The purpose of this study was to examine the warm-ups chosen by concert band directors participating in state-level performance assessments. We observed 29 middle and high school bands and coded the frequency and duration of warm-up activities and behaviors. Results indicated that most bands rehearsed music and played scales, long tones, and interval exercises; approximately one third concentrated on breathing, articulation, and chorales. More high school directors used singing exercises than middle school directors, and more middle school directors tuned their ensembles than high school directors. Middle school directors spent 23% of the warm-up time tuning with an electronic tuning device. Directors mostly spent time teaching, tuning, and playing through pieces, and mental warm-up exercises and imagery constituted less than 1% of all activities. Considering the abundance of recommended practices and limited time available for warm-up at a festival; this study may provide evidence for the profession to differentiate between warm-up practices for rehearsal and assessment.