Despite potential problems, the climbing season kicked off at the end of March, after the first expedition left Kathmandu. From there, climbers travel by plane to Lukla, the town that serves as the starting point for the 10-day trek to base camp. Once at camp, they spend weeks there acclimating to the altitude and waiting for a window of clear weather to attempt the summit.

Sandro Gromen-Hayes, a filmmaker who documented a British Army expedition of Everest in 2017, said Thamel, the area of Kathmandu popular with broke backpackers, was quieter this year.

“It was swarmed with trekkers and climbers and stoners and everything in between,” he said of his previous visit. “Now Thamel is much quieter.”

Mr. Gromen-Hayes, 31, came to Nepal from Pakistan, where he filmed an expedition on K2, the world’s second highest peak, which is known because of its ferocious winds as “the savage mountain.” Usually bereft of climbers in winter, it saw dozens of top mountaineers who had been cooped up for months in virus lockdowns and then flocked to K2 in December to make an attempt.

Among the climbing community, “I don’t think a lot of people are concerned about the corona angle,” he said.

Some climbers, like Mr. Pattison, the former N.F.L. player, said they were drawn to Mount Everest this year because they assumed it would be less crowded. But Nepal expects more climbers to apply for licenses beyond the more than 300 who have already, said Mira Acharya, the director of Nepal’s tourism department.

Mr. Pattison plans to trek in surgical gloves and gown, trading in his face mask for an oxygen mask only when he begins the arduous climb from base camp to the peak.

The record books are motivating Mr. Pattison. He has already climbed the six other peaks on the other continents. Should he climb Mt. Everest, he will be the oldest N.F.L. player to have surmounted the Seven Summits, as the peaks are known, and the first to climb Everest and then clamber up neighboring Lhotse, at 27,940 feet the world’s fourth-highest peak, within 24 hours.

“I’ve been at this for nine years,” Mr. Pattison said. Despite the pandemic, he added, “I’m ready to go.”

Bhadra Sharma reported from Kathmandu, Nepal, and Emily Schmall from New Delhi.

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