Texas Election Code - ELEC § 41.001. Uniform Election Dates

(1) the first Saturday in May in an odd-numbered year;

(2) the first Saturday in May in an even-numbered year, for an election held by a political subdivision other than a county, or ordered by the governor;  or

(3) the first Tuesday after the first Monday in November.

(1) a runoff election;

(2) an election to resolve a tie vote;

(3) an election held under an order of a court or other tribunal;

(4) an emergency election ordered under Section 41.0011 or any resulting runoff;

(5) an expedited election to fill a vacancy in the legislature held under Section 203.013;

(6) an election held under a statute that expressly provides that the requirement of Subsection (a) does not apply to the election;  or

(7) the initial election of the members of the governing body of a newly incorporated city.