Rating: Easy  

Trailhead:  Access on north side of road beside small picnic site where Summit Road splits into two one-way routes just past exit to Lower Summit Parking Lot. Drinking water and toilets at lower summit parking lot. 

Trail Statistics: About one mile flat loop trail encircling the summit of the mountain. Allow half hour without stops. Description: The first one third is paved and is wheelchair accessible up to the Ransome Point overlook. The Fire Interpretive Trail is a short loop trail  encompassing the microclimates that encircle the summit. 

Western or Foothill
Wallflower

This will guide you through the diverse flora, fauna, geology and weather which embraces Mt. Diablo’s summit.  You will be introduced to chamise, yerba santa, California native juniper, scrub oak and poison oak.  Being careful not to step on the sagebrush lizard as you skirt the summit, you’ll come across Devil’s Pulpit, a great red-colored chert monolith, made of chert. Greenstone, an altered submarine volcanic rock laid down on the ocean floor over a 100 million years ago, is the most common rock exposed on the summit of the mountain. Banded red chert, blocky greywacke sandstone and patches of shale are also present along the route.