US Time Zones at a Glance
The contiguous United States spans four primary time zones, moving from east to west: Eastern, Central, Mountain, and Pacific. Alaska and Hawaii each occupy their own zones — Alaska Standard Time (AKST) is UTC−9, and Hawaii-Aleutian Standard Time (HAST) is UTC−10. That's a maximum six-hour spread from Hawaii to the East Coast during standard time — a meaningful detail when you're scheduling calls or catching a flight connection.
| Number of US time zones (including territories) | 9 (6 covering the 50 states) (US Naval Observatory) |
| States that do not observe DST | Hawaii and most of Arizona (US Department of Transportation) |
| Easternmost interstate entry point (East Coast) | I-95 corridor, Maine–New Hampshire border |
| Longest contiguous US interstate | I-90, spanning ~3,020 miles from Seattle, WA to Boston, MA (Federal Highway Administration) |
| Peak hurricane season (Southeast/Gulf) | August–October (highest storm activity) (NOAA National Hurricane Center) |
| Time difference: Hawaii to New York (standard time) | 5 hours behind Eastern Standard Time (US Naval Observatory) |
Daylight Saving Time (DST) shifts most of the country forward one hour in spring and back in fall, but Arizona (except the Navajo Nation) and Hawaii do not observe DST. If you're driving from Nevada into Arizona in summer, don't assume your phone's auto-clock tells the full story — verify locally. For long road trips spanning multiple zones, practical trip-planning guidance can help you build accurate driving schedules and rest stops.
Major Interstate Entry Points by Region
Entering a new state by car almost always happens along an interstate corridor. Here's a quick regional breakdown of the most-traveled gateway routes:
- Northeast: I-95 is the spine of the East Coast, carrying travelers from Florida through the Mid-Atlantic into New England. Key state crossings include the Delaware Memorial Bridge (NJ–DE) and the George Washington Bridge (NJ–NY).
- Southeast: I-20 and I-85 funnel traffic deep into Georgia and the Carolinas. I-10 connects Florida's panhandle westward through Alabama, Mississippi, and Louisiana.
- Midwest: I-80 cuts straight across Iowa and Illinois; I-90 links Chicago to the Great Lakes corridor heading toward Wisconsin and Minnesota.
- Southwest: I-40 (the modern Route 66 corridor) crosses New Mexico and Arizona. I-10 continues as a southern artery from Texas to Southern California.
- Mountain West: I-70 climbs through the Rockies between Kansas and Utah; I-15 runs from Montana through Nevada into Southern California via Las Vegas.
- Pacific Northwest: I-5 is the primary north-south corridor through California, Oregon, and Washington, linking Seattle to San Diego.
Before any long interstate journey, brush up on regional road rules. Our road rules reference covers speed limits, lane laws, and state-specific regulations worth knowing before you cross a new state line.
Regional Seasons: When to Go (and What to Expect)
The US is vast enough that "peak season" means something completely different depending on where you're headed. Use this as a starting compass:
Standard Time
The base time offset a region keeps relative to Coordinated Universal Time (UTC) when Daylight Saving Time is not in effect. In the US, this runs from the first Sunday in November to the second Sunday in March.
Daylight Saving Time (DST)
A seasonal practice of advancing clocks one hour in spring to extend evening daylight. Most US states observe DST; Hawaii and most of Arizona do not.
Shoulder Season
The period between a destination's peak and off-seasons, typically offering fewer crowds and more moderate weather, often considered the most practical time to visit.
Interstate Entry Point
A major highway crossing where a traveler transitions from one US state into another, typically marked by a welcome sign, rest area, or change in speed limit and road rules.
UTC Offset
The number of hours a given time zone is ahead of or behind Coordinated Universal Time (UTC), the global standard for timekeeping. Eastern Standard Time is UTC−5; Pacific Standard Time is UTC−8.
- Northeast & New England
- Peak season runs June–August for coastal destinations and late September–October for fall foliage. Winters are cold and snowy; spring (April–May) is quiet and affordable. New England's coastal geography shapes travel timing significantly — ferry schedules and tidal access shift by season.
- Southeast & Gulf Coast
- Fall (October–November) and spring (March–April) are the sweet spots — mild temperatures and smaller crowds. Summer brings intense heat and humidity; hurricane season officially runs June through November.
- Mountain West
- Summer (July–August) is prime for hiking and national parks, though elevation can create surprise weather at any time. Ski season peaks December–March. Travelers should understand what altitude actually does to your plans before heading into high country.
- Southwest & Desert States
- Spring (March–May) and fall (September–November) offer the most comfortable temperatures. Summers can exceed 110°F in places like Phoenix and Death Valley — not impossible to visit, but demanding. National parks in this region shine in shoulder seasons; see what makes each park region distinct for more detail.
- Pacific Coast
- Northern California, Oregon, and Washington see their driest, warmest weather July–September. Southern California enjoys a longer mild window, roughly April–October, though summer coastal fog ("June Gloom") is common near Los Angeles.
- Alaska & Hawaii
- Alaska's peak visitor window is mid-May through early September; winters are for aurora chasers and cold-weather adventurers. Hawaii is welcoming year-round, with peak demand during December–March and June–August. Note that crossing multiple time zones on these trips can affect your sleep — how time shifts affect your body clock applies even on domestic long-haul flights.
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