In 2003, TPL assisted the Appalachian Mountain Club (AMC) in purchasing the Katahdin IronWorks property as the first project in AMC's MaineWoods Initiative.
The Trust for Public Land is currently working on several projects to protect Maine's northern forests.
The Trust for Public Land established the Northwoods Initiative to protect the iconic landscapes of northern Minnesota, Wisconsin, and Michigan.
The Trust for Public Land purchased Long Island in Minnesota's Burntside Lake, at the headwaters of the Boundary Waters Canoe Area Wilderness and across from Listening Point, which inspired conservation writer Sigurd Olson.
For generations, the private timberlands of Minnesota's Northwoods have supported jobs, provided wildlife habitat and clean water, offered recreation to local residents, and attracted millions of visitors each year. But as rising land values make land more valuable as real estate than timberland, land is being broken up and sold for second-home development.
For years, a battle raged between local conservation-minded landowners and would-be developers of over 260 acres of Dead Lake shoreline. Proposed development included 151 residential housing units, a general store, a restaurant, two swimming pools, a marina, and mooring facilities.
TPL helped protect the Sugar Hills property, which contains a popular ski trail system, clear water creeks, a 14-acre lake, and "Big Thunder Peak," one of the state's highest named summits.
In the Brainerd Lakes area, The Trust for Public Land led an effort to purchase a working forest conservation easement over 4,776 acres of prime forestland owned by the Potlatch Corporation.
More than 5,700 acres of private forest bordering four miles of the Long Trail State Forest, the nation's oldest long-distance hiking trail, have been permanently protected.
In 2010, TPL, together with the U.S. Forest Service, protected Bear
Creek Ranch, one of the largest inholdings in Gila National Forest.