I've updated the wildflowers description and map Web pages for additional information about the wildflower season, adding a general time window, meaning after the normal snowpack, snowmelt and summer (July) weather, for the low, mid and upper elevations in Mt. Rainier NP.
Granted the wildflower season is still 3-4 months away, it's helpful to watch the signs ahead of time which is mostly when the peak and depth of the snowpack and the snowmelt. The snowmelt determines when the meadows become snow-free and the summer warmth and sunshine can do its magic and the flower bloom. After that it's a matter of watching the reports from the NP staff and photographers.
That's it for this update, and as always, more to come.