Alamosa is a small town in south central Colorado, USA. It is noteworthy as the nearest significant town to Great Sand Dunes National Park, a similarly near neighbor of the eastern hub of a superb scenic railroad, and also because during the winter, it frequently records the lowest temperature of the day of any place in the contiguous United States. Alamosa is at the intersection of US highways 160 and 285, about 230 road miles from Denver. (The straight-line distance is considerably less, but the rugged Sangre de Cristo Mountains deter traffic.) Limited commuter air service exists between Denver and Alamosa, with about three flights daily each way.