| 2025 | Winner | Turning to Stone: Discovering the Subtle Wisdom of Rocks | Marcia Bjornerud | Unknown |
| 2024 | Winner | Halcyon Journey: A Search for the Belted Kingfisher | Marina Richie | Unknown |
| 2023 | Winner | Bayou D’Arbonne Swamp: A Naturalist’s Memoir of Place | Kelby Ouchley | Unknown |
| 2022 | Winner | Islands of Abandonment: Life in the Post-Human Landscape | Cal Flyn | HarperCollins |
| 2021 | Winner | Sprout Lands: Tending the Endless Gift of Trees | William Bryant Logan | Unknown |
| 2020 | Winner | Entangled: People and Ecological Change in Alaska's Kachemak Bay | Marilyn Sigman | Unknown |
| 2018 | Winner | The Songs of Trees | David George Haskell | Unknown |
| 2016 | Winner | Diary of a Citizen Scientist | Sharman Apt Russell | Unknown |
| 2015 | Winner | Dominion of Bears | Sherry Simpson | Unknown |
| 2014 | Winner | Sightlines | Kathleen Jamie | Unknown |
| 2013 | Winner | Feathers: The Evolution of a Natural Miracle | Thor Hanson | Unknown |
| 2012 | Winner | Sex and the River Styx | Edward (Ted) Hoagland | Unknown |
| 2011 | Winner | The Sound of a Wild Snail Eating | Elisabeth Tova Bailey | Unknown |
| 2010 | Winner | Sand: The Never-Ending Story | Michael Welland | Unknown |
| 2009 | Winner | Confluence: Merrymeeting Bay | Franklin Burroughs | Unknown |
| 2008 | Winner | The Fragile Edge: Diving and Other Adventures in the South Pacific | Julia Whitty | Unknown |
| 2007 | Winner | Eating Stone: Imagination And The Loss Of The Wild | Ellen Meloy | Pantheon |
| 2006 | Winner | The Singing Life of Birds | Donald Kroodsma | Unknown |
| 2005 | Winner | Gathering Moss: A Natural and Cultural History of Mosses | Robin Wall Kimmerer | Unknown |
| 2004 | Winner | Liquid Land: A Journey Through The Florida Everglades | Ted Levin | Unknown |
| 2003 | Winner | Eye of the Albatross: Visions of Hope and Survival | Carl Safina | Unknown |
| 2002 | Winner | Wilderness and Razor Wire | Ken Lamberton | Unknown |
| 2001 | Winner | Swampwalker's Journal | David M. Carroll | Unknown |
| 2000 | Winner | Mind of the Raven: Investigations and Adventures With Wolf-Birds | Bernd Heinrich | Unknown |
| 1999 | Winner | Wind: How the Flow of Air Has Shaped Life, Myth, and the Land | Jan DeBlieu | Unknown |
| 1998 | Winner | In a Desert Garden:Love and Death Among the Insects | John Alcock | Unknown |
| 1997 | Winner | The Song of the Dodo: Island Biogeography in an Age of Extinctions | David Quammen | Scribner |
| 1996 | Winner | Water, Ice and Stone:Science and Memory on the Antarctic Lakes | Bill Green | Unknown |
| 1995 | Winner | Into Africa | Craig Packer | Unknown |
| 1994 | Winner | The Crystal Desert: Summers in Antarctica | David G. Campbell | Unknown |
| 1993 | Winner | Crickets and Katydids, Concerts and Solos | Vincent Dethier | Unknown |
| 1992 | Winner | Dolphin Days: The Life and Times of the Spinner Dolphin | Kenneth S. Norris | Unknown |
| 1991 | Winner | The Island Within | Richard Nelson | Unknown |
| 1990 | Winner | The Control of Nature | John McPhee | Farrar, Straus and Giroux |
| 1989 | Winner | On Watching Birds | Lawrence Kilham | Unknown |
| 1988 | Winner | Bay Country | Tom Horton | Unknown |
| 1987 | Winner | Wintergreen: Rambles in a Ravaged Land | Robert Michael Pyle | Unknown |
| 1986 | Winner | Gathering the Desert | Gary Paul Nabhan | Unknown |
| 1985 | Winner | Cry of the Kalahari | Mark Owens, Delia Owens | Unknown |
| 1984 | Winner | The Klamath Knot: Explorations of Myth and Evolution | David Rains Wallace | Unknown |
| 1983 | Winner | A Naturalist on a Tropical Farm | Alexander F. Skutch | Unknown |
| 1982 | Winner | Sand Rivers | Peter Matthiessen | Unknown |
| 1981 | Winner | On the Road with John James Audubon | Mary Durant, Michael Harwood | Unknown |
| 1979 | Winner | Of Wolves and Men | Barry Lopez | Open Road Integrated Media |
| 1978 | Winner | Desert: The American Southwest | Ruth Kirk, Louis Kirk | Unknown |
| 1977 | Winner | A Sand County Almanac | Aldo Leopold | Unknown |
| 1976 | Winner | Run, River, Run | Ann Haymond Zwinger | Unknown |
| 1974 | Winner | Wilderness Days | Sigurd F. Olson | Unknown |
| 1973 | Winner | The Forests and Wetlands of New York City | Elizabeth Barlow | Unknown |
| 1972 | Winner | The Lord's Woods: The Passing of an American Woodland | Robert S. Arbib | Unknown |
| 1971 | Winner | From Laurel Hill to Siler's Bog | John K. Terres | Unknown |
| 1970 | Winner | The Year of the Whale | Victor B. Scheffer | Unknown |
| 1969 | Winner | The Lovely and the Wild | Louise de Kiriline Lawrence | Unknown |
| 1968 | Winner | Hill Country Harvest | Hal Borland | Unknown |
| 1967 | Winner | The Winter Beach | Charlton Ogburn, Jr. | Unknown |
| 1966 | Winner | The Gull's Way | Louis Darling | Unknown |
| 1965 | Winner | Roadless Area | Paul Brooks | Unknown |
| 1964 | Winner | The Great Beach: A Naturalist Explores the Frontier Between Land and Sea on the Outer Reaches of Cape Cod | John Hay | Unknown |
| 1963 | Winner | A Naturalist in Alaska | Adolph Murie | Unknown |
| 1962 | Winner | Iceland Summer: Adventures of a Bird Painter | George Miksch Sutton | Unknown |
| 1961 | Winner | The Firmament of Time | Loren Eiseley | Unknown |
| 1960 | Winner | A Natural History of New York City | John Kieran | Unknown |
| 1958 | Winner | On the Trail of the Vanishing Birds | Robert Porter Allen | Unknown |
| 1957 | Winner | The Windward Road: Adventures of a Naturalist on Remote Caribbean Shores | Archie Fairly Carr | Unknown |
| 1956 | Winner | Song of the Sky | Guy Murchie | Unknown |
| 1954 | Winner | The Desert Year | Joseph Wood Krutch | Unknown |
| 1953 | Winner | The Bay | Gilbert Klingel | Unknown |
| 1952 | Winner | The Sea Around Us | Rachel Carson | Oxford University Press |
| 1950 | Winner | Birds Over America | Roger Tory Peterson | Unknown |
| 1949 | Winner | Flight Into Sunshine: Bird Experiences in Florida | Helen G. Cruickshank | Unknown |
| 1948 | Winner | Driftwood Valley | Theodora Stanwell-Fletcher | Unknown |
| 1946 | Winner | Snowshoe Country | Florence Page Jaques | Unknown |
| 1945 | Winner | This Green World | Rutherford Platt | Unknown |
| 1943 | Winner | Near Horizons: The Story of an Insect Garden | Edwin Way Teale | Unknown |
| 1942 | Winner | Birds of the Grey Wind | Edward A. Armstrong | Unknown |
| 1941 | Winner | Birds Against Men | Louis J. Halle, Jr. | Unknown |
| 1940 | Winner | Life Histories of North American Birds | Arthur Cleveland Bent | Unknown |
| 1939 | Winner | Adventures in Bird Protection | T. Gilbert Pearson | Unknown |
| 1938 | Winner | Oceanic Birds of South America | Robert Cushman Murphy | Unknown |
| 1936 | Winner | Recordings of Bird Calls | Charles Crawford Gorst | Unknown |
| 1934 | Winner | Wild Pasture Pine | W.W. Christman | Unknown |
| 1933 | Winner | Spring, Summer, Fall, Winter (set) | Oliver P. Medsger | Unknown |
| 1932 | Winner | A Canyon Voyage: A Narrative of the Second Powell Expedition | Frederick S. Dellenbaugh | Unknown |
| 1930 | Winner | Peace in the Heart | Archibald Rutledge | Unknown |
| 1929 | Winner | Handbook of Birds of Eastern North America | Frank M. Chapman | Unknown |
| 1927 | Winner | Lives of Game Animals | Ernest Thompson Seton | Unknown |
| 1926 | Winner | Pheasants of the World | William Beebe | Unknown |