LEAF – Frontier Park’s Nonprofit Partner. The Lake Erie Arboretum at Frontier Park (LEAF) is a tree museum located within Frontier Park, a city park in Erie, PA. LEAF is home to over 1000 trees, a collection that grows in interest and diversity each year. Many of the trees in the arboretum have been sponsored and will display a plaque bearing the Latin and common name of the tree. LEAF’s mission is to create a greater awareness of the importance of trees to our lives by creating educational opportunities and outdoor experiences for our community. LEAF has transformed Frontier Park into a hub for community activity with a variety of educational offerings and outdoor experiences for all ages. LEAF is responsible for many of the improvements to Frontier Park ranging from bridges and pathways to increased accessibility. The LEAF Education Center, which is available for rent, provides restroom facilities, serves as an indoor classroom, and features a vegetative roof that reduces and cleanses storm water runoff. LEAF is free to all visitors and we invite you to explore the arboretum’s beauty during each season. Stroll along our pathways, sit at our virtual tree gazebo, walk amid shade, flowering and evergreen trees, and enjoy the beauty that is Cascade Creek.