Be careful, though. At some schools, the frosh engineering students need to maintain a high enough college GPA in order to get into the major of their choice (e.g. 3.2 GPA needed at Purdue and Minnesota; those with lower GPAs may be admitted to majors with space available). Check how freely (in terms of GPA requirements and such) you can choose your major. At schools where you enter pre-declared in a specific engineering major, check how freely you can change your major.
At some schools, there may be an option for frosh to enter pre-declared or as undeclared in engineering. Again, check on the details of how freely the student can change or declare an engineering major.