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United States
Pennsylvania

Union County

The best MTB trails in Union County

By Fede from komoot

·

Updated June 4, 2026

If you've ever tried to plan mountain biking in Union County, you know how quickly the options can feel overwhelming. Sifting through countless trails to find the ones genuinely worth your time and effort can be a real headache. That's where we come in. Our komoot community has ridden, mapped, and reviewed these routes, so we've curated a shortlist of the absolute best, saving you the guesswork.

Mountain biking in Union County, central Pennsylvania, is defined by its state parks, dense woodlands, and rolling hills. You can expect trails that navigate through forested areas, along creeks, and through gaps, offering a mix of moderate paths and truly challenging mountain bike trails with notable elevation changes. It’s a region that rewards those who love to earn their views.

If you only do one ride, make it the Raymond B. Winter State Park loop. This 22.0 miles (35.5 km) difficult route is the most popular for a reason, winding through varied terrain and showcasing the best of the park. For a slightly shorter, but still rewarding, experience, the Raymond B. Winter State Park via the Black Gap Trail offers a fantastic 10.9 miles (17.5 km) moderate path with a great mix of forest and scenic sections. With more than 20 mountain bikers already exploring Union County with komoot, you're in good company.

If you only do 3 of these routes

  1. 1

    Raymond B. Winter State Park loop
  2. 2

    Raymond B. Winter State Park via the Black Gap Trail
  3. 3

    Black Gap Trail loop from R. B. Winter State Park

Compare these routes at a glance

Trail

Distance

Elevation

Difficulty

Raymond B. Winter State Park loop

35.5 km

530 m

Hard

Raymond B. Winter State Park via the Black Gap Trail

17.5 km

290 m

Moderate

Black Gap Trail loop from R. B. Winter State Park

52.6 km

940 m

Hard

Sand Mountain Road – Penn's Creek loop from Millheim

131 km

2,170 m

Hard

East Run Road loop from Williamsport

101 km

2,110 m

Hard

Black Gap Trail loop from Livonia

28.8 km

510 m

Hard

Poe Paddy Tunnel – Penn's Creek loop from Millheim

51.0 km

730 m

Moderate

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1.

Raymond B. Winter State Park loop

35.5km

03:16

530m

530m

The Raymond B. Winter State Park loop offers a demanding mountain biking experience through central Pennsylvania's varied terrain. You'll navigate challenging rock gardens, flowing singletrack, and winding trails through picturesque oak and pine forests, with views of Halfway Lake. This difficult 22.0 miles (35.5 km) route, featuring 1738 feet (530 metres) of elevation gain and an estimated duration of 3 hours and 15 minutes, is best suited for riders with advanced skills and good fitness who are ready for technical sections.

To tackle the Raymond B. Winter State Park loop, plan to start from the state park, which provides access to the extensive trail network within the Bald Eagle State Forest. While specific parking information for this particular loop isn't detailed, ample parking is typically available within the park. Always check current trail conditions, especially regarding water levels on trails like the Black Gap, before heading out for your ride.

What makes mountain biking at Raymond B. Winter State Park particularly notable is its seamless connection to the vast Bald Eagle State Forest, offering a wide array of options beyond this loop. The park itself sits in a sandstone basin, supporting Halfway Lake, and holds historical significance with its Civilian Conservation Corps-built dam. This region provides a dynamic riding experience, from moderate introductory trails to expert-level technical challenges, making it a compelling destination for advanced mountain biking.

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2.

Raymond B. Winter State Park via the Black Gap Trail

17.5km

01:31

290m

300m

The Black Gap Trail at Raymond B. Winter State Park offers a dynamic mountain biking adventure through central Pennsylvania's Ridge and Valley Province. You'll navigate a mix of rocky ridges, dense oak and pine forests, and flowing singletrack, with some challenging rock gardens. Keep an eye out for views of Halfway Lake and the lush mountain laurel and ferns that line the path. This moderate 10.9-mile (17.5 km) route with 962 feet (293 metres) of elevation gain typically takes around 1 hour and 31 minutes to complete.

Access the Black Gap Trail directly from Raymond B. Winter State Park. Be aware that the Middle section can be very wet for much of the year, sometimes resembling a creek, so plan your visit accordingly, perhaps aiming for drier seasons. While rated moderate, this trail requires advanced riding skills, so come prepared for technical sections and some short, punchy climbs.

Considered one of the most popular mountain biking trails in the region, the Black Gap Trail is a must-do for many riders. It's part of an extensive network within Bald Eagle State Forest, offering over 48 miles of off-road trails and nearly 100 miles of connecting forestry roads, allowing for varied route combinations and making it a versatile destination.

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3.

Black Gap Trail loop from R. B. Winter State Park

52.6km

05:05

940m

940m

The Black Gap Trail loop from R. B. Winter State Park offers a demanding 32.7-mile (52.6 km) mountain bike adventure, featuring 3075 feet (937 metres) of elevation gain over an estimated 5 hours and 4 minutes. This difficult route winds through diverse landscapes, from dense oak and pine forests to cool hemlock groves and tunnels of rhododendron and mountain laurel. Expect a mix of flowing trails and highly technical, rocky sections that will test your skills, especially in the middle third which can become a water-filled creek bed after rain.

To tackle this challenging loop, plan your visit to R. B. Winter State Park, the starting point for the trail. It's crucial to check weather conditions beforehand, as the trail's middle section is prone to waterlogging. The recommended riding direction is from west to east, which can help manage some of the more technical descents and climbs.

This trail is a local favorite, renowned for its

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4.

Sand Mountain Road – Penn's Creek loop from Millheim

131km

11:45

2,170m

2,170m

The Sand Mountain Road – Penn's Creek loop from Millheim offers a demanding mountain biking experience through central Pennsylvania's varied landscapes. You'll traverse dense state forests, rolling hills, and the picturesque Penns Creek valley, encountering features like Poe Lake and Tea Kettle Pond within Poe Valley State Park. The route combines double-track gravel, old woods roads, and fun singletrack, with the Penns Creek Path following an old railroad bed past a unique mountain tunnel and an impressive trestle.

This is a difficult 81.5-mile (131.2 km) ride with a substantial 7118 feet (2169 metres) of elevation gain, requiring very good fitness and advanced riding skills for its estimated 11 hours and 45 minutes duration. The starting point is the historic town of Millheim. For mid-ride facilities, Poe Paddy State Park, accessible via a small bridge over Penn's Creek, offers a campground with restrooms and water, which is a welcome stop on such a long journey.

Beyond the physical challenge, this loop is notable for its blend of natural beauty and historical elements. Millheim itself boasts a rich history, with a Historic District featuring 176 Georgian and Victorian buildings. The Penns Creek Path's use of an old railroad bed provides a unique riding experience, showcasing the region's past alongside its diverse and rugged ecosystems, making it a standout East Coast mountain biking adventure.

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6.

Black Gap Trail loop from Livonia

28.8km

02:47

510m

510m

The Black Gap Trail loop near Livonia offers a truly engaging mountain biking experience in Bald Eagle State Forest. You'll navigate through diverse terrain, from open hemlock groves to tunnel-like passages of dense rhododendron and mountain laurel. Expect a mix of flowy sections and chunky, technical rock gardens, especially in the challenging middle part of the trail. It's a dynamic ride that keeps you on your toes, rewarding skill and focus with varied scenery.

Planning your ride on this difficult 17.9-mile (28.8 km) route, which typically takes around 2 hours and 46 minutes to complete with 1670 feet (509 metres) of elevation gain, requires some preparation. Be aware that the middle section can turn into a creek-like path after rain, and bridges can become slick. While there's an option to bypass the toughest parts via the Disabled Sportsman's Access Road, the full Black Gap Trail loop is where the real adventure lies for intermediate to advanced riders.

This trail is widely considered a

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7.

Poe Paddy Tunnel – Penn's Creek loop from Millheim

51.0km

03:52

730m

730m

The Poe Paddy Tunnel – Penn's Creek loop from Millheim is a diverse mountain biking adventure through Bald Eagle State Forest, blending historical rail trails with rugged singletrack. You'll navigate dense woodlands, follow the winding Penns Creek, and pass through the unique, nearly 300-foot-long Poe Paddy Tunnel. The route offers a mix of wide forest roads, smooth cinder paths, and technical sections, culminating in rewarding views from Penns View Vista.

This moderate 31.7-mile (51.0 km) loop, with 2404 feet (733 metres) of elevation gain, typically takes around 3 hours and 51 minutes to complete. It demands very good fitness and mountain biking skill, as some segments feature challenging gravel climbs and rocky singletrack that may require pushing your bike. Remember to bring a flashlight for the dark Poe Paddy Tunnel and be prepared for potential bike portaging across Penns Creek in one spot.

Tracing the path of the former Lewisburg and Tyrone Railroad, this trail offers a fascinating glimpse into the region's lumber history. Beyond the tunnel, you'll encounter the picturesque confluence of Big Poe Creek and Penns Creek, and ride past Poe Lake within Poe Valley State Park. It's a true central Pennsylvania hidden gem for advanced mountain biking, combining natural beauty with historical intrigue.

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Tips from the Community

Andrus
August 19, 2024, Black Gap Trail

The Black Gap Trail is one of the more popular trails in Bald Eagle State Forest. The trail is often covered in water in some sections as it crosses a number of creeks and drainages, and it has its fair share of rocky stretches to challenge more technical riders.

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Andrus
August 19, 2024, Sand Mountain Road

Sand Mountain Road is a double track gravel road that runs the length of Poe Valley State Park. As such, it connects to many of the trails within the park and you will most likely end up riding it for a stretch to get to and from your favorite trails.

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Millheim is a small town with a large history. The town's Historic District consists of 176 Georgian and Victorian buildings. The entire district was added to the National Register of Historic Places in 1986.

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This small state parks sits at the confluence of Penns Creek and Big Poe Creek. There's a campsite, restrooms, water, and a number of trails to access. It's a good starting point to explore all that Bald Eagle State Forest has to offer.

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Will
February 16, 2024, Penn's Creek

Here there is a small, paved, bridge crossing Penn's Creek and leading to Poe Paddy State Forest.

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Will
February 16, 2024, Poe Paddy Tunnel

This small tunnel at the end of the Penn's Creek Path connects to Penn's Creek and continues on towards Poe Paddy State Park.

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This campground has tent spots and public restrooms. It is also a good spot to fill up water before a ride.

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Raymond B. Winter State Park, also known as R. B. Winter State Park, is a 695-acre park that is surrounded by Bald Eagle State Forest in the ridge and valley region of Pennsylvania.

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Frequently Asked Questions

How many mountain bike trails are available in Union County?

Komoot features 6 mountain bike trails in Union County. These routes offer a variety of experiences, from moderate paths to challenging rides through diverse terrain.

Are there mountain bike trails suitable for beginners in Union County?

While Union County offers primarily moderate to difficult mountain bike trails, routes like the Raymond B. Winter State Park via the Black Gap Trail provide a good entry point for those with some experience, covering 17.5 km with moderate difficulty.

What are some challenging mountain bike trails in Union County?

For experienced riders seeking a challenge, Union County offers several difficult routes. The Sand Mountain Road – Front Mountain loop from Millheim is a demanding 131.3 km trail, while the East Run Road loop from Williamsport spans 100.6 km, both featuring significant elevation changes.

Are there any loop mountain bike trails in Union County?

Yes, many of the mountain bike trails in Union County are loops. Popular options include the difficult Raymond B. Winter State Park loop (35.5 km) and the longer, challenging Black Gap Trail loop from R. B. Winter State Park (52.6 km).

What is the best season for mountain biking in Union County?

Union County's mountain biking trails are generally best enjoyed from spring through fall. The dense woodlands and state parks offer beautiful scenery during these seasons. Winter conditions can make trails icy or muddy, requiring caution.

Are there mountain bike trails with convenient parking in Union County?

Many trails in Union County, particularly those within state parks like Raymond B. Winter State Park, offer designated parking areas. It's always advisable to check the specific tour details on komoot for parking information before you go.

What kind of terrain can I expect on mountain bike trails in Union County?

Mountain biking in Union County features diverse terrain, including dense woodlands, rolling hills, and paths along natural features like creeks and gaps. You can expect varied surfaces and notable elevation changes, providing a dynamic riding experience.

What do other mountain bikers enjoy most about mountain biking in Union County?

Mountain bikers on komoot frequently praise the diverse terrain and natural beauty of Union County. The region's state parks and forested areas offer engaging rides, with many appreciating the challenging climbs and scenic descents.

Are there any moderate-difficulty mountain bike trails in Union County?

Yes, Union County has moderate mountain bike trails suitable for riders looking for a less strenuous but still engaging experience. The Millheim, Pennsylvania – Penn's Creek loop from Millheim is a moderate 51.1 km route that takes you through scenic areas.

How long do mountain bike trails in Union County typically take to complete?

The duration of mountain bike trails in Union County varies significantly based on length and difficulty. Moderate routes like the Raymond B. Winter State Park via the Black Gap Trail can take around 1 hour 30 minutes, while more challenging and longer trails, such as the Sand Mountain Road – Front Mountain loop from Millheim, can require over 11 hours.

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