Costa Mesa, CA Tree Protection: Heritage & Protected Trees (2026)

Costa Mesa's heritage tree protections operate through the city's landscaping and development review standards in Title 13 of the Municipal Code. Heritage trees are generally defined as mature specimens of significant size, age, species rarity, or historical importance. Common heritage-eligible species in Costa Mesa include California sycamore, coast live oak, Torrey pine, and mature specimen trees with trunk diameters exceeding a threshold established in the city's landscape standards. When development projects, additions, or grading work affect properties with heritage trees, the Planning Division requires the applicant to identify all existing trees on the site plan with species, trunk diameter, and canopy spread. Heritage trees must be preserved unless the applicant demonstrates that preservation is infeasible due to the tree's condition, location, or conflict with a reasonable use of the property. A California licensed arborist report is required to support any request to remove or significantly prune a heritage tree, addressing the tree's health, structural integrity, and alternatives to removal. If removal is approved, the city may require replacement at an enhanced ratio — two or more replacement trees for each heritage tree removed — with species and size approved by the Planning Division. During construction on properties with heritage trees, tree protection fencing must be installed at the drip line to prevent soil compaction, grade changes, and root damage. The Public Works Department maintains an inventory of significant street trees that receive heritage-level protection. Costa Mesa's commitment to its urban canopy is reflected in the city's participation in regional urban forestry programs.