  Yesterday I went to urlLink Texas Rock Gym for the first time in a long, long while urlLink (took the boy, had blast) . But they're a little pricey so I decided to look online to see if anyone else has opened a gym in Houston. They haven't. urlLink This site lists some interesting urban climbs for us mountain-starved poor souls living in Houston. They include: Montrose area has a 25' tall crack where it passes under US-59. It was about 1 block West of Montrose Blvd. Bldg on San Felipe just West of Voss Rd. Drive down the ramp to the parking area. Backside of building (facing the bayou) has/had a bunch of glued on holds on it. (About 35' traverse route. ) Motel/Hotel on US-59 at Westleyan on N.W. corner of intersection. West facing wall of Randalls at Memorial and Dairy-Ashford. 
