Orange County Fair 2024 Competition Dates. Sign up to receive the latest news on competition categories, entry delivery dates, guidelines and more! Looking for information on 2025 oc fair competitions?

For the 2024 oc fair, everyone is invited to showcase their talents by participating in more than 20. 70th annual orange county science & engineering fair tentative fair schedule friday, september 6, 2024 (8:00am pst):