The clearest safety concern at Manassas National Battlefield Park is flooding. Prince William County recorded 9 flood events and 3 flash flood events in recent years, making rapid water accumulation the dominant hazard for visitors exploring the open fields and creek-adjacent trails of this historic site. Thunderstorm wind rounded out the top recorded incidents, meaning storms here tend to arrive fast and bring multiple threats at once.
When planning your visit, download a weather radar app before you go and check it actively if skies darken — flash floods can overtake low-lying trail areas with little warning. Pack waterproof footwear and keep your vehicle parked on elevated ground rather than near drainage areas or creek crossings. If you hear thunder, move immediately to your vehicle rather than sheltering under trees, since thunderstorm wind events frequently accompany the same storm systems driving local flood risk.
Top recorded hazards in Prince William County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Flood 9
- Thunderstorm Wind 5
- Flash Flood 3
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About Manassas National Battlefield Park
On July 21, 1861, two armies clashed for the first time on the fields overlooking Bull Run. Heavy fighting swept away any notion of a quick war. In August 1862, Union and Confederate armies converged for a second time on the plains of Manassas. The Confederates won a solid victory bringing them to the height of their power.
Weather
Spring: Mild weather, with average low/high temperatures from 33 F to 75 F. Variable rainfall, with May being the wettest month of the year on average. Summer: Warm and humid weather, with average temperatures from 61 F to 88 F. Variable rainfall, with occasional downpours during storms. Fall: Mild weather, with average temperatures from 35 F to 79 F. Variable rainfall. Winter: Mild to cool weather, with average temperatures from 24 F to 47 F. Annual snowfall averages about 22 inches.