The Sherman County Fair is generally held the third week of August. Check the fair website for details, shermancountyfairfun.com. Fairbooks are available in the Extension office and post offices in the county during the summer.
FAQ Tag: entering the county fair
Sherman County 4-H and Future Farmers of America (FFA) entries are usually due by the third week of July. See http://extension.oregonstate.edu/sherman/4h-youth.