Tags: Mountain Range.
The Boulder Mountains are 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 8819 feet (2688 m) is the tallest peak in the range. The three other highest peaks are Jack Mountain at 8752 feet (2668 m) Bull Mountain at 8609 feet (2624 m) and Thunderbolt Mountain at 8597 feet (2620 m).