2025-07-02 2025 Marin County Fair 2025 Marin County Fair July 2 @ 8:00 am - July 6 @ 5:00 pm 2025 Marin County Fair Held annually over the 4th of July holiday, fairgoers enjoy five days of art, rides, concerts, fair food delights, shopping and so much more. Fair Tickets available May 1!