Mount Diablo via North Gate and Summit Roads

This route is considered one of the most difficult bike climbs in the Bay Area, demanding a steady effort with few recovery opportunities. The climb is continuous, featuring varied and steep grades, especially in the final 4.5 miles on Summit Road, where average grades are 7% to 9%. The last 0.2 miles to the summit parking lot are particularly brutal, with grades between 15% and 17%, and a 23% finish.

The route is primarily a paved, moderately narrow mountain road. While generally pristine, cyclists should be mindful of occasional potholes, gravel, and wildlife. The ascent is continuous, with only a couple of negligibly short downhill or flat segments, making it a constant climb.

As you climb, you'll pass through ranch buildings and pastures, with increasingly spectacular vistas. Key highlights include the Livermore Valley Overlook and Diablo Valley Overlook. From the Mount Diablo Summit, you can enjoy panoramic 360-degree views that, on a clear day, can extend up to 200 miles, encompassing the Bay Area, Central Valley, Yosemite, and even the snowcapped Sierra Nevada.

While the route can be enjoyed year-round, spring offers the chance to see wildflowers. Weekdays are generally recommended if you prefer fewer cars on the road. Be prepared for potential wind and cooler temperatures at the summit, regardless of the season, so bringing layers is advisable.

The North Gate entrance to Mount Diablo State Park is a common starting point. While specific parking details aren't provided, cyclists typically begin their ascent from the base of North Gate Road. Cyclists are exempt from park entrance fees.

No, cyclists are exempt from paying the park entrance fees when accessing Mount Diablo State Park. You do not need a special permit for this cycling route.

Yes, the Diablo State Park Ranger station (also known as Junction Ranger Station) is a popular spot where North and South Gate Roads meet Summit Road. It's an excellent place to regroup, refill water bottles, and take a break before the final push to the summit. There's also a water spigot available.

Given the continuous ascent and potential for varied weather, it's crucial to bring plenty of hydration, as much of the route is exposed to the sun. Layers are highly recommended due to potential wind and significantly cooler temperatures at the Mount Diablo Summit.

While Mount Diablo State Park has specific rules regarding dogs on trails, this particular route is a challenging paved road primarily used by touring cyclists. Dogs are generally not recommended or suitable for this type of strenuous road cycling ascent.

Yes, the route also passes through sections of the ADT - California - T - Seg 7, Mokelumne Coast to Crest Trail, Camel Rock Trail, Juniper Trail, and Diablo Ranch Trail.

For an average touring cyclist, the route is estimated to take around 2 hours and 6 minutes to complete the 16.8 km ascent. However, given its 'difficult' rating and significant elevation gain, individual times will vary based on fitness levels.