My good friend Robert and I were shooting some rockets this weekend, no where NEAR Houston and we never got one much above 500-700 feet. Loads of fun, and the recovery process got us out walking on a great day, as the rockets tended to land some 1/4 to 1/2 mile down range.
The biggest challenge around here is finding an open place where you can launch one higher than 500’ and have it land without getting caught in trees or power lines.