| January 3: | Iowa caucuses |
| January 5: | Wyoming caucuses (R) |
| January 8: | New Hampshire primary |
| January 15: | Michigan primary |
| January 19: | Nevada caucuses |
| South Carolina primary (R) | |
| January 26: | South Carolina primary (D) |
| January 29: | Florida primary |
| February 1: | Maine caucuses (R) |
| February 5: | Super Tuesday |
| Alabama primary | |
| Alaska caucuses | |
| Am. Samoa caucuses | |
| Arizona primary | |
| Arkansas primary | |
| California primary | |
| Colorado caucuses | |
| Connecticut primary | |
| Delaware primary | |
| Georgia primary | |
| Idaho caucuses (D) | |
| Illinois primary | |
| Kansas caucuses (D) | |
| Minnesota caucuses | |
| Missouri primary | |
| Montana caucuses | |
| New Jersey primary | |
| New Mexico primary (D) | |
| New York primary | |
| North Dakota caucuses | |
| Oklahoma primary | |
| Tennessee primary | |
| Utah primary | |
| W. Virginia convention | |
| February 5-12: | Democrats Abroad |
| February 9: | Kansas caucuses (R) |
| Louisiana primary | |
| Nebraska caucuses | |
| Virgin Islands caucuses | |
| Washington caucuses | |
| February 10: | Maine caucuses (D) |
| February 12: | D.C. primary |
| Maryland primary | |
| Virginia primary | |
| February 19: | Hawaii caucuses (D) |
| Washington primary | |
| Wisconsin primary | |
| February 24: | Puerto Rico primary |
| March 4: | Massachusetts primary |
| Ohio primary | |
| Rhode Island primary | |
| Texas primary | |
| Vermont primary | |
| March 8: | Wyoming caucuses (D) |
| March 11: | Mississippi primary |
| April 22: | Pennsylvania primary |
| May 3: | Guam caucuses |
| May 6: | Indiana primary |
| North Carolina primary | |
| May 13: | Nebraska primary |
| West Virginia primary | |
| May 17: | Hawaii convention |
| May 20: | Kentucky primary |
| Oregon primary | |
| May 27: | Idaho primary (R) |
| June 3: | Montana primary |
| New Mexico primary (R) | |
| South Dakota primary | |
| June 28: | Nebraska convention |
