In 1998 Kellogg became the first person to climb and descend Mount Rainier in under five hours. He repeated the feat in 2004 when he ran from Paradise, Washington to the summit and back in 4 hours, 59 minutes. His record for the fastest climb has since been surpassed. Kellogg entered the 2003 Khan Tengri speed climbing competition in Kazakhstan, a race to climb the mountain, and won. He once held the record for the fastest ascent and descent on Mount McKinley's West Buttress route, making the round trip to the summit and back in 23 hours, 55 minutes; he was the first known person to ascend and descend in less than 24 hours. Kellogg made three attempts to break speed record on Mount Everest in 2010, 2011 and 2013, but never succeeded.