Last updated on June 1, 2008. Red denotes Republican-only; blue denotes Democrat-only; Gray denotes primaries or caucuses already completed. Visit Declare Yourself for registration information.

January
3 – Iowa caucus
5 – Wyoming Republican Convention (50% RNC delegate cut)
8 – New Hampshire primary
15 – Michigan primary (100% DNC, 50% RNC delegate cuts)
19 – Nevada caucus
South Carolina Republican primary (50% RNC delegate cut)
26 – South Carolina Democratic primary
29 – Florida primary (100% DNC, 50% RNC delegate cuts)

February
1 – Maine Republican primary
5 – SUPER TUESDAY – 23 states hold primaries or caucuses

Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Georgia, Idaho caucus, Illinois, Kansas caucus, Massachusetts, Minnesota (caucus), Missouri, New Jersey, New Mexico caucus, New York, North Dakota, Oklahoma, Rhode Island, Tennessee, Utah

9 – Louisiana, Kansas, Nebraska caucus, Washington Caucus (half of Repub. WA delegates selected – info)
10 – Maine Caucus
12 – D.C., Maryland, and Virginia
19 – Hawaii, Wisconsin, Washington (half of Repub. WA delegates selected in primary – info)

March
4 – Ohio, Vermont, Rhode Island, Texas
8 – Wyoming
11 – Mississippi

April
22 – Pennsylvania

May
6 – Indiana and North Carolina
13 – Nebraska and West Virginia
17 – Maine
19 – Kentucky and Oregon
27 – Idaho