3.24K viewsApril 18, 2022 0 wapiti816 April 18, 2022 0 Comments When does Chinook pass open? 1 Answer ActiveVotedNewestOldest 0 wapiti816 Posted April 18, 2022 0 Comments Chinook Pass SR 410 typically opens around Memorial day every year. Department of Transportation workers work diligently to open the pass when it is safe to do so. You are viewing 1 out of 1 answers, click here to view all answers. Login