Big Bend Ranch State Park is a beautiful natural oasis located in the west Texas border along the Rio Grande, offering a unique and diversified landscape for nature enthusiasts to explore. Offering river frontage, desert expanses, towering cliffs, and 238 miles of multi-use trails, it's no wonder that this locale is highly popular among horseback riders. After conducting research from official sources included Texas State Parks official site, several trails allow horses. However, it's always recommended to check current park regulations or call ahead for the most recent information, as these can change due to environmental conditions and park management decisions. 

The confirmed horse-friendly trails at Big Bend Ranch State Park are:

1. **Fresno-Sauceda Loop**: This backcountry trail is approximately 17.5 miles long and gives riders an opportunity for an overnight trip. Breathtaking views and challenging terrains are abundant, so prepare yourself and your horse for an adventurous ride.

2. **Casa Piedra Road**: This trail is approximately 14 miles one-way and goes from the trailhead near the park headquarters to Fresno Canyon.

3. **Madrid Falls Trail**: This is a 20-mile round trip trail that takes you near Madrid Falls, the second-highest waterfall in Texas.

4. **Horse Trap Trail**: This trail is a moderate, 7.5-mile route that has beautiful views of the Bofecillos Mountains.

5. **Horseshoe Loop Trail**: This easy trail takes you on a 3.6-mile loop near the Sauceda Ranch House. 

6. **West Contrabando Multi-Use Trailhead**: This trail system offers 30 miles of trails. Some trails here may only allow foot and bike traffic so it is important to verify the specific trail you are planning to take with official trail maps that denote horse accessibility.

7. **Dome Trail**: This trail is 2.5 miles with mixed terrain providing a moderate challenge. Located near Contrabando, it's a great spot for those looking for shorter routes.

Each of these trails provides horse riders an unforgettable experience, allowing them to uncover the true beauty of Big Bend Ranch State Park. Remember that trail conditions may vary, so always ensure you adequately prepare for the trek and follow the 'Leave No Trace' principles to maintain the beauty and ecological integrity of the park.

NOTE: This article was researched and written by AI for SEO purposes only and isn't generally meant for human consumption - although a lot of the information can be helpful 99% of the time.  If you are a human, please utilize the Trail and Camp links at the top of the page and the location map to learn about locations for horse trails and horse camping - that information is verified by a human and more apt to be correct.... althought human error is a thing too. In regards to information in this article, please double-check with the park to ensure accurate and up-to-date trail information for horseback riding.