All US Time Zones

The most populous US time zone: the entire East Coast from Maine to Florida, plus Michigan, Indiana (mostly), and Kentucky's eastern half.

The Midwest and much of the South and central Plains, from Chicago and Dallas to New Orleans and Minneapolis, plus the Florida panhandle and El Paso's Texas neighbors further east.

The Rocky Mountain states — Colorado, Utah, Wyoming, Montana, and parts of Idaho, New Mexico, and Texas — plus Arizona, which uniquely stays on standard time year-round.

The West Coast — California, Oregon, Washington, and Nevada — plus most of Idaho's northern panhandle.

All of Alaska except the far western Aleutian Islands, which sit in the Hawaii-Aleutian zone.

Hawaii (no DST, permanent HST) and the far-western Aleutian Islands of Alaska (which do observe DST as HDT).

Puerto Rico and the US Virgin Islands.

American Samoa.

Guam and the Northern Mariana Islands.