The annual Tenzing-Hillary Everest Marathon, which kicked off in 2003, is usually held in May to mark the anniversary of the first conquest of Everest by Tenzing Norgay and Edmund Hillary on May 29, 1953.
But organisers postponed this year's race to October after a massive earthquake hit the Himalayan nation in April, killing nearly 8,900 people and triggering an avalanche on Everest base camp that left 18 dead.
"Everest represents Nepal. We want to tell the world that Nepal is safe by successfully organising an event like this," he said.
Fifty-four people from countries including the UK, United States, Israel, Poland and Australia took part in this year's race, with half of the participants belonging to Nepal.
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Runners in trekking boots kicked off the marathon around 07:00 AM (local time), with the snow-covered trails taking them from Everest base camp at a height of 5,364 metres to the finishing line about 2,000 metres below in the Himalayan town of Namche Bazaar.
"A race at this altitude is very difficult. I am very happy to have come first," Gurung told AFP.
The air at base camp contains only half as much oxygen as at sea level, leaving many runners gasping for breath on even the slightest incline along 42 kilometres of narrow, rocky mountain paths.
While turnout was far lower than the 150 people who took part last year organisers said they were happy nonetheless.
They describe the route, which weaves past Buddhist monasteries, yak herds and over suspension bridges, as "probably the most adventurous trail run in the world".