| Application deadline | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Cost | Last year's cycle (2026): $5,518; 2027: Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Financial aid | Last year's cycle (2026): 2026 need-based application and program assistance: Up to $5,564. Could assist with the $46 application fee and $5,518 program cost based on family income, family size and available funds; actual award not guaranteed.; 2027: Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Expenses and aid conditions | Last year's cycle (2026): 2026 COSMOS application fee: $46. Nonrefundable; pending fee-waiver review could change when or whether payment was required.; Credit-card transaction fee on program payments: Amount: Unconfirmed — check official site. Approximately 2.5% when paying program costs by credit card; application fee exempt.; 2026 need-based application and program assistance: Up to $5,564. Could assist with the $46 application fee and $5,518 program cost based on family income, family size and available funds; actual award not guaranteed.; Full-financial-aid attendance deposit: $200. Required only for admitted students offered full aid and refunded to the legal guardian after successful completion.; 2027: Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Stipend or pay | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Eligibility | Grades 9–12 (provider uses rising grades) | Grade 11 when applying; summer rising grade is one higher | Grades 9–12 when applying; check the provider's rules for graduating seniors |
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| Additional eligibility | Residency: Attend high school in person in California; Requirement: Be rising into grade 9, 10, 11 or 12 for the program fall year; Requirement: Attend high school in person in California; Requirement: Demonstrate academic excellence and preparation for the selected STEM cluster; Requirement: Complete cluster-specific course prerequisites; Requirement: Live on the host UC campus for the full program; Requirement: Be a first-time COSMOS participant; Exclusion: Students not attending a California high school in person; Exclusion: Students who previously attended any COSMOS program; Exclusion: Applicants outside the rising-grade 9-12 range; Exclusion: Applicants unable to live on campus for the full program; Exclusion: Late application, supporting, payment or admission materials; Exclusion: Assuming a 3.5 GPA is an absolute statewide minimum rather than the published typical profile | Residency: U.S. citizens may reside anywhere; Residency: Non-U.S. citizens must already live in the United States; F-1 students are explicitly eligible and other visa holders must confirm with GSTEM; Requirement: Be a current high-school junior at application time; Requirement: Demonstrate high aptitude in STEM; Requirement: Attend every day of the six-week program; Requirement: Not participate in another program simultaneously; Requirement: Be open to a mentor and research placement selected by GSTEM; Exclusion: Current sophomores and seniors are not eligible for the summer research program; Exclusion: Non-U.S. citizens living outside the United States are ineligible; Exclusion: The program is open to all genders; being a girl is not an eligibility requirement; Exclusion: Students may not miss part of the program or choose a specific mentor or research topic | Citizenship: Historical 2026 rule: International students may attend subject to U.S. entry requirements; Requirement: Historical 2026 rule: Be currently enrolled in grade 9, 10, 11 or 12 when registering; Requirement: Historical 2026 rule: Submit a motivation essay or approved alternative-media statement if new; Requirement: Historical 2026 rule: Submit exactly two accepted forms of academic or talent-area evidence if new; Requirement: Historical 2026 rule: Meet at least two documented gifted/talent indicators; Requirement: Historical 2026 rule: Live under Purdue's supervised residential-camp rules; Exclusion: Historical 2026 rule: The $1,495 rate applies to a different residential/commuter track, not PULSAR; Exclusion: Historical 2026 rule: Returning students are exempt from the essay and qualifying documentation; Exclusion: Historical 2026 rule: Admission and first-choice course placement are not guaranteed; Exclusion: Historical 2026 rule: International participants arrange and pay for their own transportation and immigration compliance |
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| Session dates or duration | Catalog terms: 4 weeks; 2027: Unconfirmed — check official site | Catalog terms: 6 weeks; 2027: Unconfirmed — check official site | Unconfirmed — check official site |
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| Format | In person | In person | Unconfirmed — check official site |
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| Housing and supervision | Residential. Supervision and housing details: Unconfirmed — check official site | Non-residential. Supervision and housing details: Unconfirmed — check official site | Unconfirmed — check official site |
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| Location | Davis, California, Irvine, California, Los Angeles, California, Merced, California, San Diego, California, Santa Cruz, California, UC Davis, UC Irvine, UCLA, UC Merced, UC San Diego, UC Santa Cruz | New York City, New York | Unconfirmed — check official site |
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| Selection and application | Selection: Each of six campuses accommodates roughly 160-200 students, and clusters typically enroll 20-25 with a commonly reported 5:1 student-to-faculty ratio. Admissions are competitive and based on academic merit relative to the selected topic, but applicant count and statewide acceptance rate were not published. Application materials: One personal statement; One required teacher recommendation, with two recommended | Selection: GSTEM describes admission as competitive and admits 40 students each summer. Decisions consider high-school academics, essays, STEM activities, and one recommendation; applicant count and acceptance rate are not published. Application materials: Four essays; One recommendation from a teacher, advisor, or counselor; Optional Winston Data Scholarship essay | Selection: The 2026 application documented gifted/talent indicators and course placement depended on eligibility and availability. Confirm the next-cycle process; no acceptance rate is published. Application materials: Historical 2026 instructions: One-to-two-page motivation essay or alternative media statement for new students; Historical 2026 instructions: Exactly two qualifying documents from transcript, IQ testing, achievement testing, teacher/mentor recommendation or talent-involvement documentation |
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| Official sources | Source 1 · checked 2026-08-22Source 2 · checked 2026-08-22Source 3 · checked 2026-08-22Source 4 · checked 2026-08-22Source 5 · checked 2026-08-22Source 6 · checked 2026-08-22Source 7 · checked 2026-08-20 | Source 1 · checked 2026-10-09Source 2 · checked 2026-10-09Source 3 · checked 2026-08-21Source 4 · checked 2026-08-21Source 5 · checked 2026-08-21 | Source 1 · checked 2026-10-12 |
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