts Comparison
| Fact | Ontario | Rancho Cucamonga |
|---|---|---|
| Fixture type | Full-cutoff shielded | Full-cutoff shielded |
| CCT limit | 3000K | - |
| Curfew dim | 50% after 11 PM (industrial) | - |
| Airport | ALUCP lighting restrictions | - |
| Code section | - | RCMC 17.58 |
| Color temperature | - | 3000K or lower |
| Boundary limit | - | 0.5 foot-candles |
| Contact | - | (909) 477-2750 |
Highlighted rows indicate differences between cities.
Ontario FAQ
Can I install a bright driveway floodlight?
Yes, if the fixture is shielded and light does not trespass past your property line onto a neighbor.
Does Ontario have a true dark-sky ordinance?
Ontario does not have an IDA-level dark-sky law, but airport overlay zones and zoning shielding rules provide similar outcomes.
Rancho Cucamonga FAQ
Can I install a standard floodlight above my garage?
Only if it is fully shielded and directs light downward; unshielded floodlights typically violate the ordinance.
Are holiday lights subject to the dark sky rules?
Temporary holiday lighting is exempt between November 1 and January 15 each year.
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