Storms sent players off the course, but the skies cleared by noon and players resumed their rounds at 12:30 p.m.
The Dallas Cowboys quarterback is one of 36 players vying for two spots in a 36-hole sectional qualifier at The Club at Carlton Woods, just north of Houston. Romo was 2-over par after five holes when rain halted play about 10:30 a.m.
Romo is playing with Thomas Hagler and Dustin Wiginton.
The field also includes former PGA champion Steve Elkington and PGA Tour pro Bob Estes.
Romo survived a four-man playoff May 20 to advance to the sectional qualifier. Romo passed up a qualifier for the Byron Nelson Championship that week because it conflicted with a Cowboys practice. The NFL team resumes offseason training activities Tuesday.
Romo drew a crowd of about 20 fans as he hit balls on the practice range a half-hour before his tee time. A few of them wore Cowboys hats and shirts and one 11-year-old boy wore a blue Romo jersey.
He got polite applause when he was introduced by the starter on the first tee, waved to the fans and said, "Thanks, I appreciate it." He hooked his first drive toward a cluster of trees lining the No. 1 fairway.