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Tree Swallows


Seasonal Tree Trimming
when to trim your trees so that the birds are not harmed
photo of Sycamore in Bommer Canyon by RL Kenyon
Wait before you trim that tree!
Is it the correct season?
Did you know tree trimming in spring and early summer is irresponsible and possibly illegal?  This can damage trees and devastate nesting birds.
Keep  trees healthy!
Cutting, trimming and pruning during spring and early summer can lead to diseased trees and intrusion of pests that harm trees.  Fall is the best time to trim branches when trees are dormant!
Keep nesting birds safe!
Hawk nests are large and visible, but the majority of songbird nests are small and camouflaged.  Tree trimmers may not see nests until too late.  Also, loud activity of tree trimming can disturb birds in surrounding trees.
What does the law say?
Birds and active nests are protected from harm or harassment by the Migratory Bird Treaty Act. California Department of Fish & Game and the U.S. Fish and Wildlife Service will issue citations and levy fines to individuals and companies that blatantly disregard the regulations.
Actions to help trees & birds:
Trim and prune during the fall and winter when trees are dormant.
Hire arborists, landscapers and tree trimmers who are concerned with the health of your trees and the birds that nest in them.
Avoid contracting services that only trim trees (they have to work year-around).
If you see tree trimmers disturbing an active nest, TAKE A PICTURE of the nest, the destruction, and the company's name.  Report violations to the Law Enforcement Office of U.S. Fish & Wildlife Service at (310) 328-1516  (Office of Investigations and Compliance Inspection).

You can help protect Orange County's
Trees & Nesting Birds! 

The International Society of Arboriculture is a non-profit organization supporting tree care research around the world and dedicated to the care and preservation of shade and ornamental trees.
Information on the International Society of Arboriculture (ISA), click here.
This ISA website covers the following areas:
Tree buying and planting
What your tree needs and why
Proper tree care techniques
Pruning your trees
Tree hazards and treatments

Find an ISA Certified Arborist near you:
Type in your zip code or city to obtain a list of certified arborists in your area.

The urban environment we enjoy is unique and very important to our feathered friends.  Birds nest in the bushes and trees in our yards between early February and August.




Sea & Sage Audubon Society
PO Box 5447 • Irvine, CA 92616 • 949-261-7963