Elevations in the Park range from 700 feet above sea level to over 8,000, providing a wide range of climatic conditions, that follow the four seasons.
Be prepared for very warm weather in the summer months, in particular in the river valleys. The spring and fall are moderate and comfortable. Winter conditions can be severe in the higher elevations, with snow and ice making travel difficult and dangerous.
Did You Know?
In September of 1805 Lewis and Clark crossed into Nez Perce country. A debate ensued among the Nez Perce. Should they assist these strangers or attack them? A female Nez Perce elder, Wetxuuwíis (Wet-k'hoo-wees)urged her people to do them no harm. Her words were heeded; the expedition was welcomed.