Whittemore Gulch and Harkins Ridge Loop

The most common starting point for this loop is from the Higgins Canyon Road entrance to the Purisima Creek Redwoods Open Space Preserve. There is a parking lot available there. Arriving earlier in the day, especially on weekends, is recommended as it can fill up.

The trail is enjoyable year-round, but spring offers lush greenery, wildflowers, and gushing creeks. Fall provides cooler temperatures and beautiful foliage. Even in summer, the redwood canyons offer a refreshing escape from the heat. Be prepared for potential fog on the ridge, which can add a unique atmospheric experience.

Regulations regarding dogs can vary within the Purisima Creek Redwoods Open Space Preserve. It's always best to check the official Midpeninsula Regional Open Space District website or signage at the trailhead for the most current rules regarding dogs on this specific loop.

No, there are typically no entrance fees or permits required to access the trails within the Purisima Creek Redwoods Open Space Preserve, including the Whittemore Gulch and Harkins Ridge Loop. It is free to enjoy.

The terrain is quite varied. You'll experience well-maintained natural earth paths through dense redwood forests in Whittemore Gulch, which can be muddy after rain. As you ascend towards Harkins Ridge, the trail transitions to more exposed coastal scrub. Expect exposed roots and rocks in some sections, and the final climb on Harkins Ridge can be steep.

This loop offers a stunning contrast of scenery. You'll be immersed in majestic redwood forests with lush undergrowth and the sound of gushing water along Purisima Creek. As you gain elevation, particularly from Harkins Ridge, you'll be treated to magnificent coastal views of Half Moon Bay and the Pacific Ocean, including the Pillar Point Overlook.

The redwood forests are home to an understory of ferns, hogweed, thimbleberries, and various wildflowers. You're also likely to spot banana slugs, which are a common sight in the moist redwood environment. Keep an eye out for poison oak in the more exposed, sunnier sections of Harkins Ridge.

This loop is generally rated as moderate to difficult due to its significant elevation gain (over 500 meters) and length (over 11 km). It's a challenging hike that requires a good level of fitness. Beginners might find the sustained uphill climbs, especially on Harkins Ridge, quite demanding.

Yes, the route incorporates sections of several other trails within the preserve. You'll hike along parts of the Harkins Ridge Trail, Whittemore Gulch Trail, and the North Ridge Trail, among others. It also briefly touches upon the Bay Area Ridge Trail.

Consider hiking the loop in a counter-clockwise direction. This approach starts with a gentler downhill section into Whittemore Gulch, allowing you to enjoy the redwoods before tackling the challenging, but rewarding, uphill climb on Harkins Ridge towards the end. This way, you save the panoramic coastal views as a grand finale.

Given the trail's length and elevation changes, bring plenty of water, snacks, and layers of clothing as temperatures can vary between the shady canyons and exposed ridges. Sturdy hiking shoes with good grip are essential, and trekking poles can be helpful for the steeper sections.