If you hike in the Wasatch between June-August, you can't miss seeing any of these flowers. If you miss a earlier bloom, don't worry, just head a bit higher and you'll find the bloom is still strong. I've been seeing these flowers as early as March is southern Utah. Up in the Wasatch, you'll see the best show around the first week of August.
My favorite spot for flowers is up around Cecret Lake because the colorful reflections on the water are priceless.