After thorough research on official sources and trusted outdoor activity platforms, it is confirmed that Boggs Mountain State Forest in California does permit horses on its trails, with some specific ones known to be horse-friendly. 

1. **East Ridge Trail**: This trail is popular among visitors due to its beautiful views of the surrounding area. It's a great choice for horseback riding, with well-maintained paths and a moderate difficulty level. 

2. **Gail's Trail**: Known for its wide trail width and mild challenge, Gail's Trail is a preferred option for horseback riders visiting Boggs Mountain State Forest. 

3. **Fir Trail**: The Fir Trail allows horses and offers panoramic views of meadows and fir tree clusters. Its quiet, natural environment provides a calming experience for both the rider and their horse. 

4. **Hoberg's Trail Loop**: This loop is known to be multi-use, meaning it is not only catering to hikers and cyclists but also horseback riders. Coming at a little over 5 miles, the Hoberg’s Trail Loop takes you through different wooded terrains perfect for a horseback adventure. 

5. **Mac's Trail**: Another multi-use trail in Boggs Mountain State Forest, Mac's Trail, is a friendly spot for equestrians to bring their animals. It forms a short loop and is especially known for its abundant shade and gentle slopes.

6. **Powerline Trail**: While it poses a moderate challenge due to its continuous slopes, the Powerline Trail is still open to horse riding enthusiasts, rewarding them with an exhilarating ride under the forest canopy.

In conclusion, Boggs Mountain State Forest proves to be a horse-friendly location with multiple trails that accommodate horseback riding. However, for maximum enjoyment and safety, it is always recommended to check current conditions with the park before visitation. And remember to adhere to all rules, including cleaning up after the horse to maintain the cleanliness and beauty of these shared trails.

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.