Metropolitan Washington Regional Outings Program of the Sierra Club
- Coordinates events and organized hikes throughout the region. Includes directions to meeting places and contact information.
- http://www.mwrop.org/

Washington Women Outdoors
- Organization offers membership information, gallery, event calendar, and links page. Activities include hiking, biking, climbing, rafting, canoeing and kayaking, and skiing.
- http://www.washingtonwomenoutdoors.org/