McCall Hiking Club
Founded in 2003, this not-for-profit club explores the mountainous country of central Idaho during hikes, and also organizes activities such as kayaking, snowshoeing and cross country skiing. Though there are about 135 members, the hiking groups are kept small.
Idaho Alpine Club
This club, based in Idaho Falls, celebrated 50 years in May 2010. Non-motorized activities are the focus of this group, which in addition to hiking gets together for kayaking, rafting, backpacking, bicycling, trail maintenance and even spelunking.
Bouder-White Clouds Council
This nonprofit organization, which was formed in 1989, works to protect the 500,000 acre Boulder-White Cloud Mountains which are the largest roadless, unprotected area in the continental United States. Each summer the Boulder White Clouds Council holds an outings program in which all events are lead by volunteers. These donation-only trips go to places such as the Boulders-White Clouds, Sawtooths, Smokeys, Pinoneer and Salmon River Mountains.
Idaho Mountain Recreation
IMR is geared toward connecting outdoor enthusiasts, many of which are in their 30s. This group organizes hiking trips as well as other activities with trip leaders, offers monthly meetings and also offers classes such as Wilderness First Aid.
Boise Trail Heads
This Meetup group, founded in 2009 in Boise, has over 6,000 members. Group activities include hiking, snowshoeing, camping and backpacking. There is a leadership team which organizes this group, but members can suggest ideas and communicate through the Boise Trail Heads site on Meetup.com.