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List of 2018 California Sci-Fi Conventions
| Dates | Location | |
|---|---|---|
| Cos-Losseum Cosplay Con San Diego 2018 | January 6-7, 2018 | Four Points by Sheraton San Diego San Diego, CA |
| ConDor 2018 | January 19-21, 2018 | Handlery Hotel San Diego San Diego, CA |
| Gallifrey One 2018 | February 16-18, 2018 | Los Angeles Airport Marriott Los Angeles, CA |
| FOGcon 2018 | March 9-11, 2018 | Walnut Creek Marriott Walnut Creek, CA |
| ConQuest Sac 2018 | March 23-25, 2018 | McClellan Conference Center Sacramento, CA |
| April 20-22, 2018 | Gold Country Fairgrounds & Event Center Auburn, CA |
|
| Intergalactic Expo 2018 | May 6, 2018 | West Sacramento Civic Center West Sacramento, CA |
| WhedonCon 2018 | May 18-20, 2018 | Warner Center Marriott Woodland Hills Los Angeles, CA |
| Menlo Park Library Comic Con 2018 | May 19, 2018 | Menlo Park Library Menlo Park, CA |
| BayCon 2018 | May 25-28, 2018 | San Mateo Marriott San Francisco Airport San Mateo, CA |
| InterGalactiCon 2018 | June 15-16, 2018 | Town and Country San Diego San Diego, CA |
| AlienCon 2018 | June 15-17, 2018 | Pasadena Convention Center Pasadena, CA |
| August 11, 2018 | Pasadena Convention Center Pasadena, CA |
|
| Los Angeles Comic Book and Science Fiction Convention 2018 | August 12, 2018 | The Reef Los Angeles, CA |
| Worldcon 76 | August 16-20, 2018 | San Jose McEnery Convention Center San Jose, CA |
| StocktonCon 2018 | August 18-19, 2018 | Stockton Arena Stockton, CA |
| Back to 1885 | September 6-9, 2018 | Columbia State Historic Park Columbia, CA |
| SD Who Con 2018 | October 19-21, 2018 | Handlery Hotel San Diego San Diego, CA |
| Campbell Con 2018 | October 20, 2018 | West Valley College Saratoga, CA |
| Loscon 2018 | November 23-25, 2018 | Los Angeles Airport Marriott Los Angeles, CA |
| Smofcon 2018 | November 30 - December 2, 2018 | Flamingo Conference Resort and Spa Santa Rosa, CA |
| Dates | Location |