Greenbrier State Park · MD
Big Red Trail
The park's longest and most popular loop, roughly 4.9 miles through South Mountain's oak-and-maple hardwood forest, finishing with a level walk along the shore of 42-acre Greenbrier Lake.
Live · updated
Today
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Conditions
Score by activity
Hiking
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Trail running
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Mountain biking
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Score breakdown
- · 83°F air — Within comfort range, outside ideal
- − Thunderstorms — Get off exposed ridges before they arrive
- ✓ Trail: prime — No meaningful rain in the last 48 hours. Trail surface is dry and tacky — prime traction.
- − 83 min of daylight — You need at least 88 min with margin. Bring a headlamp or start tomorrow.
Trail facts
- Distance
- 4.9 mi
- Elevation gain
- 724 ft
- Surface
- dirt
- Difficulty
- moderate
Trailhead
Coordinates
39.5346, -77.6248 — MD.
Park
Part of Greenbrier State Park (official site →).
Peak nymphal tick activity — check yourself within 2 hours of leaving the trail.
Frequently Asked
How long is Big Red Trail?
Big Red Trail is a 4.9-mile route with 724 feet of elevation gain — moderate — some sustained climbing or technical sections; expect to work for it but no specialized skills required. The trail facts panel on this page lists distance, surface, and access tags as they appear in OpenStreetMap.
What's the trail surface like at Big Red Trail?
Big Red Trail is natural dirt singletrack — soft underfoot, holds water, slow to dry after rain. Today's mud rating, derived from recent precipitation and the surface type, is shown in the conditions panel above.
Who manages Big Red Trail, and where do closure alerts come from?
Big Red Trail is in Greenbrier State Park, which is managed by the managing agency. Closure and advisory data on this page comes from the agency. Always confirm against the park's own page before driving — emergency closures can post faster than scrapers refresh.