2012 Primary Calendar
The schedule of primaries and caucuses is shown below with the next state to vote indicated in red. Click on the name of the state to see the results for each candidate.
| Date | State and type of vote | Winner |
| 3 January | Iowa (caucus) | Santorum |
| 10 January | New Hampshire (primary) | Romney |
| 21 January | South Carolina (primary) | Gingrich |
| 31 January | Florida (primary) | Romney |
| 4 February | Nevada (caucus) | Romney |
| 4-11 February | Maine (caucus) | Romney |
| 7 February | Colorado (caucus) | Santorum |
| Minnesota (caucus) | Santorum | |
| Missouri (primary) | Santorum | |
| 28 February | Arizona (primary) | Romney |
| Michigan (primary) | Romney | |
| 29 February | Wyoming | Romney |
| 3 March | Washington (caucus) | Romney |
| 6 March | Alaska (caucus) | Romney |
| Georgia (primary) | Gingrich | |
| Idaho (caucus) | Romney | |
| Massachusetts (primary) | Romney | |
| North Dakota (caucus) | Santorum | |
| Ohio (primary) | Romney | |
| Oklahoma (primary) | Santorum | |
| Tennessee (primary) | Santorum | |
| Vermont (primary) | Romney | |
| Virginia (primary) | Romney | |
| 10 March | Kansas (caucus) | Santorum |
| Virgin Islands (caucus) | Romney | |
| Guam (caucus) | Romney | |
| Northern Marianas (caucus) | Romney | |
| 13 March | Alabama (primary) | Santorum |
| Hawaii (caucus) | Romney | |
| Mississippi (primary) | Santorum | |
| American Samoa (Caucus) | Romney | |
| 18 March | Puerto Rico (primary) | Romney |
| 20 March | Illinois (primary) | Romney |
| 24 March | Louisiana (primary) | Santorum |
| 3 April | District of Columbia (primary), Maryland (primary), Wisconsin (primary) | Romney |
| 24 April | Connecticut (primary), Delaware (primary), New York (primary), Pennsylvania (primary), Rhode Island (primary) | Romney |
| 8 May | Indiana (primary), North Carolina (primary), West Virginia (primary) | Romney |
| 15 May | Nebraska (primary), Oregon (primary) | Romney |
| 22 May | Arkansas (primary), Kentucky (primary) | Romney |
| 29 May | Texas (primary) | Romney |
| 5 June | California (primary), Montana (primary), New Jersey (primary), New Mexico (primary), South Dakota (primary) | Romney |
| 26 June | Utah (primary) |