Hayfield Road is a hiking, biking, and horse trail in Alameda County, California. It is within Sunol Regional Wilderness. It is 0.9 miles long and begins at 400 feet altitude. Traveling the entire trail is 1.7 miles with a total elevation gain of 529 feet. Near the trailhead there are drinking water, parking, and restrooms. Along the trail there is a watering place.
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