Okla. Stat. tit. 26, § 26-20-101: Date of primary - Other elections prohibited

A. A Presidential Preferential Primary for recognized political

parties shall be held on the first Tuesday in March in each of the

years in which the President and Vice President of the United States

are to be elected.

B. If one or more states having a mutual boundary with this

state establish a single date for a regional primary, the State

Election Board is authorized to change the date of the Oklahoma

primary to the date established for the regional primary, as long as

the date is not before the first Tuesday in March.

C. No county, municipality, school district or other entity

authorized by law to call elections shall schedule an election on

any date during the twenty (20) days immediately preceding the date

of any such Primary Election. However, this subsection shall not

apply to home rule municipalities.