Prince William Forest Park · VA
County Road 639
Live · updated
Today
Workable day for trail running.
Today's best: trail running
Conditions
Score by activity
Hiking
Marginal conditions for hiking.
Trail running
Workable day for trail running.
Dog walking
Workable day for dog walking.
Score breakdown
- − 80°F air — Above trail running's comfort zone (28–78°F)
- ✓ 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 52 min with margin. Bring a headlamp or start tomorrow.
Trail facts
- Distance
- 1.56 mi
- Elevation gain
- 210 ft
Trailhead
Coordinates
38.4930, -77.4134 — VA.
Park
Part of Prince William Forest Park (official site →).
Peak nymphal tick activity — check yourself within 2 hours of leaving the trail.
Nearby Trails
Frequently Asked
How long is County Road 639?
County Road 639 is a 1.56-mile route with 210 feet of elevation gain. The trail facts panel on this page lists distance, surface, and access tags as they appear in OpenStreetMap.
Who manages County Road 639, and where do closure alerts come from?
County Road 639 is in Prince William Forest Park, which is managed by the National Park Service. Closure and advisory data on this page comes from the live NPS alerts API for this park unit. Always confirm against the park's own page before driving — emergency closures can post faster than scrapers refresh.