powderpuff would be the best answer on this but we were there last year mid april they were still groooming boulder and frisby and parking in the parking lots ... check on the sledrevelstoke website they have frequent updates on there
Just back from a week riding in and around Revy. Trails to Boulder and Frisby will definitely hold up past April 15. The first 2 km of Streeter Street likely done after this weekend. Conditions were excellent spring riding. You had to go back and off the beaten path for powder. Our faces are glowing red from sunburn, ouch. All in all an excellent week.