Visitation declined at Rocky Mountain National Park in 2023 for the second straight year, and its ranking on the list of busiest national parks fell from fourth to fifth behind Great Smoky Mountains, Grand Canyon, Zion and Yellowstone according to figures released by the National Park Service. Visitation at Rocky in 2023 was 4,115,837, a 4% decline over the previous year and 7% below 2021 figures.