Eastern Montana

Eastern Montana is a loosely defined region of Montana. Some definitions are more or less inclusive than others, ranging from the most inclusive, which would include the entire part of the state east of the Continental Divide, to the least inclusive, which places the beginning of "eastern" Montana roughly at or even east of Billings, Montana. The areas of Montana lying just east of the Continental Divide are often called Central Montana. A widely accepted definition of Eastern Montana is that it encompasses the eastern third of the state.

Parts of Eastern Montana are affected by the economic boom in the Bakken formation, the largest oil discovery in U.S. history.

The plains of eastern Montana were historically populated by Plains Indian tribes such as the Sioux, Blackfeet and Crow.

By the late 19th century, people of European descent set up homesteads in the region, and the Native Americans were mostly confined to Indian reservations as they were throughout Montana and the west. To this day, Eastern Montana has a proud Native American population.

Eastern Montana was the location of the Battle of the Little Bighorn.

Fort Peck Dam near Glasgow, Montana was a major project of the Public Works Administration, part of the New Deal. Construction of Fort Peck Dam started in 1933, and at its peak in July 1936 employed 10,546 workers. The dam, named for a 19th-century trading post, was completed in 1940, and began generating electricity in July 1943.

Eastern Montana has a semi-arid steppe climate with low precipitation that is to some extent countered by low evaporation rates. Typical precipitation is 10 to 20 inches (254.0 to 508.0 mm) mostly in the form of summer thunderstorms and snow, which can fall at any time of the year. Summers are short but hot and winters are long, cold and extremely variable. During some winters, such as 1925–26, 1930–31, 1960–61 and 1991–92, chinook winds descending from the Rockies cause frequent mild spells of 35 to 60 °F (1.7 to 15.6 °C) lasting up to several weeks. In contrast, other winters such as 1916–17, 1935–36, 1968–69 and 1978–79 see the westerly flow move further south and in this absence of chinooks, temperatures can stay below 0 °F or −17.8 °C for weeks at a time.

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