Trees Foundation Trees Foundation Trees Foundation is an environmental organization supporting NorthCoast grassroots environmental organizations since 1991 via fiscal sponsorship, graphic design, GIS mapping, office resources, staff consultations, and more. Phone: (707) 923-4377 Website: https://www.treesfoundation.org You can make a lasting difference. Show your support by making a contribution today. Donate to Trees Foundation Today! Fill out my LGL form!