1876 AMC founded in Boston by Edward Pickering and 33 other outdoor enthusiasts
1879 First AMC hiking trail built in Tuckerman Ravine
1888 First AMC Hut at Madison Spring built
1907 First edition of AMC White Mountain Guide published
1911 Advocacy by AMC and other groups results in passage of Weeks Act, authorizing creation of Eastern National Forests
1912 New York Chapter founded as first AMC Chapter
1922 AMC moves into current headquarters at 5 Joy Street in Boston
1925 AMC helps to form Appalachian Trail Conference
1957 New Hampshire Four-Thousand Footer Club formed
1958 First Mountain Leadership School held
1968 Youth Opportunities Program launched to get urban and at-risk youth outdoors
1974 AMC partners with Friends of Bigelow and develops management plan for future Bigelow Preserve in Maine
1975 AMC wins permanent injunction against I-93 construction north of Franconia Notch based on deficiencies in project's Environmental Impact Statement
1980 AMC starts Trail Adopter program in White Mountains
1990 A Mountain Classroom school program expanded
1990 AMC plays a leadership role in founding Northern Forest Alliance
1993 AMC opens Mohican Outdoor Center in Delaware Water Gap National Recreation Area, in partnership with the US Park Service
1994 AMC negotiates Deerfield River Agreement, which becomes a national model for achieving conservation goals through the dam re-licensing process
1995 AMC launches Businesses for the Northern Forest with Northern Forest Alliance
1996 AMC begins monitoring ozone levels in the White Mountains
1996 AMC partners with the US Fish & Wildlife Service, US Forest Service and New England Wildflower Society on restoration of endangered Robbins Cinquefoil in the White Mountain National Forest
1998 AMC joins the Highlands Coalition, an advocacy group focused on land protection in the Highlands region of New York, New Jersey, Pennsylvania, and Connecticut, as fiscal agent and begins work on mapping "critical treasures" in four-state Highland region
1999 AMC, The Wilderness Society, and the Conservation Law Foundation issue "Mountain Treasures" report, calling for protection of roadless areas in the WMNF
1999 AMC granted new 30-year special use permit for operating its White Mountain hut system and Pinkham Notch Visitor Center
1999 Conservation Action Network (CAN) formed
1999 AMC selected as Eastern U.S. provider of Leave No Trace Master Educator Courses
2000 AMC creates Alpine Stewardship Program with US Forest Service
2001 AMC begins construction with Maine Appalachian Trail Club on new 42-mile Grafton Loop Trail
2002 Robbins Cinquefoil removed from Endangered Species list after 22 years, thanks to restoration efforts by AMC and partners
2002 AMC launches Leadership Training Institute
2003 AMC opens Highland Center at Crawford Notch, an outdoor program and education center based on an award-winning "green" architectural design
2003 AMC launches Maine Woods Initiative with purchase of 37,000 acres in 100-Mile Wilderness region from International Paper and purchase of Little Lyford Lodge and Cabins
2004 Highlands Conservation Act signed, based on advocacy by AMC and other members of the Highlands Coalition
2004 AMC develops computer-based windpower siting model; begins work with states to encourage adoption of uniform windpower siting guidelines
2005 AMC launches Mountain Watch "citizen-scientist" program, enabling members and guests to measure indicators of air quality and climate change
2005 AMC's Maine Woods Initiative receives $4.5 million Forest Legacy grant
2006 AMC purchases Medawisla Wilderness Lodge and Cabins, offers camp-to-camp skiing, as part of Maine Woods Initiative
2007 First online edition of White Mountain Guide offered
2007 AMC opens Greenville, Maine office as part of Maine Woods Initiative
2008 AMC dedicates Gorman Chairback Lodge and Cabins, in recognition of the leadership of Leon and Lisa Gorman in conservation, education, and outdoor recreation.
2009 AMC completes conservation purchase of 29,500-acre Roach Ponds Tract in Maine, completing 63 mile corridor of protected land in the 100-Mile Wilderness.
2010 Cumulative number of youth served by AMC's Youth Opportunities Program exceeds 100,000
2011 AMC opens Gorman Chairback Lodge and Cabins in Maine, including new LEED-registered "green" lodge building
2012 AMC Launches Kids Outdoors, a free online community to get families outdoors close to home in the Boston and New York City areas.
2012 AMC and The Trustees of Reservations announce a new collaboration to assist the Bay Circuit Alliance (BCA) in the completion, enhancement, and long-term protection of the 200-mile Bay Circuit Trail and Greenway.
2013 AMC celebrates 125 years of the White Mountain Huts.
2013 AMC launches Outdoors Rx©, an innovative program that teams up with health care providers and offers close to home programs to encourage kids and families to get outdoors.
2015 AMC completes 4300-acre Baker Mountain purchase, bringing its conservation and recreation lands in the Maine Woods to 70,000 acres.
2015 AMC announces plans for new outdoor program center at New York's Harriman State Park, to open July 2016.