Park officials say rangers were contacted by Denver police who had been notified by a family member that 30-year-old Ryan Albert, of Marlton, New Jersey was overdue from a planned climb on Thursday.
Albert's rental car was found at the Longs Peak trailhead Friday afternoon.
Park officials say Albert's planned destination or route was unknown.
Albert was last seen leaving the Denver area early Thursday October 4; he was wearing dark clothes and a backpack.
The weather forecast on Saturday for the Longs Peak area calls for freezing temperatures and severe and unpredictable weather including snow, hail, sleet, thunder and lightning.
Anyone with information should call (970) 586-1204.
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