| Application deadline | Unconfirmed — check official site | Unconfirmed — check official site | Unconfirmed — check official site |
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| Cost | Unconfirmed — check official site | Last year's cycle (2026): $5,518; 2027: Unconfirmed — check official site | Last year's cycle (2026): $1,500; 2027: Unconfirmed — check official site |
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| Financial aid | Unconfirmed — check official site | 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 | Last year's cycle (2026): Need-based financial aid: Amount: Unconfirmed — check official site. Requested in the application with the first page of the family's most recent Form 1040; the request does not affect admission.; 2027: Unconfirmed — check official site |
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| Expenses and aid conditions | Unconfirmed — check official site | 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 | Last year's cycle (2026): Nonrefundable enrollment deposit: $200. Due within 14 days after acceptance. Confirm whether this deposit is credited toward the published $1,500 total before paying; the captured wording does not settle that relationship.; Required on-campus housing included in total fees: $0. Included in the $1,500 total, not an additional charge.; Meals included in total fees: $0. Included in the $1,500 total, not an additional charge.; Need-based financial aid: Amount: Unconfirmed — check official site. Requested in the application with the first page of the family's most recent Form 1040; the request does not affect admission.; 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 | Unconfirmed — check official site | Grades 9–12 (provider uses rising grades) | Grades 9–11 (provider uses rising grades) |
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| Additional eligibility | Requirement: American Legion Boys State gives selected high-school students hands-on experience creating and running a mock state government. Schools and local Legion posts usually recommend, interview and select delegates. Requirements, dates and costs are set by the state programme.
Two delegates from each Boys State programme may advance to Boys Nation in Washington, D.C. The national 2027 session is announced for summer, but that is not a shared Boys State application deadline or venue. Sponsorship and family-paid costs must be checked locally. | 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 | Ages 15–18; Requirement: Be a rising high-school sophomore, junior, or senior for the 2027 program; Requirement: Be age 15-18 when the camp begins; Requirement: Apply to music, dance, theatre, or musical theatre with the required discipline-specific material; Requirement: Be able to participate in the required residential program for the full session; Exclusion: Students who do not meet both the published rising-grade and age rules; Exclusion: Admission to more than one discipline in the same session; Exclusion: Assuming Summer TUTTI offers broad liberal-arts sampler courses or Denison college credit |
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| Session dates or duration | Unconfirmed — check official site | Catalog terms: 4 weeks; 2027: Unconfirmed — check official site | Starts June 19, 2027; Ends June 27, 2027; 1–2 weeks (2027 cycle) |
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| Format | Unconfirmed — check official site | 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 | Unconfirmed — check official site | 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 | Granville, Ohio, Denison University residential campus |
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| Selection and application | Unconfirmed — check official site | 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: Track-specific audition or supplemental review on a rolling basis until capacity is reached; no current acceptance rate or track capacity is published. Application materials: One online recommendation from a teacher or school counselor; Track-specific audition videos, performance materials, portfolio, or responses |
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| Official sources | Source 1 · checked 2026-10-09Source 2 · checked 2026-10-09Source 3 · checked 2026-08-21 | 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 2026-10-09Source 4 · checked 2026-08-20 |
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