Okla. Stat. tit. 26, § 26-5-110: Filing period

Declarations of Candidacy provided herein must be filed with the

secretary of the appropriate election board no earlier than 8:00

a.m. on the first Wednesday of April of any even-numbered year and

no later than 5:00 p.m. on the next succeeding Friday. Such

Declarations of Candidacy may be transmitted by United States mail,

but in no event shall the secretary of any election board accept

such Declarations after the time prescribed by law.