While UC Davis doesn't publish an exact average ACT score, it's safe to say that successful applicants generally score well above the national average. To be competitive, you should aim for a composite score in the upper 20s or higher. A score in the 30s significantly improves your chances. Remember, a high ACT score is just one factor in the admissions process; GPA, coursework rigor, extracurricular activities, and essays also play a significant role.