There is far more than one state in North America's Mountain Time Zone. It includes...
part of Nunavut, Canada
Northwest Territories, Canada
parts of British Columbia, Canada
Alberta, Canada
the area around Maidstone, Saskatchewan, Canada
Montana, USA
20% of North Dakota, USA
75% of Idaho, USA
44% of South Dakota, USA
Wyoming, USA
8% of Oregon, USA
30% of Nebraska, USA
Utah, USA
Colorado, USA
West Wendover, Nevada, USA
5% of Kansas, USA
Arizona, USA
New Mexico, USA
Sonora, Mexico
2% of Texas, USA
Chihuahua, Mexico
Baja California Sur, Mexico
Sinaloa, Mexico
Nayarit, Mexico
the eastern Revillagigedo Islands (Mexico)
Most of the Mountain Time Zone observes Daylight Saving Time (DST). Parts of British Columbia, 84% of Arizona, Sonora, and the eastern Revillagigedo Islands do not. Canada, the United States, and the Mexican cities of Juarez and Ojinaga in Chihuahua observe DST from the second Sunday of March until the first Sunday of November. Most of Mexico observes DST from the first Sunday of April until the last Sunday of October.
Denver (and the entire state of Colorado)'s time zone is Mountain Standard Time.
The Pacific Time Zone is west of the Mountain Time Zone.
The Central Time Zone is east of the Mountain Time Zone.
The majority of North Dakota is in the Central time zone. The southwest corner of the state is in the Mountain time zone.
Officially the entire state is in the Central time zone. Unofficially, only the Kenton area at the western end of the panhandle observes Mountain Time.
The entire state of Wyoming is in Mountain Time Zone.
The majority of Nebraska is in the Central time zone. Much of the western half of the state is in the Mountain time zone.
Denver (and the entire state of Colorado)'s time zone is Mountain Standard Time.
Montana
The whole state is in the Mountain Time Zone.
Denver (and the entire state of Colorado)'s time zone is Mountain Standard Time.
The whole U.S. state of Montana is in the Mountain Time Zone (UTC-7/UTC-6).
The Pacific Time Zone is west of the Mountain Time Zone.
The Pacific Time Zone is west of the Mountain Time Zone.
The Central Time Zone is east of the Mountain Time Zone.
The majority of North Dakota is in the Central time zone. The southwest corner of the state is in the Mountain time zone.
Idaho is in two time zones. The panhandle area of northern Idaho is in the Pacific Time Zone. The rest of the state is in the Mountain Time Zone.