| Application deadline | Unconfirmed — check official site | December 31, 2026 (2027 cycle) | Unconfirmed — check official site |
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| Cost | $5,793 (2027 cycle) | $3,650–$6,550 (2027 cycle) | Unconfirmed — check official site |
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| Financial aid | Need-based financial assistance for application and program costs: Amount: Unconfirmed — check official site. Based on family income, family size and available COSMOS resources. (2027 cycle) | Limited case-by-case need assistance (no formal aid program): Amount: Unconfirmed — check official site (2027 cycle) | Catalog terms: Summer Scholars Support (California high school students): Amount: Unconfirmed — check official site. Need- and merit-based full and partial scholarships for current 9th-11th grade California students.; 2027: Unconfirmed — check official site |
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| Expenses and aid conditions | Application fee: Amount: Unconfirmed — check official site. Non-refundable; fee waivers can be requested.; Need-based financial assistance for application and program costs: Amount: Unconfirmed — check official site. Based on family income, family size and available COSMOS resources. (2027 cycle) | Application fee (includes a one-year Concord Review eBook subscription): Amount: Unconfirmed — check official site; Limited case-by-case need assistance (no formal aid program): Amount: Unconfirmed — check official site (2027 cycle) | Catalog terms: Registration fee (non-refundable): $350; Summer Scholars Support (California high school students): Amount: Unconfirmed — check official site. Need- and merit-based full and partial scholarships for current 9th-11th grade California students.; 2027: 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) | Grades 9–12; Grade timing: Unconfirmed — check official site | Grades 9–12; Grade timing: Unconfirmed — check official site |
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| Additional eligibility | Residency: California high school students only; Requirement: Open to rising grades 9–12; Requirement: Demonstrated academic excellence (a typical COSMOS student has a GPA of 3.5 or above) | Requirement: Open to grades 9–12; Requirement: Rising 9th graders are eligible; younger students with strong academic readiness may be considered; Requirement: A chosen historical research topic and 3-5 books on it, read before the camp starts | Minimum age 15; Requirement: Open to grades 9–12; Requirement: Courses chosen from the Pre-Approved High School Course List |
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| Session dates or duration | Catalog terms: 4 weeks; 2027: Unconfirmed — check official site | Starts June 6, 2027; Ends August 13, 2027; 2–9 weeks (2027 cycle) | Last year's cycle (2026): Starts June 22, 2026; Ends September 11, 2026; 3–10 weeks; 2027: Unconfirmed — check official site |
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| Format | In person | Online / In person | In person / Online |
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| Housing and supervision | Residential. Supervision and housing details: Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Location | Davis, Irvine, Los Angeles, Merced, San Diego, Santa Cruz, CA | Boston, Hotchkiss, Stanford, Vancouver, MA, CT, CA | Los Angeles, CA |
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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: Online application with one personal statement; One teacher recommendation (two recommended) | Selection: Current FAQ reports 18 students per session, 1:6 teacher-student ratio and more qualified applicants than places in many early cycles. No overall acceptance rate is published. TCR says it publishes roughly 5% of journal submissions, which is a separate process. Application materials: Optional teacher recommendation letter | Unconfirmed — check official site |
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| Official sources | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-08-22Source 5 · checked 2026-08-22Source 6 · checked 2026-08-22Source 7 · checked 2026-08-20 | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-10-24Source 5 · checked 2026-10-24Source 6 · checked 2026-08-22Source 7 · checked 2026-08-20Source 8 · checked 2026-08-20 | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-10-24Source 5 · checked 2026-10-10 |
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