Toad Time Boreal toads are Colorado's only alpine species of toad that reside between 8,500 and 11,500 feet and are listed as endangered in Colorado. For more than 30 years, we've devoted significant resources toward boreal toad research and continue to explore ways to recover this species. Most recently, we worked with the Denver Zoo Conservation Alliance on a multi-year initiative to release more boreal toads into the wild. #WildlifeWednesday | Colorado Parks and Wildlife