We drove up to Mirror Lake last year and it looked amazing. When you go, do you reserve sites way in advance? Online it’s already booked up for most of the year.
I camp up in that area every year. I would reserve in advance. I’ve gone up multipule times last minute and had to find pull off spots off the highway. Some campgrounds book up months in advance. Get’s cold at night and you can expect thundershowers nearly every afternoon in the summer.
if you go, about 2-3 miles past Mirror Lake towards Evanston is the Pass Lake trail-head where you can hike the Lofty Lake Loop.
As God is my witness that is one of the most gorgeous hikes in the world, its about 5 hours of lakes and streams and alpine awesomeness. I hiked it again in August last year and we saw 5 people in 5 hours.