DFW area has an active bicycling community. You can often on weekend mornings see groups of riders around the Metroplex area, and there are trails even for mountain biking. Here is some bicycling information gathered throughout the years.
Where to get your bike
Farmers Branch, Fort Worth, Plano, Southlake Protected content
Dallas, Frisco, Richardson Protected content
Plano Protected content
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Great and a little challenging mountain biking trail is on the north side of Lake Grapevine. Protected content
White Rock Lake is popular but crowded.
There are awesome country roads on the north side of the Metroplex, with only a few cars, in Highland Village, Argyle, Justin, Prosper, Celina, McKinney.
Free group rides
A couple of stores arrange free group rides. The rides typically start at 7/8 am to beat the hot summer heat. Bikemart has multiple routes around Metroplex Protected content . Around Plano / Frisco area there are rides by Trishop Protected content . Check out the speed of the group you're planning to ride with, some of the groups ride really fast!! If you're a beginner, start with 12/14 mph group, and if you're nearly a professional, try over 20 mph groups.
Local gyms like some Lifetime Fitness has weekly group rides
When biking during summertime, take plenty of water / Gatorade with you and leave early (7/8 am) if you're planning to ride for a long time. The heat will get you! Remember to wear plenty of sunscreen. Also, it is good to ride with a group if you're riding on country roads. Not because it is dangerous per se, but in case you fall down and fracture some bones (like undersigned), you won't be alone. A good idea is also to carry a spare tube and CO2 cartridge with you if you're riding a road bike. There are plenty of sharp objects on the roads. Traffic can be quite aggressive on the roads, bike trails and country roads are most relaxing to ride on. If you plan to ride during dusk/dawn/in the dark, you will need to solemnly swear to me to wear something reflecting and have your bike properly equipped with reflectors and lights!
There are plenty in Texas and neighboring states! A little google search will prove it. One of the famous ones is Hotter'N Hell 100, Protected content in Wichita Falls in August. Guaranteed HOT!
Enjoy your rides!