Greene County Fair 2024 Dates.  — join us for a special sunday at the greene county fair on august 4, 2024!  — ** 2023 coverage of the greene county fair ** dayton, ohio (wdtn) — although summer is less than 200 days away, the dates for the 2024 fairs across ohio.

 — sunday, august 4, 2024. Join us in beautiful xenia, ohio for the greene county fair.