PG&E, Black Mountain, Chamise and Rogue Valley Trail Loop

The main trailhead for the PG&E, Black Mountain, Chamise and Rogue Valley Trail Loop is located within the Rancho San Antonio Open Space Preserve. While parking is available, it can be challenging to find a spot due to the preserve's popularity, especially on weekends. Arriving early in the morning is highly recommended to secure parking.

No, this loop is considered difficult and is not recommended for beginners. It features significant elevation changes, including steep ascents like the Quarry Trail (800 feet in just over a mile) and sustained climbs towards Black Mountain. It's best suited for experienced joggers looking for a challenging hill training run.

Given its distance of approximately 23.7 km (14.7 miles) and over 600 meters (2,000 feet) of elevation gain, this is a demanding route. For an experienced jogger, it can take around 3 to 4 hours, but this can vary significantly based on fitness level and pace. It's an ideal route for a long, hilly training run.

The terrain is diverse and challenging. You'll encounter wide fire roads, like the PG&E Trail, which undulate through canyons with both shaded and sunny sections. Other parts, such as the Quarry Trail and Black Mountain Trail, involve steep, sustained climbs. The Chamise Trail has both ascents and descents, while the Rogue Valley Trail follows a streambed, offering cooler, shaded sections but also includes a steep climb to the High Meadow Trail.

This loop offers spectacular views. As you climb the PG&E Trail, you'll get increasingly expansive views of the San Francisco Bay. From Vista Point and higher, stunning panoramas of Silicon Valley unfold. The summit of Black Mountain provides breathtaking 360-degree views of Silicon Valley to the north and the Santa Cruz Mountains to the south. Don't miss the View of San Francisco Bay from Upper High Meadow Trail.

Spring is particularly beautiful, especially when the chamise blooms on the Chamise Trail, creating a tunnel of white flowers that attract butterflies and bees. Fall offers pleasant temperatures and clear views. While accessible year-round, be aware that the Rogue Valley Trail can experience heavy frost in winter due to limited sun exposure, and summer can be very warm on exposed sections.

Regulations for dogs in Rancho San Antonio Open Space Preserve can vary. It's best to check the official Midpeninsula Regional Open Space District website for the most current rules regarding dogs, including leash requirements and permitted trails, before you visit.

No, there are typically no entrance fees or permits required to access trails within the Rancho San Antonio Open Space Preserve, where this loop is located. However, always check the official Midpeninsula Regional Open Space District website for any updates or specific regulations.

The diverse habitats along the loop support various wildlife. In the mornings, especially along the Rogue Valley Trail, you might spot rabbits and deer. The blooming chamise in spring attracts numerous butterflies and bees. Keep an eye out for various bird species throughout the preserve.

Yes, this extensive loop connects various trails within Rancho San Antonio Open Space Preserve and can even be extended into the adjacent Monte Bello Open Space Preserve. The route utilizes sections of the Chamise Trail, Upper Rogue Valley Trail, Rogue Valley Trail, Upper High Meadow Trail, Black Mountain Trail, and Quarry Trail, among others, allowing for varied and longer running options.

Near the main trailhead, you'll find Deer Hollow Farm, which offers a flatter, easier-to-run section. This area is popular with families and can be a good spot for a gentle warm-up or cool-down before tackling the more challenging parts of the loop.