A rattlesnake is easily identified by its triangular-shaped head and the rattles on its tail, which gives you an obvious warning if you come near them, and they feel threatened.
Adult rattlesnakes usually won't emerge until April; however, it is sometimes possible to find a baby rattlesnake at lower elevations in any season. A baby rattlesnake may or may not have rattles, it may have a "button" on the tip of its tail, but it can be just as dangerous as its adult parent.