1921
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- San Jose engineer Charles Herrold, after experimenting with radio broadcasting since 1909, receives a commercial license under the callsign KQW
- KLX, owned by Oakland Tribune publisher Joseph R. Knowland, begins broadcasting out of Oakland
- San Jose Junior College is established
- The original Stanford Stadium (pictured) is completed on the Stanford University campus, as the home of the Stanford Cardinal football team
- The University of California Museum of Paleontology opens at the University of California, Berkeley, to hold fossils gathered during the 1860-1867 California Geological Survey
- The USS Conestoga (pictured) goes missing after leaving Mare Island