Along the Mississippi River Flyway in Iowa, Port Louisa National Wildlife Refuge provides important habitat for migratory birds. Floodplains and forests are used by many wildlife species including migratory songbirds, waterfowl, hawks and eagles, deer, small mammals, reptiles and amphibians. After a recent snowstorm, it’s also a stunning winter sight. Photo by Jessica Bolser, U.S. Fish and Wildlife Service.

Bring skis, snowshoes or sleds to enjoy snowy winters at Lassen Volcanic National Park in northern California. From January through April, ranger-led snowshoe walks are a great way to explore this volcanic landscape. Over 75 percent of the park is designated as wilderness, offering unparalleled opportunities for solitude and adventure. Photo by National Park Service.

Moonlight brightens snowy dunes at Great Sand Dunes National Park and Preserve in Colorado. Experience the park after dark by stargazing, listening for owls along the foothills or going for a full moon walk on the dunes. Cold temperatures are the norm in winter, so bundle up with warm clothing and sturdy footwear for an unforgettable nighttime adventure. Photo by Patrick Myers, National Park Service.