UTC−07:00

As standard time (Northern Hemisphere winter)

Canada (Mountain Time Zone)
- Nunavut
  - Kitikmeot Region
Mexico (near US border with New Mexico & western Texas)
- Chihuahua
  - Municipalities of Janos, Ascensión, Juárez, Práxedis G. Guerrero and Guadalupe
United States (Mountain Time Zone)
- Arizona – Navajo Nation only (most of Arizona uses MST year-round)
- Colorado
- Idaho
  - South of Salmon River
- Kansas
  - Western counties of Greeley, Hamilton, Sherman and Wallace
- Montana
- Nebraska
  - Western counties of Cherry (western part), Hooker, Arthur, Keith, Perkins, Chase and Dundy, and all counties to the west of these
- Nevada
  - West Wendover
- New Mexico
- North Dakota
  - Southwestern counties of Adams, Billings, Bowman, Dunn (southern part), Golden Valley, Grant, Hettinger, McKenzie (southern part), Sioux (west of ND route 31), Slope and Stark
- Oklahoma
  - Kenton
- Oregon
  - Malheur County (except a small strip in the south)
- South Dakota
  - Western counties of Corson, Dewey, Stanley (western part), Jackson and Bennett, and all counties to the west of these
- Texas
  - Western counties of Culberson (northwestern part), El Paso and Hudspeth
- Utah
- Wyoming

2 more chapters are free with a Lably account.