San Diego Fair 2025. The 2025 san diego county fair is open june 11 through july 6 (closed mondays & tuesdays.) the fair is open from 11am to 11pm each day. Dates & times the 2025 san diego county fair is open june 11 through july 6.
The fair will feature food, music, rides, games, exhibits, entertainment, animals,. With the 2024 san diego county fair approaching this year with a “let’s go retro” theme, the del mar fairgrounds board of directors voted april 9 to approve the themes for the following two years.