Southern Arizona Hiking Club - News, meeting dates, hikes schedule, and photo gallery. Based in Tucson. - http://www.sahcinfo.org/
Off The Beaten Trail - Offers hikes and social activities. Includes events calendar and photo galleries. Based in Phoenix. - http://www.offthebeatentrail.com/
Arizona Trail Association - Works to build, maintain and promote this trail, which traverses the state from Mexico to Utah. Find news, events calendar, and history. Based in Phoenix. - http://www.aztrail.org/
Arizona Outdoor & Travel Club - Non-profit group promoting outdoor activities like hiking, camping, canoeing, and cycling. Activities are open to members and general public. Based in Phoenix. - http://www.azoutdoortravelclub.com/