SOUTH BAY · REGION GUIDE

Discovering the South Bay — Start Here

The South Bay is the Santa Clara Valley — a wide, flat valley floor ringed by the Santa Cruz Mountains to the west and the Diablo Range to the east, filled in over the past seventy years with the cities that became Silicon Valley.

At a glance

  • Where it is: Santa Clara County, from the Palo Alto boundary south through San Jose to Gilroy.
  • The shape: a broad valley floor with foothill cities on both edges and a narrowing southern end.
  • The anchors: employment centers concentrated in the northern and western valley; San Jose sits at the center as the county seat.
  • What makes it different: the valley is large enough that neighborhoods, not city names, determine most of what daily life feels like.

Housing character

  • Valley floor cities — Sunnyvale, Santa Clara, Milpitas, much of San Jose — are mostly post-war tract housing with growing supplies of newer townhomes and condominiums.
  • Foothill cities — Los Altos, Saratoga, Los Gatos, parts of Cupertino — generally have larger lots and more custom homes.
  • Downtown San Jose includes high-rise condominium buildings.
  • The southern valley — Morgan Hill and Gilroy — has newer housing and more land, in exchange for a longer commute north.

Around town

  • Most cities have a compact historic downtown — Murphy Avenue in Sunnyvale, Campbell Avenue, Santa Cruz Avenue in Los Gatos — surrounded by suburban neighborhoods.
  • Both mountain ranges are within reach for hiking, and a chain of county parks runs along each side of the valley.
  • Summers run warmer and drier than the Peninsula or the bayside East Bay, with less fog.

Getting around

  • Caltrain runs along the western side of the valley through Mountain View, Sunnyvale, Santa Clara, and San Jose, continuing south to Gilroy with limited service.
  • VTA light rail connects downtown San Jose to north San Jose, Mountain View, Campbell, and south San Jose.
  • BART now reaches Milpitas and Berryessa/North San José, with further extension into downtown San Jose planned — check current status.
  • Highways US-101, I-280, I-680, I-880, SR-87, SR-85, and SR-17 form the valley's road grid, along with a system of expressways.
  • ACE and Capitol Corridor trains serve Diridon Station in San Jose.

What to check

  • School district boundaries are unusually fragmented here, particularly in Sunnyvale, Santa Clara, and San Jose — always confirm by exact address.
  • Freeway and expressway noise varies sharply from block to block.
  • Aircraft approach paths to San Jose Mineta International Airport affect parts of the central and northern valley.
  • Commute times vary enormously depending on which end of the valley you live and work in.
  • Verify current transportation service, school assignment, permit requirements, hazard information, and total housing costs for the specific address.

Nearby guides

San JoseNorthern California's largest city — better understood as dozens of distinct neighborhoods than as one market.SunnyvaleCentral South Bay city with varied housing types and a downtown district next to Caltrain.Santa ClaraFlat, central valley city with a university, Levi's Stadium, a city-owned electric utility, and a wide housing mix.Los GatosWhere the valley meets the mountains — a walkable downtown, hillside homes, and SR-17 at the doorstep.