R B Winter State Park is on route 192 about an hour east of State College. The park and surrounding Bald Eagle State Forest offer quite a few trails open to horseback riding. The park is also easily reached from areas around Lewisburg, such as Selinsgrove, Sunbury, Northumberland, and Milton.
The map below summarizes trails around the park, and the link allows you to download them to your device.
Waymarked Trails: R B Winter region 
General Info
Forest around R B Winter is pretty classic central Pennsylvania mountain country. Expect rocks and fairly steep grades. Some trails have fairly easy footing of mostly dirt. Many are much rockier and may not be much fun. While the trail network is fairly extensive, there aren’t a lot of parking options for horse trailers outside the core of the park.
Parking
A large parking lot designated for horse trailers is on Sand Mountain Road, just north of the beach. The western lot of four is gravel and has more grass than others. That’s by far your best choice, unless you are trying to access distant trails.
A shale pit next to the motorized campsite on Black Gap Road has space to park one or two trailers. If someone is camped there it may be tight.
Nearby McCall Dam State Park has limited parking and is a popular spot for hiker parking. At slow times you might squeeze in there. Two trailers might be pushing it.
Parking lots right on Rt 192 at the park are not intended for horse trailer parking, as there are no shared-use trails connecting to them.
If you are interested in trails to the west of the park, there is good horse trailer parking on Cabin Road along 192 just east of the village of Livonia. This is an old section of road which is nicely shaded and gets you back off the main highway. It accesses several nearby trails.
For trails farther out you will probably need to scout a spot to pull off along the road, or park at a gate without blocking it. Frustrating that they can’t have a few more parking areas to access the extensive number of trails.
Loop Trails
A few suggested short loops are shown below.
Short Loop
This 3 mile loop from the main parking area involves a very easy walk on Sand Mountain Road and a climb on McCall Dam Road (both partially paved). Neither are likely to have much traffic. Boiling Spring Trail is a moderately steep descent back to the park.
Black Gap Wet Loop
This is a pleasant 4 mile loop from the campsite on Black Gap Road. Where Black Gap Trail approaches Black Gap Road there are several stream crossings to deal with. Two are rocky fords, which are very slippery with moss covered rocks with gaps between them. Not very horse friendly! The other 3 have narrow wooden bridges about 3 feet wide. They do now have toe-boards on the sides. They are treated lumber and can be quite slippery. If you have shoes with traction (e.g. borium) or boots with rubber soles you should be ok, just be cautious. Bypassing the bridges and fording these streams can be difficult, as the area is quite rocky and there is not clear access to the streams. This is a somewhat challenging area, especially during slippery/wet season.
Black Gap Longer Loop
This 6.6 mile loop from the campsite on Black Gap Road just goes farther west than the loop above. Please be sure to read the notes above about the stream crossings; they can be a little tricky.
For a little more distance simply continue west to Engle Road before returning. That end of Black Gap Trail is quite enjoyable. Well, most of BGT is pretty scenic.
Cabin Road Loop 1
This loop looks easy but most of it is somewhat challenging due to rough terrain (grade B-). The basic loop is 5.3 miles but we rode to Livonia at the end, making it 6.1 miles. Parking is at Cabin Road off Route 192 just east of Livonia. There is lots of horse trailer parking on an old stretch of highway.
Old Narrows Trail parallels the highway. It is scenic, with ups and downs and twists. It has intermittent noise from the road; usually traffic is light. Footing is rather rocky and uneven. A few trees must be bypassed, but it obviously receives regular maintenance.
Douty Mill Trail is an easy access road as far as the stream, where it enters a hemlock grove. Then it becomes a challenging climb, with low branches, many trippy roots and rocks, and a (small) stream ford with mossy rocks. Not bad for a short trail!
Stover Gap East trail seems like it would be an easy forest road but the east end is fairly rocky and uneven. Ferns in early fall hide rough ground. It improves a bit as you go west and goes through a couple nice pastures for snack breaks. Beyond Schade Path Link Trail it appears to be easy.
Schade Path and its link trail are snowmobile trails that are wide and easy, with grass in stretches and a substantial bridge.
We will try to add more loop trail suggestions in 2025.
Facilities
Restrooms and water fountains are between the main parking areas and the beach at the park. Fountains do have a “pet faucet” for filling buckets.
Near the recreational parking lots on Sand Mountain road there is an RV dump station with a water hydrant. If nobody is using it, you may be able to water or even hose off horses here.
A couple springs are near the beach but not readily accessible to water your horse.
Amenities
The park is remote from food or fuel, so gas up and take a lunch!
Closest offering is Forest Hill General Store, with fuel and fresh sandwiches, located about 8 miles east on route 192.
If you are coming from State College, there is a new local-foods cafe called Kinfork Cafe on route 192 in Madisonburg. We haven’t tried it.
If you need adult refreshments after a ride, Millheim has Elk Creek Cafe and Brewery; Mifflinburg offers Rusty Rail Brewing.
Towns of Millheim or Mifflinburg are the next closest choices. Both offer several food and fuel choices. Mifflinburg is bigger, with one fast food place, a 24 hour convenience store, and several better food choices.
When in Mifflinburg, check out the Buggy Museum for a fascinating look at the town’s horse-related history!
Horse Camping
Hall Mountain Group Camping Area on route 477 outside Livonia offers six campsites suitable for horse camping near RB Winter state park. It has direct access to area trails, particularly Hall Trail.
As is typical for Pennsylvania, it’s not promoted. You’d be lucky to even find it mentioned on the Bald Eagle state forest webpage! And of course it offers NO facilities. No water, no restrooms.
Motorized campsites 2 and 12 in Bald Eagle State Forest are also at trailheads and are pretty popular with horse campers.