Wolf Creek, yes. There’s something on Moorpark Rd near a nursery a bit before the Norwegian Grade, but I don’t know if it’s boarding or training only or strictly private. There are people running training businesses, such as the Stewarts. There’s QofE but that’s private.
According to my friend who lives off Yucca, the equestrian ring and trailhead in/near Bill’s Canyon was maybe originally supposed to be an equestrian center.