Flag Hill Loop Trail is a 3.7 mile moderately trafficked loop trail located near Sunol, CA that features beautiful wild flowers and is rated as difficult. The trail offers a number of activity options and is accessible year-round. Dogs are also able to use this trail.
A short, steep hike up Flag Hill promises grand scenery and offers a great way to introduce your kids to hiking. Sunol Regional Wilderness is one of the best hiking locales in the East Bay hills northeast of Silicon Valley. This Flag Hill Loop is one of the best ways to see Sunol. This loop is relatively short at 3.7 miles, but it's no cakewalk: Flag Hill summit is 1.3 miles and 900 feet above the Sunol headquarters. It's a tough climb, but it's over soon enough to suit youngsters' short attention spans. The view from the top is one of the best in the Bay Area, well worth the climb. In springtime, the hills are popping with California poppies and many more wildflowers. Once you've soaked up the view from Flag Hill, it's all downhill back to the park headquarters.
Hiked this loop today with 6 kids and 3 adults. Kids in the age group 5 - 9 all made a without too much trouble. We even carried our 2 month old up with us as well. It's a beautiful hike, quite steep uphill, with spectacular views. One of my favorite hikes in the Bay Area now.