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I will be up at Rainier in mid September - any advice on place to go and see? We are staying at Paradise Inn so I did want to hit up Reflection lake and this depending on where it is in the park.
Mid September you should start to see some huckleberry turning red up in the high country - Chinook Pass and the eastern half of Paradise (particularly around Edith Creek) are the best places to start for that, and maybe some of the Mountain Ash will be leaning toward orange by then too, but usually the best color up at Rainier hits in October so you may be a bit early for it. Flowers will almost certainly be done by then, though the Monkeyflower seems to be late this year so you might be able to find some of that lingering around the streams at higher elevations - try the upper crossings of the Paradise River and Edith Creek on the Skyline Trail (go out to Myrtle Falls and Edith Creek, then take the first left after the creek and climb all the way up).
Reflection Lakes are always generally pretty good, and there may be some decent hints of color changing there too, but be aware that there is some serious road construction going on through the end of this season, and there might be disruptions in the Reflection Lakes area (it was all open and accessible when I was up there about a month ago though). You may want to try out Bench Lake too - a very underrated spot and easy to get to.