Heritage & Protected Trees: Altadena vs Downey
How do heritage & protected trees rules compare between Altadena, CA and Downey, CA?
Downey has fewer restrictions than Altadena.
Altadena, CA
Los Angeles County
Oak trees ≥36 inches in diameter qualify as Heritage Oaks under LA County Code Chapter 22.174 and receive heightened review. Removal is rarely approved.
View full Altadena rules →Downey, CA
Los Angeles County
Downey's Urban Forest Management Plan and Street Tree Master Plan guide tree preservation. Street trees of significant size or species may receive additional protection. The Director designates tree varieties for parkways.
View full Downey rules →Key Facts Comparison
| Fact | Altadena | Downey |
|---|---|---|
| Heritage Threshold | ≥36 in DBH | - |
| Code Section | LA County Code Ch. 22.174 | - |
| Replacement Ratio | Up to 4:1 | - |
| UFMP | - | Urban Forest Management Plan |
| STMP | - | Street Tree Master Plan |
| Designation | - | Director selects species |
| Protection | - | Damage to street trees prohibited |
Highlighted rows indicate differences between cities.
Altadena FAQ
What is a Heritage Oak in Altadena?
Any oak with a trunk 36 inches in diameter or larger under LA County Code Ch. 22.174 — these receive heightened protection.
Downey FAQ
How is a heritage tree designated?
Based on trunk size (typically 24+ inches), species rarity, age, or historical significance. Residents may nominate trees.
Can I ever remove a heritage tree?
Only with special approval, typically from city council or tree commission. Granted mainly for safety hazards.
Compare other topics
See how Altadena and Downey compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool