2024
- Quail Hill Open Space Preserve
- University of California, Irvine
- George F Canyon Nature Center
- Shell Ridge Open Space
- Yolo Basin
2023
- California State Parks
- Orange County Water District
- San Juan Hot Springs
- University of California, Irvine
- Borges Ranch Open Space
2022
- Big Basin Redwoods State Park
- Borrego Village Association
- Cabrillo Marine Aquarium
- Compton Creek Natural Area
- George F Canyon Nature Center
- Silver Creek Preserve
- Vistoso Trails Nature Preserve
2021
- Bolsa Chica Wetlands Interpretive Center
- Korean War Memorial
- Lions, Tigers & Bears Big Cat and Exotic Animal Rescue
- Nix Nature Center
- Southeast Community Center
- Turlock Irrigation District
2020
- Myakka River State Park
- Collier-Seminole State Park
- San Joaquin Historical Society & Museum
- Fakahatchee Strand
- Copeland Properties
- Ritz-Carlton Laguna Niguel
- Tijuana River National Estuarine Research Reserve
- Pismo State Beach and Oceano Dunes
- San Francisco Peninsula Watershed Trail
- Franklin Canyon Park/Sooky Goldman Nature Center
- West Coyote Hills
2019
- Edward C Little Water Recycling Facility
- Aliso and Wood Canyons Wilderness Park
- Lodi Lake Nature Area
- Environmental Discovery Center at Spring Lake
- California Trail Interpretive Center
- Portola Springs Community Center
- Bolsa Chica Wetlands Interpretive Center
- Bommer Canyon
2018
- Holden Forests and Gardens
- South Cove
- Silver Creek Preserve
- Heritage Hill
- Bolsa Chica Conservancy
- Sacramento-San Joaquin Delta
- Garden Grove Unified School District
- Wyland Foundation
- Village of Putuidem at Northwest Open Space
- Agua Hedionda Lagoon
- Brand Park and Seven Trees Trail
- San Francisco Peninsula Watershed
2017
- Lindsay Wildlife Experience
- Historic Greenspot Bridge Trail
- Diamond Valley Lake Visitor Center
- Flat Ranch Preserve
- Russian River Watershed Education Center
- Monterey Presidio
- Pinole Creek
- Red Butte Garden
- San Clemente State Beach
- Hayward Shoreline Interpretive Center
- Manassas National Battlefield Park
- Upper San Gabriel Valley Municipal Water District
- Railtown 1897 State Historic Park
2016
- Palos Verdes Peninsula Land Conservancy
- Edward C. Little Water Recycling Facility
- Madrona Marsh Preserve and Nature Center
- San Diego International Airport and San Diego Air and Space Museum
- National Disaster Search Dog Foundation
- Moores Creek National Battlefield
2015
- Henrietta and Entradero Basins
- Anza-Borrego Desert State Park Panels
- Fakahatchee Strand
- Owens Lake
- University of California, Irvine Ecological Reserve
- Alameda Creek Watershed Center
- Shipley Nature Center
- Huntington Beach Wetlands Conservancy
- Orange County Water District
- The Nature Conservancy
- Kingwood Center Gardens
- Big Cypress Bend Boardwalk
- Anza-Borrego Desert State Park Interpretive Master Plan
- Hayward Shoreline Interpretive Center
2014
- Ocean Institute
- Harbor City Greenway
- Rancho Los Cerritos Historic Site
- Unidad Park
- Little Corona Marine Life Refuge
- Oregon Metro and the Oregon Zoo
- Pittsburgh Botanic Garden
- Stanfield Marsh
- Valle de Oro National Wildlife Refuge
- Placerita Canyon Nature Center
- Ameal Moore Nature Center at Sycamore Canyon
- Carpinteria State Beach
- California Living Museum
- Santiago Oaks Regional Park
- Hayward Shoreline Interpretive Center
- Silverwood Lake State Recreational Area
- Orange County Water District
2013
- National Park Service/Trail of Tears
- Crystal Cove State Park
- Redlands Conservancy
- Kuwait Institute for Scientific Research
- Heritage Farm, Seed Savers Exchange
- Aliso and Wood Canyons Wilderness Park
- Huntington Beach Wetlands Conservancy
- Bolsa Chica Conservancy
- Natural Parkland and Trail
- Catalina Verdugo and Mountain Do Trails
- Buck Gully
- Orange County Water District
- Serrano Adobe
2012
- Strathern Wetlands Park
- Pismo State Beach Visitor Center
- Agriculture Museum (Museum of Ventura County)
- Fellows Riverside Garden
- Palos Verdes Peninsula Land Conservancy
- Mount San Jacinto State Park
- Cuyamaca Rancho State Park
- Madrona Marsh Preserve
- Orange County Coastkeeper Garden
- Orange County Historical Commission
- Flight 93 National Monument
- DeForest Wetlands
- Alameda Creek Watershed Center
2011
- Quail Hill Community Center
- Bommer Canyon
- Santiago Oaks Regional Park
- River Oaks Park
- Chadwick School
- PlayCore
- Garvan Woodland Gardens
2010
- Little Bighorn Battlefield National Monument
- Lincoln Children’s Forest
- Inspiration Park
- McCrory Gardens
- Lodi Lake Park
- Placerita Canyon Nature Center
- West Basin Municipal Water District
- Cooley Landing
- Palos Verdes Peninsula Land Conservancy
- Humboldt Coastal Nature Center
- White Point Nature Preserve
- Orange County Historical Commission
- Dana Point Headlands Nature Interpretive Center
- Arlington Heights Park
- San Dieguito River Park
2009
- Education and the Environment Initiative, Managing Editorship
- Bolsa Chica Conservancy
- West Coyote Hills
- Endangered Habitats League
- Mary Vagle Nature Center
- Kern River Park
- Ecolife Foundation
- Big Canyon Creek
- Mary’s Trail: Laguna Coast Wilderness Park
2008
- White Point Nature Preserve
- Dunster Marine Reserve
- Limestone Canyon & Whiting Ranch Wilderness Parks
- Back Bay Science Center
- George F Canyon Nature Center
- Huntington Beach Wetlands Conservancy
- Agua Hedionda Lagoon
- Coral Mountain Discovery Park
- Edgewood Park and Natural Preserve
- Pacific Marine Mammal Center
2007
- Big Canyon Creek
- Irvine Ranch Conservancy
- Laguna Lake Park
- Madrona Marsh Preserve
- Chilao Visitor Center
- Dominguez Gap Wetlands
- City of Long Beach
2006
- Pennsylvania Department of Conservation and Natural Resources
- Oregon State Parks—Coos Bay Region
- Pacheco Creek
- Orange County Historical Commission
- James and Rosemary Nix Interpretive Center
- South Coast Wilderness
- San Diego Zoological Society
- Sun Valley Watershed Project
- City of Laguna Beach
- New Mexico Farm and Ranch Heritage Museum
- White Point Nature Preserve
2005
- America’s Ocean Challenge, Summerhays Films
- San Diego Zoological Society
- Los Angeles River Bikeway at Golden Shore Marine Reserve
- Laguna Lake Park Restoration Project
- Unified Education Strategy (Senate Bill 373, State of California)
- Education and the Environment Initiative
- Riley Wilderness Park
- Unified Education Strategy: State of California
- Descanso Gardens
- San Gabriel River Discovery Center
- Fitzgerald Marine Reserve
2004
- Laguna Canyon Foundation
- Irwindale Park
- Rancho Santa Ana Botanic Garden
- Guadalupe-Nipomo Dunes
- Haramokngna Cultural Center
2003
- Environmental Education Compendium on Energy Resources and the Atmosphere
- California Institute for Biodiversity
- Los Angeles Zoo
- San Mateo County Parks Environmental Education Program
- Big Sur Station
- Descanso Gardens
- Ballona Wetlands
2002
- Edgewood Park and Natural Preserve
- El Dorado Nature Center
- Alta Laguna Park
- Santa Fe Canyon
- Golden Shore Wetlands
- Environmental Education Compendium on Communities
- Santa Barbara Botanic Garden
- California Plan for Environmental Education
2001
- Rancho Santa Ana Botanic Garden
- Descanso Gardens
- Laguna Coast Wilderness Park
- Redwood National and State Parks
- Long Beach Harbor
1999
- California Institute for Biodiversity
- Forest Service History Center
- Santa Barbara Botanic Garden
- Santa Rosa Plateau Ecological Reserve and Multi-Species Reserve
- Ormond Beach Habitat Resource Area
- Santa Barbara Botanic Garden
- Descanso Gardens
- Integrated Waste Management Environmental Education Compendium Project
- The Huntington Botanical Gardens
- San Gabriel Canyon
1998
- Pt. Vicente Interpretive Center
- El Dorado Nature Center
- Bear Divide Chaparral Trail
- Lost Valley Scout Reservation
1997
- George F Canyon Preserve in Rolling Hills Estates
- Sepulveda Basin Wildlife Park
- Canyon Park Nature Center
1996
- Chaffee Zoological Gardens of Fresno
- Water Resources Environmental Education Compendium
- Western San Gabriel Watchable Wildlife Tour
1995
- Mt. Baldy Visitor Center
- Bolsa Chica Interpretive Center
- Department of Conservation Evaluation Study
- California State Parka Environmental Education Training Program
1994
- Golden Cup Discovery Trail
- Energy Resource Center
- West Fork of the San Gabriel River
- Curriculum Development, University of California Natural Reserve System
- Wildlife Refuge Feasibility Study
- Human Communities Environmental Education Compendium
- Grassy Hollow Visitor Center
1993
- Caring for the Land Exhibit
- Whispering Pines Trail Guide
- Alandale Ranger Station
- Curriculum Development for Texas A & M University
- Curriculum Development for Opera Pacific
1992
- Zoo Discovery Program