Patapsco Valley State Park · MD
Old Main Line (HoCo Thru Trail)
Live · updated
Today
Workable day for mountain biking.
Today's best: mountain biking
Conditions
Score by activity
Hiking
Marginal conditions for hiking.
Trail running
Marginal conditions for trail running.
Mountain biking
Workable day for mountain biking.
Dog walking
Marginal conditions for dog walking.
Score breakdown
- · 82°F air — Within comfort range, outside ideal
- ✓ Trail: prime — No meaningful rain in the last 48 hours. Trail surface is dry and tacky — prime traction.
- − 42 min of daylight — You need at least 59 min with margin. Bring a headlamp or start tomorrow.
Trail facts
- Distance
- 3.14 mi
- Elevation gain
- 168 ft
- Surface
- dirt
Trailhead
Coordinates
39.3144, -76.8363 — MD.
Park
Part of Patapsco Valley State Park (official site →).
Peak nymphal tick activity — check yourself within 2 hours of leaving the trail.
Nearby Trails
Frequently Asked
How long is Old Main Line (HoCo Thru Trail)?
Old Main Line (HoCo Thru Trail) is a 3.14-mile route with 168 feet of elevation gain. 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 Old Main Line (HoCo Thru Trail)?
Old Main Line (HoCo Thru 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 Old Main Line (HoCo Thru Trail), and where do closure alerts come from?
Old Main Line (HoCo Thru Trail) is in Patapsco Valley 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.