US time zone map
Four zones across the mainland, six in total, and the interesting parts are the states the boundary runs through and the two that opt out of the clock change.
The short answer
Six zones. Eastern, Central, Mountain and Pacific across the mainland, plus Alaska and Hawaii–Aleutian.
Winter offsets run from UTC−5 on the east coast to UTC−10 in Hawaii.
The six
| Zone | Winter | Summer | Cities |
|---|---|---|---|
| Eastern | UTC−5 | UTC−4 | New York, Miami, Atlanta |
| Central | UTC−6 | UTC−5 | Chicago, Houston, Dallas |
| Mountain | UTC−7 | UTC−6 | Denver, Salt Lake City |
| Pacific | UTC−8 | UTC−7 | Los Angeles, Seattle |
| Alaska | UTC−9 | UTC−8 | Anchorage |
| Hawaii–Aleutian | UTC−10 | UTC−10 | Honolulu |
Counting territories adds more: Puerto Rico and the US Virgin Islands at UTC−4, Guam and the Northern Marianas at UTC+10, American Samoa at UTC−11.
The split states
The boundaries do not follow state lines. Thirteen states are divided between two zones, and the line usually follows county boundaries chosen for local commercial reasons.
Notable ones: Florida (the western panhandle is Central), Indiana (mostly Eastern, with north-western and south-western counties on Central), Kentucky and Tennessee (both split east–west), Texas (a far-western sliver around El Paso is Mountain), Oregon and Idaho (both split), and Nebraska, Kansas, North Dakota and South Dakota, each divided north–south or east–west.
Indiana is the most notorious: until 2006 most of the state did not observe daylight saving while parts did, producing a genuinely confusing patchwork that took federal intervention to resolve.
The two exemptions
Arizona does not observe daylight saving, except the Navajo Nation, which does. Hawaii does not.
This means Arizona changes which coast it matches: it aligns with Denver in winter and with Los Angeles in summer, without touching a clock. That makes Phoenix the trickiest US city to schedule against — see does Arizona observe daylight saving.
The coast-to-coast gap
Three hours between New York and Los Angeles, constant year-round because both change together.
Add Hawaii and the spread widens considerably: Honolulu is 5 hours ahead of New York in winter and 6 hours ahead in summer, since Hawaii does not change. A nationwide meeting including Hawaii has a genuinely narrow window.
When the map is wrong
Most printed US time zone maps show standard time. For the roughly 34 weeks between 2026-03-08 and 2026-11-01, every zone except Arizona and Hawaii is an hour off what the map says.
Related: Time zone map · What time zone is California in?
Timezone: World Clock Widget
A world clock, converter and live day/night map for iPhone — 325 cities, offline, no account.
Figures on this page are computed from the IANA time zone database. Last generated 2026-08-18.