Hillsborough County Fair 2025 Schedule. The 2025 hillsborough county fair kicks off on october 31 and runs through november 11, bringing 12 days filled with fun, entertainment, and a sense of community. 2025 hillsborough county fair board of directors;

The 2025 hillsborough county fair kicks off on october 31 and runs through november 11, bringing 12 days filled with fun, entertainment, and a sense of community. The highly anticipated 2025 demo derby rules are now available!