But some climbers try to summit the country’s mountains on their own. Maheshwor Neupane, the secretary of Nepal’s Ministry of Culture and Civil Aviation, said the new rules, which were introduced on Thursday, require that all climbers, regardless of their experience level, be accompanied by guides.

The prohibition will start soon, he said, and should apply to the spring climbing season.

Climbers with physical disabilities will also be required to obtain health clearance from their doctors before the tourism ministry issues local climbing permits, Mr. Neupane added.