Great Sand Dunes and the short season of Medano Creek

Great Sand Dunes National Park and Preserve rises right at the eastern edge of the San Luis Valley, where the dunes pile up against the Sangre de Cristo Mountains. For people living near Alamosa, it is a close national park, and it has a rhythm worth knowing.

One of its best-known features, Medano Creek, is not there all year. The creek flows from snowmelt off the mountains, so it usually runs along the base of the dunes for a stretch of spring and early summer, then fades as the snowpack runs out. The exact timing shifts from year to year depending on how the winter went. Show up at the right window and there is a wide, shallow creek at the foot of the sand; show up later and it may be dry.

A few practical notes: the park charges an entrance fee, and federal interagency passes are accepted, so it helps to check what is current before you go. The sand can get very hot in summer afternoons, and weather in this high basin changes fast.

For current creek conditions, fees, and what is open, check the National Park Service page for Great Sand Dunes, the agency that manages the park.