Hiked Summit Lake on 10/6/18. Saw about 20-25 people the whole day. Lots of dogs on leash including ours. The trail is very well maintained. This is one of my absolute favorite hikes! We started up later in the day, hitting the trailhead around 12:30pm. We met people coming down who didn't have the opportunity to see Mt. Rainier earlier in the day. Our late start meant we were able to get some gorgeous peek-a-boo views of the Mountain when we reached the trail summit. Perfect day!! Yes, the road up is rough, but the parking lot was full so it is definitely not deterring anyone. Please remember to pack your trash out.