⛰️ Summary of MT (Mountain Time)

The Mountain Time Zone (MT) of North America keeps time by referencing the Rocky Mountains. It is observed in parts of the United States, Canada, and Mexico.

Key Points

• Offsets (DST): Standard time is MST (UTC−07:00) and daylight time is MDT (UTC−06:00) in regions that observe DST.
• DST Schedule (US/Canada): Daylight Saving Time runs from the second Sunday in March to the first Sunday in November in areas that observe it.
• Exceptions (Arizona & Sonora): Most of Arizona (including Phoenix) stays on MST (UTC−07:00) year-round; the Navajo Nation observes DST. In Mexico, the state of Sonora also remains on UTC−07:00 all year.
• Usage Area (US): Fully covers Arizona, Colorado, Montana, New Mexico, Utah, and Wyoming. Portions of Idaho, Oregon (Malheur County), Kansas, Nebraska, North Dakota, South Dakota, Texas, and small areas of Nevada also observe Mountain Time.
• Usage Area (Canada): Used in Alberta, parts of British Columbia, and in the city of Lloydminster and surrounding area on the Alberta–Saskatchewan border.
• Usage Area (Mexico): UTC−07:00 applies in Baja California Sur, Sinaloa, Sonora, and most of Nayarit (Bahía de Banderas follows Central Time). Since October 2022, Mexico abolished DST in most of the country; only select northern border municipalities still observe DST aligned with the U.S.

Source: Wikipedia