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You can still get flowers August 17th, but some of the park will be past prime by then. Sunrise/Grand Park usually bloom first, followed by Spray/Seattle Park and then Paradise. My buddy just came back from the Sunrise area and said that he thinks another week or so before it blooms - but it is raining up there right now until this weekend.
I am heading to Mt. Rainier next weekend. I was up there last year August 2nd and flowers were past prime at Sunrise (Sunrise is the highest point in which you can drive to - 7K feet or so). Paradise was prime by then. This year I will be there July 31st through August 3rd - shorter time but going with my wife.
Some places to check on reports.. check the LAST post on