Neighborhood guide · Simi Valley, CA 93063

Silverthorne

Silverthorne is a hillside neighborhood of about 250 single-family homes at the top of Yosemite Avenue in northeast Simi Valley, laid out along Evening Sky Drive. Its four tract maps were filed as Tract 4998 by landowner Rancho Cortijo 250, LLC and recorded in 1997 and 1998. The houses went up in two phases in the late 1990s and early 2000s.

Updated · Sources at the bottom of the page · Corrections: send a correction

At a glance

Silverthorne quick facts

WhereNortheast Simi Valley, at the top of Yosemite Avenue along Evening Sky Drive, with Chumash Park to the southeast and the Santa Susana Mountains foothills to the north
City / jurisdictionCity of Simi Valley · ZIP 93063
BuiltLate 1990s to early 2000s (tract maps recorded 1997 and 1998)
BuildersRancho Cortijo 250, LLC (landowner of record on the tract maps)
HomesAbout 250 (121 in Silverthorne I, 129 in Silverthorne II)
Home typesSingle-family detached homes, mostly about 3,000 to 4,300 sq ft
GatesNot gated
HOASilverthorne Owners Association — Covers the 121 homes of the first phase (Tract 4998 units 1 to 3). A second association, Silverthorne II Owners Association, covers the 129 homes of unit 4. Both are listed as managed by GM Management.
Tracts2 named tracts and sub-neighborhoods (list)
Parks nearbyLas Llajas Canyon Trail, North Ridge Trail, Chumash Park
School districtSimi Valley Unified School District

Pins are approximate centers. Outlines are recorded tract maps from county GIS; tap one for its guide.

About

Living in Silverthorne

Two homeowners associations split the neighborhood. Silverthorne Owners Association covers the 121 homes of the western phase, which is Tract 4998 units 1 through 3, recorded in August 1997. Its streets include Bluebird Circle, Falling Water Court, Moonshadow Street, Rising Star Avenue and Sunlight Street. Silverthorne II Owners Association covers the 129 homes of unit 4, recorded in June 1998. That phase takes in the eastern stretch of Evening Sky Drive, Mustang Drive, Cherokee Circle and Painted Pony Circle. Both associations are listed as managed by GM Management.

County assessor records put most houses between about 3,000 and 4,300 square feet, on lots a little over a quarter acre. The tract maps dedicated the streets to the city as public roads. Evening Sky Drive is a trailhead for the Las Llajas Canyon Trail, which links to the Rocky Peak Trail, and for the North Ridge Trail. The geologic report cited on the maps refers to the property as Marr Ranch.

The lay of the land

Hillside streets of large single-family homes, with the Las Llajas Canyon and North Ridge trailheads on Evening Sky Drive

The recorded tract maps name the landowner, Rancho Cortijo 250, LLC, but not the company that built the houses. On the first map, recorded in 1997, the landowner signed through its executive manager, ORA California I, LLC (managed by Olympic Realty Advisors, LLC), and its operating manager, Marr Ranch I, LLC (managed by RBF Associates, Inc.).

Inside the neighborhood

Tracts & sub-neighborhoods of Silverthorne

The named tracts, villages and gated enclaves residents, HOAs and the MLS use inside the neighborhood, each with its own page.

Missing a tract? Tell us its name and we'll research it.

Schools

Schools near Silverthorne

School attendance areas

Simi Valley Unified School District
On SVUSD's attendance-boundary map (elementary map revised December 2023), the recorded tract outlines in this guide fall in:

  • Elementary: Big Springs Elementary School (1 tract); 1 tract spans more than one area
  • Middle: Valley View Middle School (1 tract); 1 tract spans more than one area
  • High: Simi Valley High School (all 2 tracts)

These come from the district's own data, not from this site; each tract page has its own answer. Assignment goes by address. Confirm with School Boundary Maps, or check an address here.

Public schools nearby

  • Big Springs Elementary School (3401 Big Springs Ave.)
  • Valley View Middle School (3347 Tapo St.)
  • Simi Valley High School (5400 Cochran St.)

Being nearby doesn't mean a school is assigned. Attendance goes by address and boundaries change; confirm with the district.

Living here

Services, representation & fire safety

These are Simi Valley's area-wide providers; some vary by street.

PoliceSimi Valley Police Department
(805) 583-6950 · 3901 Alamo St. Patrols the city. The unincorporated Knolls, Box Canyon, Lake Manor and Sinaloa Lake areas are served by the Ventura County Sheriff's Office.
Fire and paramedicVentura County Fire Department
Covers the city and surrounding county land. Simi Valley stations: 41 (1910 Church St.), 43 (5874 E. Los Angeles Ave.), 44 Wood Ranch (1050 Country Club Dr.), 45 West Simi (790 Pacific Ave.), 46 Tapo (3265 Tapo St.) and 47 Big Sky (2901 Erringer Rd.).
WaterVentura County Waterworks District No. 8 (managed by the City of Simi Valley)
(805) 583-6736 · Serves about 60 percent of the city, with the City Council sitting as its board. Most of its water is imported through Calleguas Municipal Water District, supplemented by two district wells in Tapo Canyon. After-hours emergencies: (805) 504-2708.
WaterGolden State Water Company
Private utility serving the other 40 percent or so of the city. Your bill, or the district's service-area map, shows which supplier serves your address.
SewerCity of Simi Valley Public Works, Sanitation Services
Runs the city sewer system and its Water Quality Control Plant.
ElectricitySouthern California Edison (delivery) and Clean Power Alliance (default power supply)
SCE owns the lines and handles outages. Simi Valley joined Clean Power Alliance in 2019, and its default plan is Lean Power; customers can change plans or opt back to SCE supply.
GasSouthern California Gas Company (SoCalGas)
Trash and recyclingWaste Management (G.I. Industries)
(805) 522-9400 · The city's exclusive franchise hauler under an agreement executed October 10, 2022, covering trash, recycling, green and food waste, bulky-item pickup and outreach. The City Council sets rates each year, and collected waste goes to the Simi Valley Landfill and Recycling Center. Unincorporated areas are outside the city franchise; check with the County of Ventura.
Parks and recreationRancho Simi Recreation and Park District
(805) 584-4400 · 4201 Guardian St. Runs neighborhood and community parks, trails, open space, community centers, the Santa Susana Depot and Strathearn Historical Park.
LibrarySimi Valley Public Library
(805) 526-1735 · 2969 Tapo Canyon Rd., next to City Hall.
Animal servicesVentura County Animal Services
1-888-223-7387 · Serves Simi Valley by contract. The Simi Valley Animal Shelter at 670 W. Los Angeles Ave. handles strays, adoptions, licensing and lost pets; the main shelter is in Camarillo.
TransitSimi Valley Transit
(805) 583-6456 · Routes 10, 20 and 30, Dial-A-Ride and same-day SVT On Demand rides. Route 10 connects with LA Metro buses in Chatsworth, and VCTC Intercity buses stop at Simi Valley Town Center.
HospitalAdventist Health Simi Valley
The city's hospital, with a 24-hour emergency department.
Emergency alertsVC Alert (Ventura County Sheriff's Office of Emergency Services)
Free English and Spanish alerts by phone, text and email for any Ventura County address. Sign up at member.everbridge.net, by email at vc.alert@ventura.org or by phone at 888-772-4482. The county also recommends keeping Wireless Emergency Alerts turned on.
Neighborhood councilsCity of Simi Valley Neighborhood Councils
(805) 583-6756 · Four advisory councils; every resident 18 or older is automatically a member. Each usually meets monthly at 7 p.m. in the City Hall Community Room, 2929 Tapo Canyon Rd.

Who represents you: Mayor Dee Dee Cavanaugh (appointed mayor by the council on January 27, 2025, after Mayor Fred Thomas died in office); Mayor Pro Tem Elaine P. Litster (District 3); Joseph D. Ayala (District 1, appointed February 2025); Mike Judge (District 2); Rocky Rhodes (District 4). · Janice S. Parvin, Ventura County Board of Supervisors District 4, which covers Simi Valley, Moorpark and nearby unincorporated areas including the Knolls, Box Canyon, Bell Canyon and Sinaloa Lake. She won another term outright in the June 2, 2026 primary with about 70 percent of the vote over Ruth Luevanos; the new term begins in January 2027. Office: 980 Enchanted Way #203, Simi Valley, (805) 955-2300. Full list for Simi Valley.

Fire safety: Brush-covered hills ring the city, so neighborhoods along the edges, from Wood Ranch, Long Canyon and Bridle Path in the south to Big Sky, Wild Horse Canyon, Indian Hills and Silverthorne in the north and the Knolls, Box Canyon and Lake Manor in the east, sit… More.

Homes

Homes for sale in and around Silverthorne

Every MLS listing here, with photos, prices and details, is on Properkey.

Real estate →

Browse homes for sale in Simi Valley on Properkey

Real estate information provided by Properkey (CA DRE #01979718 · NMLS #1438783), which is not the listing broker unless stated.

Sources

Where these facts come from

  1. OpenStreetMap: Silverthorne — openstreetmap.org
  2. Ventura County record maps layer: Tract 4998 units 1-4 and recording dates — maps.ventura.org
  3. Ventura County recorded map 131 MR 84 (Tract 4998-1, 1997) — maps.ventura.org
  4. Ventura County recorded map 134 MR 90 (Tract 4998-4, 1998) — maps.ventura.org
  5. Ventura County parcels: Tract 4998 units 1-3 — maps.ventura.org
  6. Ventura County parcels: Tract 4998-4 — maps.ventura.org
  7. Transparency HOA: Silverthorne I (Silverthorne Owners Association) — transparencyhoa.org
  8. Transparency HOA: Silverthorne II Owners Association — transparencyhoa.org
  9. RSRPD trails (Las Llajas Canyon, North Ridge, Chumash) — rsrpd.org
  10. Ventura County points of interest: school locations — maps.ventura.org

Something wrong or missing on this page? Residents know their streets best. Send a correction and we'll check it against the records and fix it.