Reported Crop Circles for the State of California -

San Francisco, San Francisco County (1992)

Three concentric rings; no further details known.

Crop type: unknown

Source: Jeffrey Wilson
 

City / County / Date:

• Mt. Palomar Observatory, Palomar Mountain, Cleveland National Forest, San Diego County, CA (Summer 1955)
• Lemon Grove, San Diego County (November 16, 1973)
• Point Dume State Preserve, Malibu, Los Angeles County (1973)
• [Unknown] (somewhere north of Los Angeles) (1975)
• Lake Port, Lake County (1976)
• San Francisco, San Francisco County (1992)
• [Unknown], (July, 1993)
• Lompoc, Santa Barbara County (August 28, 1994)
• Santa Rosa, Sonoma County (April 1995)
• Laguna Canyon, Laguna Beach, Orange County (March 9, 1996)
• Vermont, Los Angeles County (June 4, 1996)
• Simi Valley, Ventura County
  (June 7, 1996)
• (Northeastern Modoc), Modoc County (June 25, 1996)
• Gilroy, Santa Clara County (August 10, 1996)
• Hermitt [Creek?],
  (January 1, 1997)
• Mount Madonna / Watsonville, Santa Cruz County
  (March 18, 1997)
• Madera, Madera County
  (March 27, 2000)
• Santa Maria, Santa Barbara County (April 16, 2001)
• Fresno, Fresno County
  (August 11, 2002)
• Rockville (1), Solano County
  (June 28, 2003)
• Rockville (2), Solano County
  (June 28, 2003)
• Vacaville, Solano County
  (July 8, 2003)
• Fairfield, Solano County
  (July 11, 2003)
• Cordelia / Fairfield, Solano County (July 16, 2004)
• Red Bluff, Tehama County
  (May 11, 2007)
• Hidden Valley Lake, Lake County
  (May 17, 2010)
• Greenfield, Monterey County/ Bakersfield, Kern County
  (June 22, 2010)