The family that for decades operated the Stewart Horse Camp has discontinued its agreement with the National Park Service, leading equestrians to ask whether the Olema site will reopen after its seasonal closure. 

The campground, run for nearly 50 years by the Stewart family, had been operating on a one-year extension after its 10-year concessionaire agreement expired in 2018. Last November, the park announced that Amanda Wisby—a fourth-generation rancher on the land—had decided to end…