Below is the early voting info I got from the city.
When do I vote?
Dates and times of early voting shall be:
April 29 - May 3 (Monday through Friday) Dallas and Tarrant County 8 a.m. - 5 p.m.
May 4 (Saturday) Dallas County 8 a.m. - 5 p.m.
Tarrant County 7 a.m. - 7 p.m.
May 5 (Sunday) Dallas County 1 p.m. - 6 p.m.
Tarrant County 11 a.m. - 4 p.m.
May 6 - May 7 (Monday and Tuesday) Dallas and Tarrant County 7 a.m. - 7 p.m.
Early voting by personal appearance will be conducted at the following locations:
Crosswinds High School (Dallas County voters only)
1100 N. Carrier Parkway
Garner Elementary School (Dallas County voters only)
145 Polo Road
Asia Times Square (Tarrant County voters only)
2615 W. Pioneer Parkway
Dallas County voters may make application for mail ballots directly to the Dallas County Elections Administrator, 2377 N. Stemmons Freeway, Suite 820, Dallas, Texas 75207; Tarrant County voters may make application for mail ballots directly to the Tarrant County Elections Administrator, 2700 Premier Street, Fort Worth, Texas 76111. Applications for ballots by mail must be received no later than May 3, 2013.
The last day to register to vote in the May 11, 2013 election is April 11, 2013.