Boulder Mountains (Montana)
The Boulder Mountains is a mountain range running north–south west of Boulder between Helena and Butte in the U.S. state of Montana. Parts of the range are in four different counties: Deer Lodge, Jefferson, Lewis and Clark, and Silver Bow.
Haystack Mountain, which reaches, is the tallest peak in the range. The three other highest peaks are Jack Mountain at, Bull Mountain at, and Thunderbolt Mountain at. All four peaks are in Jefferson County.
