Tree Removal & Heritage Trees: Petaluma vs Sonoma

Do I need a permit to cut down a tree in unincorporated Sonoma County?

Yes if the tree is a protected native species measuring 6 inches in diameter or greater at breast height, or a designated heritage/landmark tree. Section 26-88-010(m) requires a zoning permit and mitigation; Chapter 26D requires a separate tree permit for heritage and landmark trees.

Which tree species are protected in Sonoma County?

Protected native species under §26-88-010(m) include valley oak, coast live oak, blue oak, black oak, maples, cottonwoods, alders, willows, redwoods, and several listed native pines and cypresses. Non-native species (eucalyptus, ornamentals) are generally exempt.

Are there any tree-removal exemptions in Sonoma County?

Yes. The April 2024 update preserves exemptions for hazardous, dead, dying, or diseased trees that threaten structures; trees below the size threshold; routine residential maintenance; and removals required for defensible space under fire safety rules.

What is the penalty for removing a protected tree without a permit?

Penalties include administrative citations under County Code Chapter 1, mandatory replanting (often at higher ratios), and assessment of in-lieu mitigation fees at roughly $510 per arboreal value point. Unauthorized removal of a designated heritage tree can rise to misdemeanor prosecution.

Does Sudden Oak Death affect oak removals?

Yes. Sonoma County is within the regulated Sudden Oak Death (Phytophthora ramorum) area. Oak removals — especially of infected wood — must follow state quarantine rules administered by CDFA, and movement of infected wood off-site is restricted.

Do I need a permit to cut down a tree in unincorporated Sonoma County?

Yes if the tree is a protected native species measuring 6 inches in diameter or greater at breast height, or a designated heritage/landmark tree. Section 26-88-010(m) requires a zoning permit and mitigation; Chapter 26D requires a separate tree permit for heritage and landmark trees.

Which tree species are protected in Sonoma County?

Protected native species under §26-88-010(m) include valley oak, coast live oak, blue oak, black oak, maples, cottonwoods, alders, willows, redwoods, and several listed native pines and cypresses. Non-native species (eucalyptus, ornamentals) are generally exempt.

Are there any tree-removal exemptions in Sonoma County?

Yes. The April 2024 update preserves exemptions for hazardous, dead, dying, or diseased trees that threaten structures; trees below the size threshold; routine residential maintenance; and removals required for defensible space under fire safety rules.

What is the penalty for removing a protected tree without a permit?

Penalties include administrative citations under County Code Chapter 1, mandatory replanting (often at higher ratios), and assessment of in-lieu mitigation fees at roughly $510 per arboreal value point. Unauthorized removal of a designated heritage tree can rise to misdemeanor prosecution.

Does Sudden Oak Death affect oak removals?

Yes. Sonoma County is within the regulated Sudden Oak Death (Phytophthora ramorum) area. Oak removals — especially of infected wood — must follow state quarantine rules administered by CDFA, and movement of infected wood off-site is restricted.