I'm sure you will check the park website before you head out because things can always change but when we were there last weekend, the roads were clear on the way and in the valley. The park had just reopened after the big storm so some services were curtailed (on top of the usual limited service in winter) but the shuttle ran, enough food places were open - all in all, it was fantastic. Lots of trails were snowed in, but popular ones like mirror lake were doable. I hope you have a wonderful time!