- 1928 - Warren County AGRICULTURE FAIR JULY 12-19, 2025 | Roseville, Illinois CELEBRATING 100 YEARS WITH A NEW VISION Since 1928, the Warren County Agricultural Fair has been a place where tradition meets community. Now, as we approach our 100th anniversary in 2028, we're excited to announce something truly transformative - the 2025 groundbreaking & beginning construction of a brand-new multi-purpose building, the Pattee Pavilion, that will stand as the cornerstone of the fairgrounds for generations to come. WARREN COUNTY FAIR - 1928 - Warren County AGRICULTURE FAIR JULY 12-19 , 2025 | Roseville , Illinois CELEBRATING 100 YEARS WITH A NEW VISION Since 1928 , the Warren County Agricultural Fair has been a place where tradition meets community . Now , as we approach our 100th anniversary in 2028 , we're excited to announce something truly transformative - the 2025 groundbreaking & beginning construction of a brand - new multi - purpose building , the Pattee Pavilion , that will stand as the cornerstone of the fairgrounds for generations to come . WARREN COUNTY FAIR