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Wyoming, United States

Wyoming keeps Mountain Time statewide. It alternates between Mountain Standard Time and Mountain Daylight Time, so the current UTC offset depends on the season while Cheyenne, Casper, and the state’s other communities remain synchronized.

Cheyenne, United States

Friday, 4 September 2026

UTC−6 · America/Denver

Time and sun data for Cheyenne — the administrative centre of Wyoming

The sun in Cheyenne

Sunrise 06:30 Solar noon 13:00 Sunset 19:29 Daylight 12 h 59 min Night 11 h 01 min Civil twilight 06:02 – 19:57

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Current time in Wyoming, United States

Wyoming uses UTC−7 when standard time is in force. During daylight saving time, its clocks run at UTC−6. A reliable clock should display MST or MDT so that the active offset is unambiguous. The whole state follows the same civil time. Crossing Wyoming from the Black Hills side toward Yellowstone does not involve an internal time-zone change. Confusion can still arise near state borders because some neighboring areas use Central Time, while others share Wyoming’s Mountain Time.

When comparing Wyoming with another location, begin with the active UTC offset at both ends. Adding a fixed number of hours throughout the year can fail if the other place changes clocks on a different schedule or does not observe daylight saving time at all. Mountain Time measures the meeting; mountain weather may still rewrite the itinerary.

Cities on Wyoming’s clock

Cheyenne, the state capital, is also its largest city. Casper is another principal urban center. Gillette, Laramie, and Rock Springs are among the state’s other larger communities, and all five use identical time-zone rules.

Use Cheyenne as a practical reference for statewide business hours. Choose Casper or Gillette when a city-specific sunrise is needed in central or northeastern Wyoming. Select Laramie for local solar information in the southeast.

Use Rock Springs for a result closer to southwestern Wyoming. An appointment labeled “Wyoming time” is generally understandable within the United States, but “Mountain Time” is clearer. For international participants, providing the city, calendar date, and UTC offset removes uncertainty caused by abbreviations that may have other meanings elsewhere.

Reading Wyoming sunrise times

Sunrise varies across Wyoming even though the clocks do not. Eastern places generally reach sunrise earlier by local clock than western places. North-south position, elevation, mountains, and the observer’s horizon introduce further differences.

A calculated sunrise assumes a conventional unobstructed horizon. In a state of basins, ranges, plateaus, and deep valleys, direct sunlight can reach the ground later than the published astronomical event. Conversely, a person on an exposed high point may see the Sun sooner than someone below a nearby ridge.

Season is essential. Wyoming’s daylight span grows toward summer and contracts toward winter, so a sunrise value without a date is incomplete. For travel or outdoor work, consult the intended town rather than relying on Cheyenne merely because it is the capital. Civil twilight can be useful when the practical question is about available light rather than the exact sunrise instant.

Questions and answers

Which time zone does Wyoming use?
Wyoming uses Mountain Time: UTC−7 in standard time and UTC−6 during daylight saving time.
Is the time different in Cheyenne and Casper?
No. Both cities use the same statewide clock and change it seasonally together.
Does a published sunrise guarantee visible sunlight?
No. Mountains, buildings, trees, and clouds can delay the moment when the Sun becomes visible from a particular spot.
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