Application deadlines vary by department (see below). Caltech conducts admissions once each year and applicants are considered for admission to the fall term only. All decisions will be posted no later than April 1.
| Department (All degree programs) | Application Deadline |
| Aeronautics | December 15 |
| Applied and Computational Mathematics | December 15 |
| Applied Mechanics | December 15 |
| Applied Physics | January 1 |
| Astrophysics | December 15 |
| Behavioral and Social Neuroscience | December 15 |
| Biochemistry and Molecular Biophysics | December 15 |
| Bioengineering | December 15 |
| Biology | December 15 |
| Chemical Engineering | December 15 |
| Chemistry | December 15 |
| Civil Engineering | December 15 |
| Computation and Neural Systems | December 15 |
| Computer Science | December 15 |
| Computing and Mathematical Sciences | December 15 |
| Control and Dynamical Systems | December 15 |
| Electrical Engineering | December 15 |
| Environmental Science and Engineering | January 1 |
| Geobiology | January 1 |
| Geochemistry | January 1 |
| Geology | January 1 |
| Geophysics | January 1 |
| Materials Science | January 1 |
| Mathematics | December 15 |
| Mechanical Engineering | December 15 |
| Medical Engineering | December 15 |
| Neurobiology | December 15 |
| Physics | December 15 |
| Planetary Science | January 1 |
| Social Science | December 15 |
| Space Engineering | December 15 |
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