The Lopez Marching Band begins their season at the end of July, when students report for fundamentals to strengthen all required aspects. Students participate in conditioning exercises as part of their marching fundamentals block to develop stamina required for a competitive production. In addition to developing marching fundamentals, students participate in sectionals and full band rehearsals indoors to refine skills necessary to output the product for which Lopez High School have become known. After August 1st, the band begins learning the drill and associated choreography to accompany the music that the students have been diligently learning.
     The competitive season usually begins the second week of October, but the band begins performing the show for public audiences with the first football game. Each week, the rehearsal schedule is based on specific needs, whether it be that more time be spent on music, drill, or any combination of both with added choreography. Rehearsals typically begin at 5:30 to allow students to attend tutorial, club meetings, do homework, retest, or just practice.
     On even numbered years, the band competes for a position at the UIL State Marching Band Contest. This process involves earning a superior rating at the Region UIL contest and placing highly at the UIL Area G Marching Contest. Only the top placing bands earn positions at the State Contest. Along with these contests, the band will usually compete in one Pre-UIL contest and will also travel annually to San Antonio to compete in the Bands of America Super Regional Competition to compete against some of the best bands in Texas and surrounding states.
     The Marching Band also participates in several parades throughout the year, including the Brownsville Christmas Parade, a Veterans Day Parade, and the annual Charro Days Parade. These parades allow the band to entertain audiences in a different setting than the football games and contests.