Primary Elections
Oklahoma Primary Elections 2026
Primary date, filing deadlines, key contested races, and what to watch in Oklahoma ahead of the 2026 general election.
June 23, 2026
Primary Date
August 25, 2026
Runoff / RCV
April 2026
Filing Deadline
Moderate — Governor open seat
Competitiveness
Key 2026 Primary Races
| U.S. Senate | Jim Inhofe retired; Markwayne Mullin (R) up 2026 |
| Governor | Kevin Stitt (R) is term-limited — open seat |
| U.S. House | OK-5 (Stephanie Bice) competitive |
2026 Primary Overview
Oklahoma uses a primary runoff system. Kevin Stitt is term-limited as governor, creating a competitive Republican primary for the open seat. Mullin faces Senate re-election. OK-5 is the most competitive district.