A surefire way to know that summer in Texas is winding down? The 5Ks return. Now that it's not nearly as scorching as, say, July, you can take your workout outdoors — at least some of the time.

Here are but a few of the big races set for September:

Katy 5K, September 7
Run and have fun on a unique course that takes you through some of the most beautiful parts of Dallas, including Turtle Creek, Uptown, and Katy Trail. Post-race, celebrate at the Picnic Party with DJ Poizon Ivy, free Michelob Ultra (for those 21 and over), free food from more than 30 local eateries, sponsor swag, and selfie stations.

9/11 Heroes Run, September 16
Be a part of this race, which happens all over the country and is organized by the Travis Manion Foundation, to honor veterans, first responders, civilians, and military who jumped into action on 9/11. The Dallas race takes place in Arlington

Guts & Glory Zombie Experience, September 16
Zombies are taking over Rorie-Galloway Day Camp in Mesquite — do you have what it takes to escape and survive? Humans (runners) will run through the woods and compete in team-building challenges to test strength, speed, problem-solving, and teamwork. Collect survival essentials along the way to ensure your team's safe passage to the finish. If you choose to be a Zombie, come dressed in your appropriately gory best and try to grab the runner's flags as they zoom by.

Fort Worth Oktoberfest Run und Ride, September 21-23
Within this three-day celebration of German culture, you'll not only find competitions like stein-hoisting and bier barrel-rolling but also 5K and 10K runs along the Trinity Trail and 20-mile urban bike ride. All race and run participants receive a free three-day pass to the fest, and dressing in lederhosen is recommended!

The Garland Guzzler, September 23
The "physically demanding" and "mentally strenuous" race known as the Garland Guzzler 0.5K is coming back for its sixth year. Race to the Granville Arts Center parking lot from 6-10 pm and cheer on the “athletes” as they run the 0.5K route (546 yards or 1,638 feet, to be exact), enjoy the after-race Oktoberfest festivities, food, beverages from Intrinsic Smokehouse & Brewery, live music from The Dogensteins, and much more.

Oaktoberfest, September 24
Oak Cliff's take on the traditional German celebration includes a 1.128-mile fun run around Tyler Station, with beer samples for each lap completed. Stay for more beer, brats, and live polka music.

Rock of Ages Run, September 30
Get ready to rock your way through a 5K, 10K, or half marathon in Forth Worth, where rock music will be blaring throughout the course and everyone can enjoy the race's famous pancakes at the post party.