Guiding companies say all climbers on the Nepal side of Mount Everest have left the mountain and the climbing season is over following a deadly avalanche that swept through base camp following the huge earthquake in Nepal.

Gordon Janow is director of programs at Seattle-based Alpine Ascents International. He says most Everest summits occur between May 10 and 20, so it's too late to think about trying to go back up the mountain before monsoon season.

The huge avalanche on Everest that killed 18 and injured dozens happened after Saturday's magnitude 7.8 earthquake killed more than 4,000 people in the Himalayan nation.

Every year hundreds of people attempt to scale the world's tallest mountain, with many paying tens of thousands of dollars to guide companies that attempt to get them to the 29,029-foot summit.

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