Dunn, a 56-year-old guide and director for Ashford’s International Mountain Guides, originally planned to make the historic climb Friday morning but delayed the trip with friends and family a day.
He changed the date so he and his party could take part in a charity climb for the Washington National Parks Fund. The two groups will summit together.
Dunn’s party began climbing Thursday and spent Friday at Ingraham Flats, elevation 11,800 feet. They planned to begin their summit push shortly after midnight Friday.
Dunn climbed Rainier for the first time in the late 1960s. He started guiding for RMI in 1975. In 1976, he set a record by climbing the 14,411-foot mountain 30 times.

