49 CFR Part 71 — Standard Time Zone Boundaries

Daylight Saving Time

IANA tzdb zone1970.tab

Uniform Time

Time Zone Database Release 2026d

Wyoming follows the federal daylight-saving schedule.

U.S. Census Bureau TIGERweb Incorporated Places (ACS 2026)

town

city

Wyoming

Wyoming has 99 Census-recognized incorporated places as of January 1, 2026, including 80 towns and 19 cities.

All of Wyoming is legally in Mountain Time.

Wyoming is entirely in Mountain Time and observes daylight saving time statewide.

Most Mountain Time areas advance to UTC-06:00 for daylight saving time. Most of Arizona remains on UTC-07:00 year-round; the Navajo Nation observes daylight saving time.

Mountain Time

Mountain Time covers much of the interior West. Its normal offsets are UTC-07:00 in standard time and UTC-06:00 in daylight time, with the important Arizona exception.

Time Zones in Wyoming

Time-zone coverage

Mountain Time

Daylight saving time in Wyoming

Check an address near a boundary