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Ecology Trail


Length: 1.4 miles (2.2 kilometers)
Type: pedestrian on upper trail; multiuse (pedestrians and cyclists) on lower trail
Difficulty: moderate to difficult
With distinctive habitats from shaded forests to serpentine grasslands, it’s easy to understand why this pathway is called the Ecology Trail. The route lies within the Presidio’s largest watershed, Tennessee Hollow, and connects the Arguello Gate and Inspiration Point to the historic Main Post. A variety of California native plants can be seen here, from the endangered Presidio Clarkia, which supports pink blooms in spring, to majestic oaks and redwood trees. A spur trail connects to El Polín Spring, an “outdoor classroom” known for history, birdwatching, and a terrific new picnic area.






Trail Connections
Trail Profile (upper trail)
This chart shows an elevation profile of the trail. For detailed information, please refer to the Terrain Information section at the right hand side of the screen.
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 Terrain Information

Average grade is 8%
Maximum grade is 16%​
​Average cross slope is 3%
Maximum cross slope is 9%
Average tread width is 10 feet
Minimum width is 4 feet
​The trail surface is gravel and compacted earth

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