Lace up for this one-of-a-kind 5-mile adventure in Portage that combines running with Alaska Railroad history as you travel via the scenic Glacier Discovery Train to the remote Spencer Whistle Stop, then run along the Spencer Glacier Overlook Trail while witnessing a century of glacial change before heading back by train the same day. Early bird pricing runs through May 2 at $107 for adults and $63.50 for youth (ages 7-11), with costs increasing as you get closer to the June 7 race date, and spots are capped at 100 runners with registration closing May 24.