Ted Olson Nature Preserve is located on the east side of Madison Ave North between Valley and Winters Roads. The initial 10-acres were donated to the Bainbridge Island Park District in 1973 by Theodore Olson, whose family had owned the property since the turn of the century.
In 1982 members of Scout Troop 565 developed a .3 mile nature trail through the property with help from the Bainbridge Island Garden Club and the Park District. Walkers can follow the trail with the help of a pamphlet, available at the Park District, which describes the plants and trees along the way.
In June of 2010 the 5-acre Kallgren Addition trail was added through the efforts of the Bainbridge Island Land Trust and the Ted Olson Nature Preserve neighbors and friends.