Mendocino County Fair 2024 Schedule. 38th annual mendocino county science & engineering fair! Celebrate the summer solstice & world peace with the best in roots reggae and world music.
Also known as the 19th district agricultural association. Mendocino co., 9/13/22 — mendocino county’s fall bounty is celebrated each september at the county fairgrounds in boonville, with livestock shows, sheepdog.