Short answer: Most summer internships last 10 to 12 weeks. They start between mid-May and late June and end in August. NASA's summer session is 10 weeks. SpaceX asks Summer 2027 interns for at least 12 weeks in a row, starting in May or June 2027.
Two real examples
| Employer | Summer 2027 length | Start |
|---|---|---|
| NASA OSTEM internships | 10 weeks (spring and fall sessions are 15) | Set by NASA for each session |
| SpaceX engineering internship | At least 12 consecutive weeks | May or June 2027 |
Why start dates differ
Schools on semesters usually finish in early to mid May. Schools on quarters, such as many in California, finish in mid June. Employers that hire from both often let interns choose a start date, or run two start waves a few weeks apart. If your school ends late, say so when you accept an offer. It is a normal question.
Things to check before you accept
- Minimum length. Some programs need a set number of weeks in a row, so a late finish or an early fall move-in can clash.
- Return to school. Many internships require that you are still a student after the summer. Check the graduation window on the posting.
- Full time or part time. Most summer roles are full time, about 40 hours a week.
- Location. On-site programs may expect you to move for the summer. Some help with housing; ask.
Still looking for one?
On November 9, 2026, Useno listed 6,910 Summer 2027 roles. Browse the internship board, or start with a field: 638 software engineering internships, 563 finance and banking internships, 945 engineering internships.
Sources
Employer dates come from each employer's own pages where they publish them. A date that only a third party reports is marked Third party. Useno counts are Useno's own data, read on November 9, 2026.
- OfficialNASA internship programsnasa.gov
- OfficialSpaceX careersspacex.com
- Useno dataUseno internship index, read November 9, 2026useno.app