Police said the men were wearing hooded sweatshirts and masks over their faces. They were armed and demanded cash from the registers.
The suspects threatened to shoot two employees during the robbery, and then they fled the scene in a dark-colored SUV.
The suspects are described as men between the ages of 18-25. Two were about 5 feet 5 inches to 5 feet 8inches tall, and weighed about 150 to 160 pounds. The third was about 5 feet 9inches to 6 feet tall, weighing about 185 to 190 pounds.
Anyone with information is asked to call Crime Stoppers at (713) 222-TIPS.