Harkins Ridge, Grabtown Gulch and Whittemore Gulch Loop Trail

The Harkins Ridge, Grabtown Gulch and Whittemore Gulch Loop Trail is a 20.9 km looped trail that starts and ends in Woodside, San Mateo County, California. Based on our data, the hike is graded as Medium. For information on how we grade trails, please read measuring the difficulty of a hiking trail on hiiker. Also, check our latest community posts for trail updates. This hike can be completed in approx 5 hrs 45 mins. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time.