The first thing elections officials want you to know is that if you didn't vote in May 29th primary, you can still vote in the run-off. The only caveat; you can't switch parties in the run-off. If you voted in the Democratic primary, you can't vote in the Republican run-off.
Harris County Clerk Stan Stanart says the guidelines are simple.
"All they need to have is their voter registration card. Photo ID has not been implemented yet, but of course you can use your driver’s license to vote with as well. The whole list is on HarrisVotes.com. You are open 7-7 early voting, Monday through Friday, just one week of early voting, so come out and vote."
The early vote in the primary in May made up about 45-percent of the total vote. Stanart says he expects another strong early vote turnout.
"I still think election day, we'll still have more people voting election day than early, but also we've sent out a lot of ballot by mails. A lot of people are going to be out of town, out of state and they'll actually be voting by mail."
There are six run-off races to be decided in the Democratic primary, including a tight contest in the District 137 State Representative fight between Gene Woo and Jaamal Smith. Jenard Jenkins is with the Harris County Democratic
"This is going to be the measure for November. When you cast a vote, early voting or when you cast a vote for the run-off on the 31st of this month, you are essentially casting a vote for the ballot in November. This vote that is coming up on the
31st is just as important as the one that's coming up in November."
GOP voters will decide on what has been a tough run-off campaign between Senate hopefuls David Dewhurst and Ted Cruz. Harris County Republican Party Chairman Jared Woodfill says he's confident voters will be choosing the next US Senator.
"Whomever wins this Senate race will be the next senator from the state of Texas. The polling information shows you that the
Republican nominee, whomever that may be, will be successful in November. So as far as I'm concerned, this will determine who the next United States Senator is from Texas for some number of years."
Democrats Paul Sadler and Grady Yarbrough are also vying for their party's Senate nomination in the run-off.
You can find information about early voting, including precinct locations, sample ballots, and candidate information on the KUHF election page.