Every US Time Zone Explained: A State-by-State Breakdown

Quick answer: The United States spans six standard time zones: Eastern (UTC−5), Central (UTC−6), Mountain (UTC−7), Pacific (UTC−8), Alaska (UTC−9), and Hawaii-Aleutian (UTC−10). Most states sit cleanly in one zone, but thirteen states are split across two, and two states - Arizona and Hawaii - don't observe Daylight Saving Time. This guide breaks down which zone each state falls in, the exceptions, and why the boundaries zig-zag the way they do.

Convert any US city instantly: Open BestSyncTime with any two American cities to see the offset live - it handles the split states and the Arizona DST quirk automatically.

The six US time zones

Working from east to west, here are the mainland-and-beyond zones, with their standard-time offsets from UTC (the daylight-time offset is one hour later in observing areas):

*Hawaii itself does not observe DST, so it stays on HST year-round; the Aleutian Islands in Alaska do observe it.

That's a five-hour spread across the contiguous US (Eastern to Pacific), stretching to a full six hours once Hawaii is included - meaning when it's 6 PM in New York, it's 1 PM in Honolulu.

The clean single-zone states

Most states fall entirely within one zone. The big groupings:

Eastern (UTC−5): Includes the entire East Coast and much of the Midwest - New York, New Jersey, Pennsylvania, Ohio, Georgia, the Carolinas, Virginia, Massachusetts, Connecticut, Maine, and more.

Central (UTC−6): The heart of the country - Texas (mostly), Illinois, Louisiana, Missouri, Minnesota, Wisconsin, Iowa, Arkansas, Alabama, Mississippi, and others.

Mountain (UTC−7): Colorado, Utah, Wyoming, Montana, New Mexico, and - with its own twist - Arizona.

Pacific (UTC−8): California, Washington, Oregon, and Nevada.

Alaska (UTC−9): Nearly all of Alaska.

Hawaii-Aleutian (UTC−10): Hawaii, plus the far-western Aleutian Islands.

The split states: where a state spans two zones

Thirteen states are divided by a time zone boundary, which is a frequent source of confusion for travelers and businesses. The line usually follows a river, a county border, or a historical rail division. The notable splits:

• - Florida - mostly Eastern, but the western panhandle (around Pensacola) is Central.
• - Indiana - mostly Eastern, with a few northwestern and southwestern counties on Central (near Chicago and Evansville).
• - Kentucky and Tennessee - both split Eastern/Central roughly down the middle.
• - Michigan - mostly Eastern, with four Upper Peninsula counties on Central.
• - Texas - overwhelmingly Central, but El Paso and a neighboring county sit in Mountain.
• - Kansas, Nebraska, South Dakota, North Dakota - each split Central/Mountain, with the western portions on Mountain.
• - Oregon - mostly Pacific, but most of Malheur County in the east is Mountain.
• - Idaho - split Mountain (south) / Pacific (north).
• - Alaska - mostly Alaska time, with the western Aleutians on Hawaii-Aleutian time.

If you're scheduling with someone in a split state, the state name alone isn't enough - you need the city.

The DST exceptions: Arizona and Hawaii

Two states opt out of Daylight Saving Time entirely, staying on standard time all year:

Arizona doesn't spring forward. In a state where summer evenings are brutally hot, an extra hour of evening daylight is the opposite of what residents want - it just extends the hottest part of the day. So Arizona keeps Mountain Standard Time year-round, which means for half the year it effectively matches Pacific Daylight Time (California). There's a twist inside the twist: the Navajo Nation, which extends into Arizona, *does* observe DST (to stay consistent across its territory in Utah and New Mexico) - while the Hopi Reservation, entirely surrounded by the Navajo Nation, does *not.* The result is a small area with alternating observance depending on which land you're standing on.

Hawaii also skips DST, for a different reason: it's close to the equator, so its daylight hours barely change across the seasons. With little seasonal variation to exploit, shifting the clock would serve no purpose. Hawaii stays on Hawaii-Aleutian Standard Time all year.

Several US territories also stay on standard time year-round: Puerto Rico, the US Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands.

Why the boundaries zig-zag

Time zone lines in the US aren't straight meridians. They bend around state lines, county borders, and city limits - because the zones are set by the Department of Transportation based partly on commercial and community ties, not pure geography. A town that does most of its business with a neighboring city in another zone will often petition to share that city's time. Over the decades, this has produced the jagged boundaries we have today, with occasional oddities like a single county choosing to differ from its neighbors.

The practical upshot: you genuinely cannot infer a US location's time zone from a map with confidence. Border regions require checking the specific city.

How the offsets shift with DST

For the states that observe DST, remember that every offset in the first table moves one hour *closer to UTC* during daylight time (roughly mid-March to early November in 2026 - the US changes on March 8 and November 1). So Eastern goes from UTC−5 to UTC−4, Pacific from UTC−8 to UTC−7, and so on.

The internal five-hour spread across the contiguous US stays constant during those months (everyone shifts together), *except* where Arizona doesn't move - which means during DST, Arizona (staying at UTC−7) matches California's clock (PDT, UTC−7) rather than the Mountain states around it. That's the single most common US time-zone gotcha for anyone scheduling with Phoenix.

Quick reference: what time is it across the US?

When it's 12:00 noon Eastern, it's: - 11:00 AM Central - 10:00 AM Mountain - 9:00 AM Pacific - 8:00 AM Alaska - 7:00 AM Hawaii

(During DST months, the Hawaii and Arizona relationships shift as described above - another reason to verify rather than assume.)

The bottom line

The US has six time zones spanning five hours across the mainland and six including Hawaii. Most states sit in one zone, but thirteen are split - so border cities need checking - and Arizona and Hawaii sit out DST entirely, with the Navajo/Hopi patchwork making Arizona especially tricky. The boundaries follow community and commercial ties rather than clean meridians, which is why you can't reliably guess a location's zone from a map. When it matters, check the city, not just the state.

Skip the lookup: Open BestSyncTime, enter any two US cities, and read the exact current offset - split states and the Arizona quirk already handled.