Palo Alto, CA Landscaping Rules: Tree Trimming (2026)
Key Facts
- Street trees
- Permit required for all pruning
- Protected trees
- Oaks 11.5 inches plus, heritage trees
- Pruning threshold
- More than 25 percent triggers permit
- Arborist report
- Often required
- Topping
- Prohibited
Summary
Palo Alto has one of the strictest tree ordinances in California. Heritage, protected, and street trees may not be pruned more than 25 percent without a permit from the Urban Forestry program under PAMC Chapter 8.04.
4291. (a) A person who owns, leases, controls, operates, or maintains a building or structure in the state responsibility area shall at all times do all of the following: (1) (A) Maintain defensible space of 100 feet from each side and from the front and rear of the structure, but not beyond the property line, except as provided in subparagraph (B). The amount of fuel modification necessary shall consider the flammability of the structure as affected by building material, building standards, location, and type of vegetation. Fuels shall be maintained and spaced in a condition so that a wildfire would be unlikely to ignite the structure.
Full Breakdown
Palo Alto Municipal Code Chapter 8.04 (Tree Preservation) governs trimming of regulated trees. Street trees in the public right-of-way are city property and require a permit from Public Works Urban Forestry before any pruning. Private protected trees include coast live oak, valley oak, and other designated species over 11.5 inches diameter breast height, plus any tree designated as heritage. Routine light pruning for clearance is allowed, but structural pruning, crown reduction, or removal of more than about 25 percent of live foliage requires a permit and often an arborist report. Improper pruning (topping, over-thinning) can trigger fines and restoration bonds. ISA-certified arborists are recommended. Utility line clearance by PG and E follows separate rules but should still be coordinated with the city.
Frequently Asked Questions
Can I trim my own coast live oak?
Who maintains the tree in front of my house?
Sources & Official References
Other rules in Palo Alto
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Tree Trimming in Nearby Cities
How other cities in Santa Clara County handle tree trimming.