Regeneron ISEF vs Regeneron STS: Which Program Is Right for You?
Same sponsor, different games: ISEF is the world-championship science fair you qualify for through affiliated regional fairs (any grade); STS is a seniors-only national talent search judged on a written research paper and its author. Juniors aim at ISEF; seniors with finished research enter STS.
Below is a side-by-side comparison of Regeneron International Science and Engineering Fair (ISEF) and Regeneron Science Talent Search (STS). A blank row is a fact we do not hold — not a zero, and not a no.
| Regeneron ISEF | Regeneron STS | |
|---|---|---|
| Cost | ||
| Application deadline | November 5, 2026 | |
| Grade eligibility | Grades 9–12 | Grade 12 |
| Format | Hybrid | In person |
| Location | Washington, DC, USA | Washington, DC, D.C. |
| Program dates | ||
| Application destination | findafair.societyforscience.org | societyforscience.org |
| Organizer | Society for Science | Society for Science |
Regeneron International Science and Engineering Fair (ISEF)
Regeneron Science Talent Search (STS)
Frequently asked questions
Can I apply to both Regeneron ISEF and Regeneron STS?
The application destinations are evaluated independently. Regeneron ISEF: findafair.societyforscience.org. Regeneron STS: societyforscience.org. Review each provider's current instructions before assuming either application is open or compatible with the other.
Which is better for college applications, Regeneron ISEF or Regeneron STS?
We do not rank enrichment programs by admissions value. Use the comparison to assess whether each program's documented constraints fit your situation, and check the details that decide it for you on each program's official page.
What grades can apply to Regeneron ISEF and Regeneron STS?
Regeneron ISEF: Grades 9–12. Regeneron STS: Grade 12. Eligibility can change between cycles, so confirm it on each program's official page before applying.
