Albany Running Exchange
Trail running club based in Albany, New York. Includes summer trail run series, results, calendar, photos, and member news.
American Discovery Trail
Learn about the first running trail that crosses the entire nation.
Gil's Athletic Club
Trail running club based in Topsfield, Massachusetts, sponsoring several trail races (primarily ultras). In addition to race information, includes weekly runs, guide to area trails, and photos.
Rocky Mountain trail guides with maps and descriptions. World mountain running trophy information on venues, maps, results. Guide to trail accommodations available.
Northern Arizona Trail Runner's Association
Promotes trail running in Northern Arizona, in the United States. Includes a listing of upcoming races, related links, history of the organization, pictures, membership details, race summaries, and message board.
Peak Trail Runner
A guide to trail running in the UK Peak District national park.
Run Hayward Hills Trails
Trails of Hayward, California. Great for running and riding ATB.
Trail running club in Somers, Connecticut, sponsoring the Soapstone Mountain races as well as weekly training runs. Includes race information and results, photos, and links.
Trail Runner Magazine Online
Running, health, travel, and training, race results and race event calendars.
Includes gear reviews, race calendar, online store, and discussion board.
eHow to Choose Trails for Trail Running
Tips and information about trail running. Requires free membership.