Santa Monica Mountains

The Santa Monica Mountains is a coastal mountain range in Southern California, paralleling the Pacific Ocean. It is part of the Transverse Ranges.[1] Because of its proximity to densely populated regions, it is one of the most visited natural areas in California. Santa Monica Mountains National Recreation Area is located in this mountain range.

Santa Monica Mountains
Malibu Canyon in the Santa Monica Mountains
Highest point
PeakSandstone Peak
Elevation3,111 ft (948 m)
CountryUnited States
CountiesLos Angeles and Ventura
Range coordinates34°7′13.023″N 118°55′54.348″W
Parent rangeTransverse Ranges
Borders onSanta Susana Mountains, Simi Hills and Verdugo Mountains


The range extends approximately 40 miles (64 km) east-west from the Hollywood Hills in Los Angeles to Point Mugu in Ventura County. The western mountains, separating the Conejo Valley from Malibu, suddenly end at Mugu Peak[2] as the rugged, nearly impassible shoreline gives way to tidal lagoons and coastal sand dunes of the alluvial Oxnard Plain. The mountain range contributed to the isolation of this vast coastal plain before regular transportation routes reached western Ventura County. The eastern mountains form a barrier between the San Fernando Valley and the Los Angeles Basin, separating "the Valley" on the north and west-central Los Angeles on the south. The Santa Monica Mountains are parallel to the Santa Susana Mountains, which are located directly north of the mountains across the San Fernando Valley.

The range is of moderate height, with no particularly craggy or prominent peaks outside the Sandstone Peak and Boney Mountains area. While often rugged and wild, the range hosts a substantial amount of human activity and development. Houses, roads, businesses, and recreational centers are dotted throughout the Santa Monica Mountains.

A number of creeks in the Santa Monica Mountains are part of the Los Angeles River watershed. Beginning at the western end of the San Fernando Valley the river runs to the north of the mountains. After passing between the range and the Verdugo Mountains it flows south around Elysian Park defining the easternmost extent of the mountains.


The Santa Monica Mountains have more than 1,000 archeology sites of significance, primarily from the Californian Native American cultures of the Tongva and Chumash people.[3] The mountains were part of their regional homelands for over eight thousand years before the arrival of the Spanish.[4] The Spanish mission system had a dramatic impact on their culture and by 1831, their population had dropped from over 22,000 to under 3,000.[5]


Geologists consider the northern Channel Islands to be a westward extension of the Santa Monicas into the Pacific Ocean. The range was created by repeated episodes of uplifting and submergence by the Raymond Fault that created complex layers of sedimentary rock. Volcanic intrusions have been exposed, including the poorly named, andesitic,[6] "Sandstone Peak" the highest in the range at 3,111 feet (948 m). Malibu Creek, which eroded its own channel while the mountains were slowly uplifted, bisects the mountain range.


The Santa Monica Mountains have dry summers with frequent coastal fog on the ocean (south) side of the range and wet, cooler winters. In the summer, the climate is quite dry (except for coastal fog), which makes the range prone to wildfires, especially during dry "Santa Ana" wind events. Snow is unusual in the Santa Monica Mountains, since they are not as high as the nearby San Gabriel Mountains. The lower slopes of the range average between 15 to 20 inches of rain per year, while the highest slopes of the central and western Santa Monica Mountains average as much as 27 inches of rain per year. The bulk of the rain falls between November and March. Rainfall is generally higher in the central and western parts of the range. This is reflected in the vegetation. The central and western portions of the range generally support more widespread woodlands (with oak, sycamore, walnut, bay laurel, alder and other trees) than the eastern part of the range, where trees are usually restricted to the stream courses.

On January 17, 2007, an unusually cold storm brought snow in the Santa Monica Mountains. The hills above Malibu picked up three inches (eight centimeters) of snow - the first measurable snow in five decades (50 years). Snow was reported on Boney Peak, in the winter of 2005; and in March 2006, snow also fell on the summit of the mountain. Snow also fell on the peak of Boney Mountain in late December 2008. The latest recorded snowfall in the area was in February 2019 where an unusual amount of snowfall accumulated in low passes in the mountains. The storm system also brought rare snowfall to the Los Angeles area.


Much of the mountains are located within the Santa Monica Mountains National Recreation Area. Preservation of lands within the region are managed by the Santa Monica Mountains Conservancy, the National Park Service, the California State Parks, and County and Municipal agencies. Today, the Santa Monica Mountains face pressure from local populations as a desirable residential area, and in the parks as a recreational retreat and wild place that's increasingly rare in urban Los Angeles. In 2014 the California Coastal Commission and the Los Angeles County Board of Supervisors approved the Santa Monica Mountains Local Coastal Program, a land-use plan that will distinguish between the private lands that need strict protection and property that could be developed in strict conformance with this detailed plan.[10]

Regional parks

Over twenty individual state and municipal parks are in the Santa Monica Mountains, including: Topanga State Park, Leo Carrillo State Park, Malibu Creek State Park, Point Mugu State Park, Will Rogers State Historic Park, Point Dume State Beach, Griffith Park, Marvin Braude Mulholland Gateway Park, Charmlee Wilderness Park,[11] Franklin Canyon Park, Runyon Canyon Park, King Gillette Ranch Park,[12] and Paramount Ranch Park.[13]


The Satwiwa Native American Indian Culture Center in Newbury Park, California is located within the Santa Monica Mountains National Recreation Area. The area was purchased by the U.S. National Park Service in 1980.[14] The Rosewood Trail near Stagecoach Inn, which leads to Angel Vista in the Santa Monica Mountains, is an additional access point in Newbury Park.

Griffith Park

At the eastern end of the Santa Monica Mountains are Griffith Park and lastly Elysian Park. Griffith Park is separated from the rest of the Santa Monica Mountains to the west by the Cahuenga Pass, over which the 101 Freeway (also called the Hollywood Freeway) passes from the San Fernando Valley into Hollywood. Elysian Park is in the easternmost part of the mountains and is bordered by the Los Angeles River to the east and Downtown Los Angeles nearby to the south.

Rim of the Valley Trail

The Rim of the Valley Trail is a plan in progress for accessing and connecting the parkland and recreational areas of the mountains surrounding the Conejo, San Fernando, Simi, and Crescenta Valleys. With trailheads in the mountains and valleys, it would link them via existing and new: walking, hiking, equestrian, and mountain biking trails; parklands; and conservation easements. The Rim of the Valley project also has the goal to protect flora-fauna habitats and wildlife corridors between the Santa Monica Mountains and the inland ranges.[15][16][17][18]

Flora and fauna


The range is host to a variety of wildlife. The mountain lions population is challenged because the Santa Monica Mountains are isolated and not big enough for weaned cubs to find their own territory.[19][20][21][22] The primary cause of the decline is due to a combination of traffic-related mortality,[23][24] anti-coagulants ingested from human poisoned prey, and attacks by other, more dominant mountain lions (an elder male, known as P1, killed both his son and his mate; this is thought to be due to a reduction in available habitat.)[25]

Being struck by vehicles is also a common cause of bobcat fatalities.[26] Their main cause of death is mange, a skin disease often found in animals that have ingested rat poison.[27]

Snakes are common but only occasionally seen: the Southern Pacific rattlesnake (the only venomous species), mountain kingsnake, California kingsnake, gopher snake, and garter snake. The mountains are also home to the western fence lizard and the coastal whiptail. Also the endangered Southern California Distinct Population Segment of steelhead is found here.[28]


The Santa Monica Mountains are in the California chaparral and woodlands ecoregion, and includes the California oak woodland and southern coastal sage scrub plant community, and are covered by hundreds of local plant species, some of which are very rare or endemic, and others which are widespread and have become popular horticultural ornamentals. Dudleya verityi is a rare species of succulent plant known by the common name Verity's liveforever. Endemic to Ventura County, this species is only found on one edge of the Santa Monica Mountains, where it occurs in coastal sage scrub habitat.[29] The most common trees in the mountains are oak and sycamore. The California black walnut, endemic to California, grows on the northern side of the mountains in the Valley and Griffith Park. Other species include willow and alder (along stream courses) and bay laurel. Several species of ferns (including large sword ferns) are found in wetter, shady areas throughout the range, especially near streams.

Invasive species

Many invasive weeds have colonized the mountain habitats which can bring about significant changes in the ecosystems by altering the native plant communities and the processes that support them. These non-native plants include annual Mediterranean grasses, Spanish broom (Genista juncea), and yellow starthistle (Centaurea solstitialis). In creekside riparian habitats are found plants such as giant cane (Arundo donax), German ivy (Delairea odorata), blue periwinkle (Vinca major), and ivy (Hedera spp.).

More frequent fires have created conditions favorable to invasive plants. The 2018 Woolsey fire burned through 88% of the federal parkland.[30] The fire, which was three times larger than the biggest fire ever before in the mountains, burned over 40% of the natural area in the Santa Monicas.[31] The fire created a challenge to native plants as black mustard with bright yellow flowers quickly established itself as a wet winter followed the fire.[32] The mustard plants will also provide fuel for the next fires.[33]

The New Zealand mud snail has infested watersheds in the Santa Monica Mountains, posing serious threats to native species and complicating efforts to improve stream-water quality for the endangered steelhead.[34] Within a period of four years, the snails expanded from their first known population in Medea Creek in Agoura Hills to nearly 30 other stream sites. Researchers at the Santa Monica Bay Restoration Commission believe that the snails' expansion may have been expedited after the mollusks traveled from stream to stream on the gear of contractors and volunteers.[35]

Roads and access

Cahuenga Pass, present-day site of U.S. Route 101, is the easiest pass through the range connecting the Los Angeles Basin to the San Fernando Valley. In the 1800s, two battles were fought there, and the Treaty of Cahuenga was signed nearby. In the heyday of Hollywood, movie studios clustered on both sides of it.

Sepulveda Pass is the main north-south pass to the west, connecting the Westside to Sherman Oaks via the San Diego Freeway (I-405) and Sepulveda Boulevard.

Minor passes between the Sepulveda and Cahuenga passes include Laurel Canyon Boulevard, Coldwater Canyon Avenue, and Beverly Glen Boulevard. Further west of the Sepulveda Pass are Topanga Canyon Boulevard (SR 27), Malibu Canyon Road and Kanan Dume Road.

Mulholland Drive runs much of the length of the Santa Monica Mountains, from Cahuenga Pass to Woodland Hills, although it is not open to motor vehicles west of Encino. The Mulholland Highway runs from Woodland Hills to Sequit Point at the Pacific Ocean.

The eastern end of the range, located in the City of Los Angeles, is more intensively developed than the western end of the range. The city of Malibu runs between the coast and the leading mountain ridge, from Topanga Canyon in the east to Leo Carrillo State Park in the west.

Santa Monica Mountains-area communities

Communities along the north slope of the mountains include (from east to west):

Communities along the south slope of the mountains include (from east to west):

Named peaks

Named peaks in the Santa Monica Mountains
Sandstone Peak[36]3111 ft948 malso known as Mount Allen, rising nearly a kilometer high
Tri-Peaks3010 ft917 m
Exchange Peak2950 ft899 m
Conejo Peak2854 ft870 m
Boney Peak[37]2825 ft861 m
Castro Peak[38]2824 ft861 mhighest peak in the eastern end of the range
Saddle Peak[39]2805 ft855 m
Calabasas Peak[40]2165 ft660 m
Temescal Peak2126 ft648 m
San Vicente Mountain[41]1965 ft599 mformer site of a Nike missile base, now a Cold War park
Clarks Peak[42]1965 ft599 m
Mesa Peak[43]1844 ft562 m
Cahuenga Peak[44]1820 ft555 m
Brents Mountain[45]1713 ft522 m
Mount Lee[46]1640 ft500 mthe Hollywood Sign is on the southern slope, at exactly half a kilometer high
Mount Hollywood[47]1625 ft495 m
Mount Chapel1622 ft494 m
Mount Bell1587 ft484 m
La Jolla Peak[48]1567 ft478 m
Laguna Peak[49]1457 ft444 mthe instrumentation capping this peak serves the military base below
Mugu Peak[2]1266 ft386 mthe westernmost peak in the range, rising directly from the beach

Adjacent ranges

See also


  1. "Santa Monica Mountains". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  2. "Mugu Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  3. Carlson, Cheri (February 8, 2014). "Dozens of archaeological sites discovered in wake of Springs Fire". Ventura County Star. Archived from the original on May 5, 2019.
  4. "Prehistoric milling site found in California" USA Today March 4, 2006
  5. "Chumash History" Santa Ynez Band of Chumash Indians Official Website 2009. Accessed February 13, 2014
  6. Volcanoes - Santa Monica Mountains National Recreation Area. Retrieved on September 18, 2013.
  7. Riedel, Allen (2008). 100 Classic Hikes in Southern California: San Bernardino National Forest, Angeles National Forest, Santa Lucia Mountains, Big Sur, and the Sierras. The Mountaineers Books. Page 118. ISBN 9781594851254.
  8. Riedel, Allen (2011). Best Easy Day Hikes Conejo Valley. Rowman & Littlefield. Page 21. ISBN 9780762765812.
  9. Mallarach, Josep-Maria and Thymio Papayannis (2007). Protected Areas and Spirituality. Island Press. Page 109. ISBN 9782831710235.
  10. Newton, Jim (June 1, 2014) "The promise of a balanced future for the Santa Monica Mountains" Los Angeles Times
  11. Charmlee Wilderness Park
  12. King Gillette Ranch Park Archived October 25, 2010, at the Wayback Machine
  13. Paramount Ranch Park
  14. McKinney, John (1992). Day Hiker’s Guide To Southern California. Olympus Press. Page 92. ISBN 9780934161121.
  15. rimofthevalleytrail-master plan January 6, 2010
  16. www.lamountains
  17. Rim of the Valley Trail-update 6/6/2010
  18. Kamal, Sameea (March 4, 2015). "Three lawmakers urge Park Service action on Rim of the Valley study". Los Angeles Times.
  19. Carlson, Cheri (April 24, 2015). "Young male mountain lion follows sister out of Santa Monica Mountains". Ventura County Star.
  20. Hayes, Rob (September 13, 2019). "SoCal's dwindling mountain lion population sparks concern among wildlife experts |". ABC7. Retrieved September 13, 2019.
  21. Roderick, Kevin (May 5, 2015). "Secrets of the LA mountain lions". LA Observed.
  22. "Behind the scenes with a Los Angeles mountain lion expert". UCLA. May 5, 2015.
  23. Bloom, Tracy (September 4, 2019). "P-65 Becomes 2nd Female Mountain Lion to Cross 101 Freeway During Santa Monica Mountains Study". KTLA. Retrieved September 6, 2019.
  24. Shalby, Colleen; LOZANO, CARLOS (September 7, 2019). "The mountain lion known as P-61 is struck and killed on 405 Freeway". Los Angeles Times. Retrieved September 8, 2019.
  25. "Simi Valley Man Charged After Allegedly Fatally Shooting Mountain Lion P-38 in the Head". KTLA. September 11, 2019. Retrieved September 11, 2019.
  26. McGough, Michael (August 8, 2019). "Car-on-animal crashes cost Californians millions. New research lists roadkill 'hot spots'". Sacramento Bee. Retrieved August 11, 2019.
  27. Shalby, Colleen (May 21, 2018). "Cars are killing bobcats at an alarming rate in Southern California, biologists say". Los Angeles Times. Retrieved May 22, 2019.
  28. "South-Central/Southern California Coast Steelhead Recovery Planning Domain 5-Year Review: Summary and Evaluation of Southern California Coast Steelhead Distinct Population Segment" (PDF). National Oceanic and Atmospheric Administration. 2011. Retrieved December 3, 2013.
  29. Carlson, Cheri (September 29, 2013). "Scientists keep eye on rare plant burned in Springs Fire]". Ventura County Star. Archived from the original on August 9, 2014.
  30. Wallack, Roy (April 19, 2019). "Hiking in the Woolsey fire's burn area: See photos of nature's remarkable comeback". Los Angeles Times. Retrieved April 22, 2019.
  31. Simon, Scott (May 5, 2019). "How Last Year's Massive Woolsey Fire In Southern California Impacted Wildlife". NPR News, Weekend Edition. Retrieved May 5, 2019.
  32. Orozco, Lance (April 19, 2019). "They Look Pretty, But The Yellow-Green Plants On Central And South Coast Hills Are Invasive Weeds". KCLU News. Retrieved April 23, 2019.
  33. Panzar, Javier. "This super bloom is pretty dangerous: Invasive mustard is fuel for the next fire". Los Angeles Times. Retrieved April 25, 2019.
  34. "Exotic Animals - Santa Monica Mountains National Recreation Area (U.S. National Park Service)". Retrieved July 21, 2018.
  35. Leovy, Jill (March 30, 2010). "Hard-to-kill snails infest Santa Monica Mountain watersheds". Los Angeles Times. Retrieved July 20, 2018.
  36. "Sandstone Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  37. "Boney Mountain". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  38. "Castro Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  39. "Saddle Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  40. "Calabasas Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  41. "San Vicente Mountain". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  42. "Clarks Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  43. "Mesa Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  44. "Cahuenga Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  45. "Brents Mountain". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  46. "Mount Lee". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  47. "Mount Hollywood". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  48. "La Jolla Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
  49. "Laguna Peak". Geographic Names Information System. United States Geological Survey. Retrieved May 3, 2009.
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