Oc County Fair 2025 Dates. The 2025 oc fair runs july 19 through aug. Looking for information on 2025 oc fair competitions?
Members of rcs unload a ride from a truck as they prepare for the oc fair in costa mesa on thursday, july 11, 2025. Mon, august 19, 2025, 6:05 am edt · 8 min read.