Indigenous in Simi Valley Ventura County was historically inhabited by the
Chumash people, who also settled much of
Santa Barbara and
San Luis Obispo Counties, with their presence dating back 10,000–12,000 years. The Chumash were
hunter-gatherers, fishermen, and also traders with the
Mojave,
Yokuts, and
Tongva Indians. The Chumash are also known for their rock paintings and for their great basketry. Chumash Indian Museum in Thousand Oaks has several reconstructed Chumash houses ('apa) and there are several Chumash pictographs in the county, including the
Burro Flats Painted Cave in Simi Valley. The plank canoe, called a
tomol in
Chumash, was important to their way of life. Canoe launching points on the mainland for trade with the Chumash of the Channel Islands were located at the mouth of the
Ventura River,
Mugu Lagoon and Point Hueneme. This has led to speculations among archeologists of whether the Chumash could have had a pre-historic contact with
Polynesians. According to
diachronic linguistics, certain words such as tomolo'o (canoe) could be related to
Polynesian languages. The dialect of the Chumash language that was spoken in Ventura County was
Ventureño. Several place names in the county have originated from Chumash, including
Ojai, which means moon, and Simi Valley, which originates from the word Shimiyi and refers to the stringy, thread-like clouds that typify the region. Others include
Point Mugu from the word Muwu (meaning "beach"),
Saticoy from the word Sa'aqtiko'y (meaning "sheltered for the wind"), and
Sespe Creek from the word S'eqp'e (meaning "kneecap").
Spanish period is a Spanish mission founded in 1782 by the
Franciscan order. In October 1542, the expedition led by
Juan Rodríguez Cabrillo anchored in an inlet near
Point Mugu; its members were the first Europeans to arrive in the area that would become Ventura County. Active occupation of California by Spain began in 1769.
Gaspar de Portolà led a military expedition by land from
San Diego to
Monterey, passing through Ventura County in August of that year. A priest with the expedition, Father
Juan Crespí, kept a journal of the trip and noted that the area was ideal for a mission to be established and it was a "good site to which nothing is lacking". Also on this expedition was Father
Junípero Serra, who later founded a mission on this site. On March 31, 1782, the
Mission San Buenaventura was founded by Father Serra. It is named after
Saint Bonaventure, one of the early intellectual founders of the
Franciscan order. The town that grew up around the mission was originally named San Buenaventura (and retains the name officially), it has been known as Ventura since 1891. In the 1790s, the
Spanish Governor of California began granting land concessions to Spanish Californians who were often retiring soldiers. These concessions were known as
ranchos and consisted of thousands of acres of land that were used primarily as ranch land for livestock. In Ventura County,
Rancho Simi was granted in 1795 and
Rancho El Conejo in 1802. Fernando Tico was granted Ojai and part of Ventura by Gov. Alvarado.
Mexican period elder and master builder
Fernando Librado, or Kitsepawit, was born at
Mission San Buenaventura during the Mexican period. In 1822, California was notified of Mexico's
independence from Spain and the
Governor of California, the Junta, the military in Monterey and the priests and
neophytes at Mission San Buenaventura swore allegiance to Mexico on April 11, 1822. California land that had been vested in the King of Spain was now owned by the nation of Mexico. By the 1830s, Mission San Buenaventura was in a decline with fewer neophytes joining the mission. The number of cattle owned by the mission dropped from first to fifteenth ranking in the California Missions. The missions
were secularized by the Mexican government in 1834. The
Mexican governors began granting land rights to Mexican Californians, often retiring soldiers. By 1846, there were 19 rancho grants in Ventura County. In 1836, Mission San Buenaventura was transferred from the Church to a secular administrator. The natives who had been working at the mission gradually left to work on the ranchos. By 1839, only 300 Indians were left at the Mission and it slipped into neglect. Several outhouses dating back to the 1800s were discovered in July 2007, at a site that had been cleared to prepare for development. The area proved to be a treasure trove for archaeologists who braved the lingering smell in the dirt to uncover artifacts that showed heavy utilization by mission inhabitants, Indians, early settlers and Spanish and Mexican soldiers.
American period The
Mexican–American War began in 1846 but its effect was not felt in Ventura County until 1847. In January of that year, Captain
John C. Frémont led the California Battalion into San Buenaventura to find that the Europeans had fled, leaving only Native Americans in the Mission. Fremont and the Battalion continued south to sign the
Treaty of Cahuenga with General
Andrés Pico. The
Treaty of Guadalupe Hidalgo formally transferred California to the United States in 1848. By 1849, a constitution had been adopted for the California territory. The new Legislature met and divided the pending state into 27 counties. At the time, the area that would become Ventura County was the southern part of
Santa Barbara County. The 1860s brought many changes to the area. A drought caused many of the ranchos to experience financial difficulties and most were divided, sub-divided and sold. Large sections of land were bought by eastern capitalists based on favorable reports of petroleum deposits. A United States Post Office was opened at Mission San Buenaventura in 1861. On April 1, 1866, the town of San Buenaventura was incorporated, becoming the first officially recognized town in what would become Ventura County. On January 1, 1873, Ventura County was officially split from Santa Barbara County, bringing a flurry of change. That same year, a courthouse and wharf were built in San Buenaventura. A bank was opened and the first public library was created. The school system grew, with the first high school opening in 1890. Other towns were being established in the county. A plan for
Hueneme (later Port Hueneme) was recorded in 1874, and
Santa Paula's plan was recorded in 1875. Along the banks of the Santa Clara River, the township of New Jerusalem (which would eventually be named
El Rio) was founded in 1875 by the owner of general store named Simon Cohen who became its first postmaster and banker in 1882. The community of Nordhoff (later renamed
Ojai) was started in 1874.
Bardsdale,
Fillmore,
Piru, and
Montalvo were established in 1887. 1892 saw
Simi (later Simi Valley),
Somis,
Saticoy, and
Moorpark. Oxnard was a latecomer, not being established until 1898. The
Southern Pacific Railroad laid tracks through San Buenaventura in 1887. For convenience in printing their timetables, Southern Pacific shortened San Buenaventura to Ventura. The Post Office soon followed suit. While the city remains officially known as San Buenaventura, it is more commonly referred to as Ventura. The rail line to
Northern California originally went through
Saugus, Fillmore and Santa Paula, providing a boom to those communities along the line. In 1905, Tunnel #26 was completed between
Chatsworth and
Corriganville near Simi Valley, shortening the rail route. At a length of , Tunnel #26 was the longest tunnel ever constructed in its day. This tunnel joined to the railroad spur coming the other direction from
Montalvo through Camarillo, Moorpark and Simi Valley, making the
contemporary main line used today. One stop along the way, at a 90-degree turn, was at a
sugar beet processing factory. The factory bore the name of its absentee owners, the Oxnard Brothers. A small community of farm and factory workers grew near the train stop. That community, now bearing the name of the factory shortened to the one word train stop Oxnard, has become the largest city in Ventura County. Oil has been known in Ventura County since before the arrival of the Europeans, as the native Chumash people used tar from natural seeps as a sealant and waterproofing for baskets and canoes. In the 1860s, several attempts were made to harvest the petroleum products under Ventura County but none were financially successful, and the oil speculators eventually changed from oil to land development. In 1913,
oil exploration began in earnest, with Ralph Lloyd obtaining the financial support of veteran oil man Joseph B. Dabney. Their first well, named "Lloyd No. 1", was started on January 20, 1914. The well struck oil at but was destroyed when it went wild. Other wells met a similar fate, until 1916, when a deal was struck with the
Shell Oil Company. 1916 was the year that the large
South Mountain Oil Field was discovered; other deals followed with
General Petroleum in 1917 and
Associated Oil Company in 1920. At its peak, the largest oil field in the county, the
Ventura Avenue oilfield, discovered in 1919 in the hills north of Ventura, was producing of oil a day, with annual production of over 1.5million barrels. More oil fields came online in the 1920s and 1930s, with the
Rincon field, the second largest, in 1927, and the adjacent
San Miguelito in 1931. In the early hours of the morning of March 12–13, 1928, the
St. Francis Dam collapsed, sending nearly of water rushing through the Santa Clarita Valley killing as many as 600 people, destroying 1,240 homes and flooding of land, devastating farm fields and orchards. This was the single largest disaster to strike Ventura County and the second largest, in terms of lives lost, in the state.
Modern period Ventura County can be separated into two major parts, East County and West County, which are divided by the
Conejo Grade. East County consists of all cities east of the Conejo Grade. Geographically East County is the end of the
Santa Monica Mountains, in which the
Conejo Valley is located, and where there is a considerable increase in elevation. Communities which are considered to be in the East County are
Thousand Oaks,
Newbury Park,
Lake Sherwood,
Hidden Valley, Santa Rosa Valley, part of Westlake Village,
Oak Park, Moorpark, and Simi Valley. A majority of these communities are in the Conejo Valley. West County, which is everything west of the Conejo Grade, consists of communities such as
Camarillo, Oxnard, Somis, Point Mugu, Port Hueneme, Ventura, Ojai, Santa Paula, and Fillmore. West County consists of some of the first developed cities in the county. The largest beach communities are located in West County on the coastline of the
Channel Islands Harbor. Starting in the mid-20th century, there was a large growth in population in the East County, moving from the
San Fernando Valley in Los Angeles and out into the Conejo and Simi Valleys. Part of the
Conejo Valley is situated in
Los Angeles County. This part consists of
Calabasas,
Hidden Hills,
Agoura Hills,
Agoura, and
Westlake Village. The other half of the Conejo Valley, which belongs to Ventura County, consists of
Lake Sherwood,
Hidden Valley,
Oak Park,
Thousand Oaks, and
Newbury Park, which was formerly an unincorporated area that is now the most westerly part of Thousand Oaks. Many working-class people migrated to this area during the 1960s and 1970s out of
East and
Central Los Angeles. As a result, there was a large growth in population into the Conejo Valley and into Ventura County through the
U.S. Route 101 corridor. Making the U.S. 101 a full freeway in the 1960s, and the expansions that followed, helped make commuting to Los Angeles easier and opened the way for development westward. The communities that have seen the most substantial development are Calabasas, Hidden Hills, Agoura Hills, Westlake Village, Thousand Oaks, and Newbury Park. The neighboring East County area of
Simi Valley saw its already considerable population of nearly 60,000 inhabitants in 1970 grow to over 100,000 over the following two decades. Development moved farther down the
U.S. 101 corridor and sent population rising in West County cities as well. The largest population growth there has been in Camarillo, Oxnard, and Ventura. Development in the East County and along the US 101 corridor is rare today, because most of these cities, such as Thousand Oaks and Simi Valley, are approaching build-out. Although the area still has plenty of open space and land, almost all of it is in greenbelts between the cities. Because of this, its private low-key location, its country feel, and its proximity to Los Angeles, the Conejo Valley area has become a very attractive place to live. Like most areas of Ventura County, it once had relatively inexpensive real estate, but prices have risen sharply. For example, real estate in Newbury Park has increased in price by more than 250% in the last 10 years.
Thomas Fire The Thomas Fire was a massive
wildfire that affected Ventura and
Santa Barbara Counties, and one of
multiple wildfires that ignited in
Southern California in December 2017. It burned approximately , becoming the largest
wildfire in modern California history, before it was fully contained on January 12, 2018. The Thomas Fire destroyed at least 1,063 structures, while damaging 280 others; and the fire caused over $2.176 billion (2018 USD) in damages, The agriculture industry suffered at least $171 million in losses due to the Thomas Fire.
Southern California Edison paid the county over $11 million in claims related to damages and costs since its equipment was likely associated with one ignition point of the fire near Santa Paula. ==Geography==