The Passing Tree is a numbered system used for the passing routes. The passing tree system is designed so that all even- numbered routes (2,4,6,8) are run towards the middle of the field and all odd-numbered routes (1,3,5,7,9) are be run towards the sideline. These routes are used for all positions on the field.

The route tree is a fundamental concept in football that categorizes various pass patterns or routes run by wide receivers. A standard route tree contains nine primary routes, each assigned a number from 1 to 9. The route tree helps both the quarterback and the team’s wide receivers understand and properly execute pass plays on the field.