The deadline for voters to register so they can participate in the 2018 Texas Primary election is Monday, Feb. 5, 2018. Texas will host the first statewide primaries of 2018 on March 6 for both Democrat and Republican primaries. Voter registration applications can be requested online here. If you are already a registered voter, you do not have to re-apply. For more information visit www.votetexas.gov.