Mount DiabloAbout Mount Diablo
Mount Diablo is a prominent peak in the San Francisco Bay Area located in Contra Costa County, California, with a summit elevation around 1,173 metres (3,849 feet). It sits within Mount Diablo State Park and dominates local skyline views.
The peak has long been a landmark for Indigenous peoples of the region and later for settlers and surveyors; the area around the mountain has been set aside as a state park to conserve its natural and recreational values. Over time roads, trails and park facilities have been added to support public access.
Mount Diablo sits east of the core Bay Area urban corridor in Contra Costa County; the state park spans several thousand hectares of ridgeline and canyon country with access from nearby towns and highways.
- Elevation: Summit elevation is about 1,173 metres (3,849 feet) and the peak is a prominent landmark in the San Francisco Bay Area visible from many surrounding communities.
- Access and viewing times: The summit is accessible by a paved road and multiple trailheads; sunrise and sunset are popular times for panoramic views and photography.
What to See#
- Summit and visitor facilities: The developed summit area inside the state park with parking, a visitor centre and paved viewpoints that provide panoramic views across the Bay Area and Central Valley on clear days.
- Trails and ridgelines: A network of trails and preserved ridgelines within the state park that connect picnic areas, canyons and lookout points used by walkers, cyclists and paragliders.
Best Time to Visit Mount Diablo
Spring and autumn offer the best combination of comfortable weather and visibility; winter brings fewer crowds but variable conditions.
Weather & Climate near Mount Diablo
Mount Diablo's climate is classified as Warm-Summer Mediterranean - Warm-Summer Mediterranean climate with warm summers (peaking in August) and cold winters (coldest in January). Temperatures range from 3°C to 29°C. Abundant rainfall (1181 mm/year), wettest in January with a pronounced dry season.
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | - | 3° - 11° | 5° | 238 mm | - | - | 2.7 m/s | - | - |
| February | - | 4° - 12° | 6° | 189 mm | - | - | 3.0 m/s | - | - |
| March | - | 3° - 12° | 6° | 173 mm | - | - | 3.0 m/s | - | - |
| April | - | 5° - 16° | 10° | 83 mm | - | - | 3.3 m/s | - | - |
| May | - | 7° - 19° | 13° | 22 mm | - | - | 3.3 m/s | - | - |
| June | - | 11° - 24° | 17° | 8 mm | - | - | 3.4 m/s | - | - |
| July | - | 14° - 28° | 21° | 3 mm | - | - | 3.1 m/s | - | - |
| August | - | 16° - 29° | 23° | 6 mm | - | - | 3.1 m/s | - | - |
| September | - | 14° - 27° | 20° | 18 mm | - | - | 2.8 m/s | - | - |
| October | - | 11° - 23° | 17° | 66 mm | - | - | 2.5 m/s | - | - |
| November | - | 6° - 16° | 11° | 176 mm | - | - | 2.6 m/s | - | - |
| December | - | 4° - 12° | 6° | 199 mm | - | - | 2.6 m/s | - | - |
How to Get to Mount Diablo
From San Francisco or Oakland, take I-680 or I-24 toward Walnut Creek/Clayton and follow signs to Mount Diablo State Park. Public transit to nearby towns is possible but driving is the most direct way to reach trailheads and the summit road.
Tips for Visiting Mount Diablo
- Drive up the north gate (Mitchell Canyon Road) for a gentler ascent; the summit road can be steep and winding.
- On clear days the summit panorama includes the San Francisco skyline and Sierra Nevada; sunrise and sunset are especially rewarding.
- Bring layers even on warm days - summit temperatures can be much cooler and windy.