Snow covers much of the park mid-October through mid-June. The Park Road (the main road that connects Hwy. 89 through the Park) is usually closed late October through mid-June. During years of heavy snowfall, the road may open significantly later. Please call the Park for road and trail condition updates. Many of the main park attractions are snow covered and inaccessible by car and foot during the winter. The months of July, August, and September may bring mostly sunny skies with warm daytime temperatures and cool nighttime temperatures. For the area forecast, click on the link below.