8 a.m. ET

Alabama

Arizona

Iowa

Minnesota

Mississippi

North Dakota

Oklahoma

South Dakota

Texas

Wisconsin

8:30 a.m. ET

Arkansas

9 a.m. ET

Colorado

Montana

Nebraska

New Mexico

Oregon

Utah

Wyoming

10 a.m. ET

Alaska (earliest poll opens at 7 a.m. local time for the small section that's in the Pacific Time Zone)

California

Idaho