Question
When did Leave No Trace become a nonprofit?
Short answer
In 1994. It grew from a formal curriculum the U.S. Forest Service developed with the National Outdoor Leadership School in the late 1980s.
Source: The Leave No Trace Story
Where this answer comes from
Leave No Trace is a nonprofit in Boulder, Colorado, that teaches seven principles for low-impact time outdoors. It became an independent nonprofit in 1994.
Read the full organization