Sierra Azul Open Space Preserve is a vast open space preserve spanning over 19,000 acres in the Santa Cruz Mountains. Its rugged and steep terrain features diverse habitats, including serpentine grasslands, oak woodlands, and riparian corridors, providing varied landscapes for outdoor pursuits. The preserve encompasses prominent peaks like Mount Umunhum, offering extensive views and challenging ascents. This expansive area is suitable for several sports like hiking, jogging, gravel biking, road cycling, and more.
144
Routes
4.7
(129)
Average rating
2743
People visited

4.8
(5)
35
hikers
7.72km
02:17
240m
180m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

5.0
(1)
21
hikers
9.22km
02:52
360m
340m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

5.0
(1)
13
hikers
14.2km
04:19
460m
460m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

5.0
(1)
11
hikers
6.56km
01:51
20m
370m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
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4.3
(13)
175
riders
26.9km
01:35
100m
100m
Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.

5.0
(1)
47
riders
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

42
riders
41.9km
03:18
1,100m
1,100m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

5.0
(1)
38
riders
30.7km
02:51
810m
810m
Hard bike ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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4.7
(3)
133
riders
101km
05:21
1,590m
1,590m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.

5.0
(2)
91
riders
40.2km
02:42
1,090m
1,090m
Hard road ride. Very good fitness required. Mostly well-paved surfaces and easy to ride.

33
riders
Hard road ride. Very good fitness required. Some segments of this route may be unpaved and difficult to ride.

34
riders
26.6km
01:40
530m
530m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
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5.0
(2)
26
riders
22.3km
02:22
680m
680m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

4.7
(13)
77
riders
23.4km
02:16
590m
590m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

5.0
(1)
42
riders
33.6km
03:13
970m
970m
Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.

5.0
(1)
34
riders
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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5.0
(1)
16
riders
57.4km
06:24
1,350m
1,350m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

1
riders
16.6km
01:51
420m
430m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

36.7km
03:44
740m
740m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

5.0
(1)
26
riders
45.2km
03:26
440m
440m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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10
runners
5.16km
00:39
180m
180m
Moderate run. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

7
runners
19.1km
02:25
770m
770m
Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

7
runners
12.3km
01:51
600m
600m
Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

6
runners
4.97km
00:31
30m
30m
Easy run. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
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Sierra Azul Open Space Preserve offers a variety of outdoor activities, including Hiking, Jogging, Gravel biking, Road cycling, Touring cycling, and Mountain biking. The preserve features approximately 26 miles of multi-use trails suitable for different skill levels. It is the largest preserve managed by the Midpeninsula Regional Open Space District.
Notable hiking trails include the Mount Umunhum Trail, a 3.9-mile (6.3 km) route to the summit, and the Woods Trail, a 6.2-mile (10 km) journey to Mount El Sombroso. Other popular options are Kennedy Trail, Priest Rock Trail, and Bald Mountain Trail. More details can be found in the Hiking in Sierra Azul Open Space Preserve guide.
The preserve offers trails suitable for various fitness levels, including accessible paths that can be enjoyed by families. These routes wind through diverse habitats, providing engaging scenery. For specific routes, consult the Family-friendly hikes in Sierra Azul Open Space Preserve guide.
Many of the multi-use trails within Sierra Azul Open Space Preserve accommodate dog walkers. Visitors should check specific trail regulations regarding leash requirements and restricted areas. Information on suitable routes is available in the Dog-friendly hikes in Sierra Azul Open Space Preserve guide.
Mount Umunhum, standing at 3,486 feet (1,063 meters), is a prominent feature offering panoramic views and housing a former Cold War-era radar station. The preserve also features diverse habitats like serpentine grasslands, oak woodlands, and riparian corridors. Los Gatos Creek and Guadalupe Creek are significant waterways within the preserve.
Gravel biking is popular on multi-use trails and old roads like Los Gatos Creek Trail, Limekiln, and Barlow Road. Road cyclists can find challenging routes with significant elevation changes, such as the Mount Umunhum Road loop. Explore more options in the Cycling in Sierra Azul Open Space Preserve guide.
Yes, Sierra Azul Open Space Preserve includes easy, accessible paths suitable for beginners and those seeking less strenuous activities. These trails offer a way to experience the preserve's natural beauty without significant elevation gains. Refer to the Easy hikes in Sierra Azul Open Space Preserve guide for specific routes.
Sierra Azul Open Space Preserve is a popular destination, with more than 35,000 visitors sharing their experiences on komoot. The preserve's 26 routes have an average rating of 4.61 out of 5 stars. This indicates a high level of satisfaction among outdoor enthusiasts.
The official website for Sierra Azul Open Space Preserve, managed by the Midpeninsula Regional Open Space District, is openspace.org/preserves/sierra-azul. This site provides detailed information regarding preserve rules, access, and current conditions.
The preserve is characterized by rugged and steep terrain, with trails ranging from accessible paths to routes with significant elevation gains. Peaks like Mount Umunhum (3,486 feet / 1,063 meters) and El Sombroso (2,999 feet / 914 meters) contribute to the challenging ascents. The varied landscape includes serpentine grasslands, chaparral, and oak woodlands.
Yes, komoot offers a dedicated guide for running enthusiasts. This resource provides information on suitable routes and conditions for jogging within the preserve. Consult the Running Trails in Sierra Azul Open Space Preserve guide for detailed planning.
The general contact phone number for the Midpeninsula Regional Open Space District, which manages Sierra Azul Open Space Preserve, is 650-691-1200. This number can be used for inquiries regarding the preserve.

