CDT – Central Daylight Time / Central Daylight Saving Time (Daylight Saving Time)

U.S. states using CDT in the summer and CST in the winter:

• Alabama
• Arkansas
• Florida - North-West parts Show

  Bay, Calhoun, Escambia, Holmes, Jackson, Okaloosa, Santa Rosa, Walton and Washington counties and norther Gulf county

• Illinois
• Indiana - these few north-western counties near Chicago (Lake, Porter, La Porte, Newton, Jasper, Starke) and these south-western counties in Indiana near Evansville Show

  Gibson, Posey, Vanderburgh, Warrick, Perry, Spencer

• Iowa
• Kansas - except these western counties Show

  Greeley, Hamilton, Sherman and Wallace - MST/MDT

• Kentucky - Western part Show

  Adair, Allen, Ballard, Barren, Breckinridge, Butler, Caldwell, Calloway, Carlisle, Christian, Clinton, Crittenden, Cumberland, Daviess, Edmonson, Fulton, Graves, Grayson, Green, Hansock, Hart, Henderson, Hickman, Hopkins, Livingston, Logan, Lyon, Marshall, McCracken, McLean, Metcalfe, Monroe, Muhlenberg, Ohio, Russell, Simpson, Todd, Trigg, Union, Warren and Webster counties

• Louisiana
• Michigan - A few western counties Show

  Dickinson, Gogebic, Iron, and Menominee

• Minnesota
• Mississippi
• Missouri
• Nebraska - Eastern parts Show

  All except Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes, Deuel, Dundy, Garden, Grant, Hooker, Keith, Kimball, Morrill, Perkins, Scotts Bluff, Sheridan, and Sioux counties and the western part of Cherry county which are on MST/MDT

• North Dakota - North and Eastern parts Show

  counties of Barnes, Benson, Bottineau, Burke, Burleigh, Cass, Cavalier, Dickey, Divide, Eddy, Emmons, Foster, Grand Forks, Griggs, Kidder, Lamoure, Logan, McHenry, McIntosh, McLean, Mountrail, Nelson, Oliver, Pembina, Pierce, Ramsey, Ransom, Renville, Richland, Rolette, Sargent, Sheridan, Steele, Stutsman, Towner, Traill, Walsh, Ward, Wells, Williams and northern parts of McKenzie and Dunn, westernmost part of Morton and Fort Yates in Sioux

• Oklahoma
• South Dakota - Eastern parts Show

  counties of Aurora, Beadle, Bon Homme, Brookings, Brown, Brule, Buffalo, Campbell, Charles Mix, Clark, Clay, Codington, Davison, Day, Deuel, Douglas, Edmunds, Faulk, Grant, Gregory, Hamlin, Hand, Hanson, Hughes, Hutchinson, Hyde, Jerauld, Jones, Kingsbury, Lake, Lincoln, Lyman, Marshall, McCook, McPherson, Mellette, Miner, Minnehaha, Moody, Potter, Roberts, Spink, Sanborn, Sully, Todd, Tripp, Turner, Union, Yankton, Walworth and eastern parts of Stanley

• Tennessee - Western part Show

  counties of Bedford, Benton, Bledsoe, Cannon, Carroll, Cheatham, Chester, Clay, Coffee, Crockett, Cumberland, Davidson, Decatur, DeKalb, Dickson, Dyer, Fayette, Fentress, Franklin, Gibson, Giles, Grundy, Hardeman, Hardin, Haywood, Henderson, Henry, Hickman, Houston, Humphreys, Jackson, Lake, Lauderdale, Lawrence, Lewis, Lincoln, McNairy, Macon, Madison, Marion, Marshall, Maury, Montgomery, Moore, Obion, Overton, Perry, Pickett, Putnam, Robertson, Rutherford, Sequatchie, Shelby, Smith, Stewart, Sumner, Tipton, Trusdale, Van Buren, Warren, Wayne Weakley, White, Willamson, Wilson

• Texas - All, but a few counties in west Show

  El Paso and Hudspeth and part of Culberson

• Wisconsin

Canadian provinces using CDT in the summer and CST in the winter:

• Manitoba
• Ontario - most parts west of 90 West. (Parts east of 90 West is on EST/EDT)
• Saskatchewan - only Creighton and Denare Beach

Mexican states using CDT in the summer and CST in the winter:

• Aguascalientes
• Campeche
• Chiapas
• Coahuila
• Colima
• Distrito Federal
• Durango
• Guanajuato
• Guerro
• Hidalgo
• Jalisco
• León
• Michoacán
• Morelos
• México
• Nuevo León
• Oaxaca
• Puebla
• Querétaro
• Quintana Roo
• San Luis Potosí
• Tabasco
• Tamaulipas
• Tlaxcala
• Veracruz
• Yucatán
• Zacatecas