Thunderstorm wind is the standout hazard at Hopewell Culture National Historical Park, with 6 recorded wind events in Ross County alongside 3 flash flood incidents. These storms can roll through Ohio's river valleys quickly, turning low-lying areas near the park's earthworks into flood-prone zones with little warning. The county's violent crime rate of 315.6 per 100,000 (2023) is also worth noting, sitting above the national average for a rural area.
When a storm approaches, move your vehicle and tent away from the park's open ceremonial grounds and any drainage channels that feed into the Scioto River basin — flash floods here can rise fast. Pack a NOAA weather radio or download the NWS app before you arrive, since cell service along Route 104 can be spotty during the worst squalls. Keep valuables locked in your vehicle and park in well-lit areas near the visitor center rather than remote trailhead lots after dark.
Top recorded hazards in Ross County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Thunderstorm Wind 6
- Flash Flood 3
- Hail 1
- Flood 1
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About Hopewell Culture National Historical Park
Nearly 2000 years ago, Native Americans built dozens of monumental mounds and earthen enclosures in southern Ohio. These earthwork complexes were ceremonial landscapes used for feasts, funerals, rituals, and rites of passage associated with a Native American religious movement that swept over half the continent for almost 400 years. Come walk among the earthworks and experience the past.
Weather
The park lies in a humid continental zone with a generally temperate climate. Winters are mildly cold with average temperatures around 30 degrees (F). Summers are hot and humid with an average temperature around 75 degrees (F). Average annual total rainfall is just under 38". Snowfall in the winter is generally light with an average total snowfall of less than 24".