| Application deadline | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Cost | Unconfirmed — check official site | $6,850 (2027 cycle) | $5,793 (2027 cycle) |
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| Financial aid | Unconfirmed — check official site | Deer Hill Foundation need-based scholarship: Amount: Unconfirmed — check official site. Awards are based on financial need and a completed application; award size varies with available funds. (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) |
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| Expenses and aid conditions | Unconfirmed — check official site | Tuition deposit with application: $750. Includes a non-refundable $150 administrative processing fee; $600 is refunded if the participant is not accepted.; Non-refundable application processing fee (part of the deposit): $150. Included in the $750 tuition deposit.; Refundable Outfitting Store deposit: $300. Due with the final payment; covers gear rental or purchases, and any unused portion is refunded after the program.; Credit card convenience fee for final payment: $100. Only when the final payment is made by credit card instead of check.; Deer Hill Foundation need-based scholarship: Amount: Unconfirmed — check official site. Awards are based on financial need and a completed application; award size varies with available funds. (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) |
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| Stipend or pay | Catalog terms: Completion stipend (up to $2,000): $2,000; 2027: Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Eligibility | Grade 11 when applying; summer rising grade is one higher | Unconfirmed — check official site | Grades 9–12 (provider uses rising grades) |
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| Additional eligibility | Residency: Enrolled in a Massachusetts high school and living within 30 miles of Boston; Requirement: Open to students currently in grade 11 when applying; Requirement: In 2026, applicants had to be at least 16 years old by July 1, 2026; Requirement: Priority goes to students in the immediate Boston metropolitan area; Requirement: Demonstrated record of achievement in science; Requirement: Able to attend the orientation and all six weeks, Monday to Friday, 9:30 AM to 4:30 PM | Ages 16–18 | 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) |
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| Session dates or duration | Last year's cycle (2026): Starts July 6, 2026; Ends August 14, 2026; 6 weeks; 2027: Unconfirmed — check official site | Starts July 1, 2027; Ends July 25, 2027 (2027 cycle) | Catalog terms: 4 weeks; 2027: Unconfirmed — check official site |
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| Format | In person | In person | In person |
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| Housing and supervision | 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 | Boston, MA | Mancos, CO | Davis, Irvine, Los Angeles, Merced, San Diego, Santa Cruz, CA |
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| Selection and application | Application materials: Two teacher recommendations (at least one from a science or math teacher; none from family or friends) | Selection: Deer Hill reviews the application, references, health/readiness information, and available space; current capacity, applicant volume, and admit rate are not published. | 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) |
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| Official sources | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-10-24 | Source 1 · checked 2026-10-24Source 2 · checked 2026-10-24Source 3 · checked 2026-10-24Source 4 · checked 2026-10-10Source 5 · checked 2026-10-10 | 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 |
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