This is by far the most beautiful hike I have ever been on. It's pretty busy, so get there early to have more of the trail to yourself. It is rocky as others state, but my dog and I were totally fine. Oh - and the hike description here says no dogs, but there were dogs up there, and I asked at the ranger kiosk, and they said leashed dogs are fine.
We hiked this July 11th, 2016. It's a moderate hike up until you have to cross the river. After that we were climbing 3 ft snow banks especially the last 1-1.5 miles. Definitely possible without snowshoes. We started at 9:30am & made it there at 2:30ish. There were about 10 other people when we made it up. Stayed the night at a campsite nearby. Totally worth the view. The next day it took us 4 hours to trek back down & I was SO happy to see the car. My advice: make this a weekend trip & enjoy the hot springs because this hike was strenuous!