| Application deadline | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Cost | $2,500–$5,800 (2027 cycle) | $5,793 (2027 cycle) | $699–$2,500 (2027 cycle) |
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| Financial aid | Limited financial aid: Amount: Unconfirmed — check official site. Apply with the Financial Aid Application. (2027 cycle) | 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 need-based scholarships: Amount: Unconfirmed — check official site. Not for the residential portion and not for international students; separate GI Partners need-based scholarships for Boston-area rising seniors. (2027 cycle) |
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| Expenses and aid conditions | Application fee: $70. Non-refundable.; Limited financial aid: Amount: Unconfirmed — check official site. Apply with the Financial Aid Application. (2027 cycle) | 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) | Residential fee ($699 per week; housing, three meals a day, supervision): $699–$2,097. On top of tuition; $2,097 for a three-week program.; Seat deposit ($200 one-week; $500 three-week or remote): $200–$500; Optional airport transportation (one way $50-$75, round trip $99): $50–$99; Optional linen rental for residential students: $50; Limited need-based scholarships: Amount: Unconfirmed — check official site. Not for the residential portion and not for international students; separate GI Partners need-based scholarships for Boston-area rising seniors. (2027 cycle) |
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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 7–12 (provider uses rising grades) | Grades 9–12 (provider uses rising grades) | Grades 6–12 and first-year college (provider uses rising grades) |
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| Additional eligibility | Requirement: Open to rising grades 7–12; Requirement: Course minimums vary: Physics of the Electric Guitar is for rising 8th graders and older, Fun with DNA is for rising 7th and 8th graders, and the Piano Program is for intermediate and advanced pianists ages 11-18 | 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 rising grades 6–13; Requirement: One-week and pre-high-school programs: perform at grade level or above |
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| Session dates or duration | Starts June 27, 2027; Ends July 24, 2027; 1–4 weeks (2027 cycle) | Catalog terms: 4 weeks; 2027: Unconfirmed — check official site | Catalog terms: 1–3 weeks; 2027: Unconfirmed — check official site |
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| Format | In person | In person | In person / Online |
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| Housing and supervision | Residential. Supervision and housing details: Unconfirmed — check official site | Residential. Supervision and housing details: Unconfirmed — check official site | Residential. Supervision and housing details: Unconfirmed — check official site |
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| Location | Lakeville, CT | Davis, Irvine, Los Angeles, Merced, San Diego, Santa Cruz, CA | Boston, Waltham, Wellesley, Weston, MA |
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| Selection and application | Selection: Rolling, course-specific admission; Hotchkiss does not publish a program-wide acceptance rate. Application materials: Two teacher recommendations | 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: Three-week and remote programs used competitive rolling review based on academic record, curiosity, subject commitment, perspective, and experience. One-week and pre-high-school programs were capacity-based registration. Application materials: Three-week programs: online application with an essay |
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| Official sources | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-10-24Source 5 · checked 2026-10-24Source 6 · checked 2026-10-24Source 7 · checked 2026-10-24Source 8 · checked 2026-10-24Source 9 · checked 2026-10-24Source 10 · checked 2026-10-24Source 11 · checked 2026-10-24Source 12 · checked 2026-08-21Source 13 · checked 2026-08-21 | 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 2026-08-21Source 5 · checked 2026-08-20 |
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