Almanac note · History and culture
Sonoma Plaza holds mission, Vallejo, and Bear Flag history
Sonoma Plaza was laid out in 1835, became a National Historic Landmark, and sits beside sites tied to Vallejo and the Bear Flag revolt.
Sonoma Plaza is one of those places where a lot of California history sits close together. General Mariano Vallejo laid out the eight-acre plaza in 1835, and it is the largest plaza of its kind in California.
The square also became a National Historic Landmark in 1961. City Hall sits in the middle, and its 1908 design has four matching sides. That way, merchants on any side of the Plaza could say City Hall faced them.
The heavier history is nearby, too. Sonoma Barracks was built in 1836 and later became headquarters for the Bear Flag Party. In June 1846, the Bear Flag was raised on Sonoma’s Plaza during the short-lived California Republic moment. Twenty-three days later, the United States took possession of California.
That is a lot for one walk. The Plaza is still a place for markets, events, playgrounds, and shade, but it also holds mission-era, Mexican-era, Bear Flag, and early statehood layers in a very small area.
Where to see it
Sonoma Plaza, Sonoma City Hall, Mission San Francisco Solano, and Sonoma Barracks.
Official sources
Official source trail
Reviewed July 2, 2026
California Porch explains the path. The official source is still the place to confirm the current rule, fee, form, map, deadline, or office decision.
Use the official page before you spend money, file paperwork, rely on a deadline, or change a property.
Connected places
Where it fits on the map
Open a place page for the county layer, nearby places, and other California entries tied to that local page.
Related notes
Keep following this thread.
These are picked from nearby places, shared tags, and the same California topic shelf.
Santa Rosa is home to a statewide California Indian cultural center
The California Indian Museum and Cultural Center in Santa Rosa shares California Indian history, culture, leadership, and living knowledge from a Native-led home base.
Read next →Santa Rosa is where Peanuts found a long home
Charles M. Schulz lived in Santa Rosa for decades, and the museum there keeps Peanuts tied to the city where much of his later life and work took shape.
Read next →Windsor's name story starts with a green valley
Windsor's town history starts with a valley of oak trees and tall grass, long before the modern Town Green became its civic center.
Read next →