An Invaluable Resource

Trees filter and clean the air, lower temperatures on hot days, add to the scenic quality of our environment and increase property values. We have ordinances in place to guide the care, pruning and removal of certain oak and landmark trees, and have included that information below. If you have questions about pests or tree diseases, please visit the University of California resource pages at  ipm.ucanr.edu. Thousand Oaks is a Tree City, USA, having held the honor for nearly 20 years. This year, we also became a BeeCity, USA!

Protected Trees

• All species of Quercus (oak) over two inches in diameter:
  Oak Tree Preservation and Protection Standards
  Oak Tree Preservation and Protection Guidelines
• Larger-sized California Sycamore, Black Walnut, Bay Laurel, Toyon: Landmark Tree Ordinance 
  Landmark Tree Ordinance does not apply to single-family properties of less than two acres.

What is a Tree's Protected Zone?

A tree's protected zone is five feet beyond the outer edge of canopy or 15 feet from trunk, whichever is greatest. Permits are required for any work impacting the tree or the soil in this area, other than removal of dead wood.

Majestic Oak Trees

Majestic Oak Trees are classified as trees with a trunk diameter of 3 feet or greater when measured at 4.5 feet above the ground. Some of the city’s largest oak trees are located in public spaces, including Conejo Open Space Conservation Agency (COSCA) trailheads, and the Los Robles Golf Course. The city's largest oak has a trunk diameter of 12 feet and is located at the Chumash Center on Lang Ranch Parkway.