At 922 feet in elevation, Twin Peaks is second only to Mt. Davidson in height, offers spectacular views of the Bay Area, and is a world-famous tourist attraction. Originally called “Los Pechos de la Choca” (Breasts of the Maiden) by early Spanish settlers, these two adjacent peaks provide postcard views and a treasure trove of animal and plant diversity. Most visitors to Twin Peaks drive (or take a tourist bus) to the north peak parking lot to enjoy 180-degree views of the Bay Area.
Many miss an opportunity to experience the coastal scrub and grassland communities of this 64-acre park. Similar to the Marin Headlands, Twin Peaks gives us an idea of how San Francisco’s hills and peaks looked before grazing and then development changed them forever. The vegetation is primarily a mix of grassland and coastal scrub. Expect strong winds as you hike among plants such as coyote brush, lizard tail, pearly everlasting and lupine. The endangered Mission Blue Butterfly has adapted to the strong winds and flies low to the ground from lupine to lupine. Native plants provide habitat for brush-nesting birds like the white-crowned sparrow and animals such as brush rabbits and coyotes.
San Francisco Public Works is moving forward as planned with the second phase of Twin Peaks Boulevard repaving. The paving work includes the portion of the “Figure 8” that is currently closed to motorists as part of SFMTA’s pilot road closure. This work—and road closures and rerouting—is proceeding more quickly … Continue reading
The newly renovated trail and steps up and over the north (Eureka) peak of Twin Peaks are now open to the public. Access on the north side of the peak opened on March 31, and access on the south side of the peak opened yesterday, April 10. Take a hike and check … Continue reading
The northern half of trail on the north (Eureka) peak at Twin Peaks (Twin Peaks Boulevard and Christmas Tree Point Road) re-opened to the public this afternoon! See before and after photos below. Thank you for your patience as we take the next two weeks to wrap up trail improvements … Continue reading
Despite rain and winds since construction start, our contractor is making progress on trails improvement at Twin Peaks. Old steps on the north peak have been removed and construction on new steps has begun. Thank you for your patience and for keeping off the north peak until it is reopened. … Continue reading
The Twin Peaks trails improvement contractor team mobilized Monday morning, January 23rd. After installing temporary fencing for erosion control and protection of sensitive habitat area, the north (Eureka) peak will be closed to the public so contractor team can remove and replace steps. Trail closure signage and protective fencing has … Continue reading
Twin Peaks is a prominent dividing point for the summer coastal fog. West-facing slopes receive substantial fog and strong winds, while east-facing slopes receive more sunlight and warmth. The vegetation is primarily a mix of grassland and coastal scrub. Expect strong winds as you hike among plants such as coyote brush, lizard tail, and pearly everlasting. These plants provide habitat for brush-nesting birds like the white-crowned sparrow and animals such as brush rabbits.
In recent years coyotes have been spotted on Twin Peaks; this native mammal, once prevalent in San Francisco, had gone extinct from the city but now is making its way back. If you are lucky enough to see one of these elusive creatures, please don’t try to approach or feed it, for its safety and yours. Remember that a fed coyote is a dead coyote: While not normally a threat to humans, coyotes that become too accustomed to being approached can become aggressive. Keep your dog on leash in areas that coyotes are known to frequent, for its own safety. For more information about learning to coexist with coyotes, see Project Coyote.
Mission Blue Butterfly
The mission blue butterfly is a federally listed endangered species that still survives in a few areas of San Francisco, Marin, and San Mateo counties. In 2009, 22 pregnant female mission blues were released on Twin Peaks, the only place this butterfly has survived within the city. Look for the light blue, quarter-sized butterfly in the park’s rocky grasslands, which contain the three species of lupine it uses for food and to lay its eggs. NAP has developed a recovery plan for the mission blue on Twin Peaks..
Silver lupine is one of the three native lupine species that provide habitat during different stages of this fascinating butterfly's life. The female butterfly lays eggs on the lupine and feeds on its nectar. When the eggs hatch, the newly emerged caterpillar feeds on the inner parts of the lupine leaves. Once the caterpillar has obtained enough food energy for the winter, it crawls down to the base of the plant and goes dormant. The following spring the caterpillar will emerge to feed again and return to the ground to pupate, emerging from its cocoon as a butterfly. Like many butterfly species, mission blue's larvae have a mutualistic relationship with ants. Caretaker ants stroke the larvae with their antennae, which causes them to secrete a sugary fluid, called honeydew, that the ants crave. In return, the ants protect the larvae from predators and parasites.
The best way to see this landscape is to hike the 0.7 mile trail network that ascend the two peaks, where you will also find 360-degree views that surpass those at the north peak overlook. Additional trails follow the southern and eastern slopes of the park; be sure to stay on established trails to avoid poison oak and minimize erosion. To extend your hike, you can continue down Twin Peaks Blvd towards Portola Drive into Glen Canyon Park for a 1.2 mile Creek to Peaks trail.
Street parking is widely available off of Crestline Drive and there is a small parking lot located near the Christmas Tree Viewing Area. Muni line 37 stops along Crestline Drive and Muni line 48 stops along Portola.