Wyoming time zone and daylight saving time

Mountain Time Next clock change: Nov 1

Cheyenne, UTC−6Sunrise 7:27 a.m. · Sunset 5:58 p.m. · 10 h 31 min of daylight

Wyoming at a glance

Time zone
Mountain
Daylight saving time
Observed. UTC−6 in summer, UTC−7 in winter.
Upcoming clock changes
  • Sunday, November 1, 2026: clocks fall back
  • Sunday, March 14, 2027: clocks spring forward
  • Sunday, November 7, 2027: clocks fall back
  • Sunday, March 12, 2028: clocks spring forward
Each change happens at 2:00 a.m. local time.
Permanent daylight time law
Enacted in 2020 (with conditions). It needs federal approval before it can take effect.

All of Wyoming uses Mountain Time and observes daylight saving time: UTC−6 in summer and UTC−7 in winter.

Time zones in bordering states

Wyoming is surrounded by the Mountain Time parts of its six neighbours, so its time matches across every border, all year.

Select a state on the map to see its time zone details.

Time zone map of Wyoming and surrounding states. Each state is a link to its page.Counties are shaded by time zone. Hatched counties are split between two zones; dotted areas do not observe daylight saving time.ColoradoKansasNorth DakotaSouth DakotaMontanaUtahNebraskaIdahoNevada

Current time in each zone

  • Central
  • Mountain
  • Pacific

County split between two zones; the exact line isn't drawn

  • Montana, Colorado and Utah: same time all along the border.
  • Idaho: same time; eastern Idaho uses Mountain Time.
  • South Dakota and Nebraska: same time; western South Dakota and western Nebraska use Mountain Time.

What permanent time would mean for Wyoming

Ending clock changes would mean keeping one time all year: either permanent daylight time or permanent standard time. Here’s how each would shift sunrise and sunset in Cheyenne.

Permanent daylight time

Later winter mornings

8:21 a.m.

Sunrise on the shortest day, December 21 (now 7:21 a.m.).

Winter sunset: 5:34 p.m. (now 4:34 p.m.).

Permanent standard time

Earlier summer evenings

7:35 p.m.

Sunset on the longest day, June 21 (now 8:35 p.m.).

Summer sunrise: 4:27 a.m. (now 5:27 a.m.).

Times for Cheyenne, calculated for 2026. Actual sunrise and sunset can differ by a few minutes with terrain and weather.

Wyoming and permanent daylight time

In 2020, Wyoming enacted a law (House Bill 44) to observe Mountain Daylight Time year-round. It takes effect only if Congress allows it and at least four “western states,” including Wyoming, pass laws for year-round daylight time. The law defines western states as Colorado, Idaho, Montana, Nebraska, North Dakota, South Dakota, Utah and Wyoming. Colorado, Idaho, Montana and Utah have since enacted such laws. Wyoming is among the 19 states the Congressional Research Service lists as having done so.

Any switch to permanent daylight time would need Congress to act first. The U.S. House passed the Sunshine Protection Act in July 2026, and it is now with the Senate.

Common questions

What time zone is Wyoming in?

All of Wyoming uses Mountain Time and observes daylight saving time.

Is all of Yellowstone National Park on the same time?

Yes. The park extends into Montana and Idaho, but all of it is in the Mountain Time zone.

Didn’t Wyoming pass a law to stop changing clocks?

Wyoming passed a law in 2020, but it takes effect only if Congress allows it and enough western states do the same. Until then, clocks keep changing.

Sources: Wyoming Legislature; U.S. Department of Transportation (49 CFR Part 71); Congressional Research Service; Congress.gov.

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