Funding search · EIN 996005445 · Kailua, HI

Harold Kl Castle Foundation

A private foundation (files IRS Form 990-PF). Most private foundations do not take unsolicited applications; the route in is usually a program officer.

302
grants reported
$22.0M
total given
2022–2024
filing years
$40,000
median grant

Based on grants this organization reported to the IRS for tax years 20222024. This is what they filed, not a complete record of their giving, and recent years may be incomplete because filings lag.

What they fund

communityhawaiischoolhawaibasedwindwardeducationhigh

Funder website ↗Full IRS filings ↗How this is builtReport an error

Funding pattern

What this funder pays for, at what size, and how to position adjacent work. Read from their filings, with every number checked against the record.

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16 grants matching “unsolicited · $492,500

  • $50,000

    Hawaii Chamber of Commerce Foundation · Honolulu, HI · 2024

    Unsolicited challenge grant to hawaii chamber of commerce foundation to support business relief fund to help businesses affected by the maui wildfires [5953; pc]

  • $5,000

    Boys & Girls Club of Hawaii · Honolulu, HI · 2024

    For an unsolicited grant award to windward boys and girls clubhouse [6130; pc]

  • $5,000

    Kailua Historical Society · Kailua, HI · 2024

    Unsolicited grant to kailua historical society in recognition of our longstanding commitment to kailua and to honor the memory of dr. Paul brennan [6121; nc]

  • $100,000

    Maui United Way · Wailuku, HI · 2023

    Unsolicited flexible grant to maui united way to build their capacity to help provide relief to those directly impacted by the wildfires on maui, to support community organizations providing that relief, and to help in read all
  • $50,000

    Center for Disaster Philanthropy · Washington, DC · 2023

    Unsolicited grant to center for disaster philanthropy to support the hawaii wildfires recovery fund [5946; pc]

  • $50,000

    University of Hawaii Foundation · Honolulu, HI · 2023

    Unsolicited grant to university of hawaii foundation to support the stupski maui relief fund that will help uh students affected by the maui wildfires to remain enrolled in college [5945; pc]

  • $50,000

    Hawaii People'S Fund · Honolulu, HI · 2023

    Unsolicited flexible grant to hawaii people's fund to build their capacity to help provide relief to those directly impacted by the wildfires on maui and to amplify their voice in decision making through the "maui aloha read all
  • $50,000

    Hui O Waa Kaulua · Kahului, HI · 2023

    Unsolicited flexible grant to hui o wa'a kaulua to build capacity to help provide relief to those directly impacted by the wildfires on maui and also to help replace hui o wa'a kaulua's canoes lost in the wildfires [595 read all
  • $50,000

    California Fire Foundation · Sacramento, CA · 2023

    Unsolicited grant to the california fire foundation to support the maui wildfire relief fund [5938; pc]

  • $25,000

    Council for Native Hawaiian Advancement · Honolulu, HI · 2023

    Unsolicited grant to council for native hawaiian advancement to support outreach in the ko'olau region to help households at risk of eviction to secure rent, utility, and other support to remain housed [5897; pc]

  • $10,000

    Teach for America (Tfa) · Honolulu, HI · 2023

    Unsolicited grant to teach for america - hawaii to honor the life and memory of hawaii island complex area superintendent art souza [5834; pc]

  • $5,000

    Kahaluu Elementary School · Kaneohe, HI · 2023

    Unsolicited grant to kahaluu elementary school ukulele ensemble for funds to perform in anaheim california in february 2023 [5679; gov]

  • $20,000

    Kai Loa · Kaneohe, HI · 2022

    Unsolicited supplemental grant to complete the hale 'aina build and portables retrofit [5578; pc]

  • $10,000

    Inside the Middle East · Baltimore, MD · 2022

    Unsolicited grant to inside the middle east to support the february 2022 educational speaking series in honolulu on middle east trends and issues and their relevance for hawai'i, co-sponsored by aio foundation and the h read all
  • $7,500

    Windward School District · Honolulu, HI · 2022

    An unsolicited grant to the hawai'i department of education/windward district to increase federal financial aid fafsa filing by seniors in five public doe high schools in windward o'ahu [5672; gov]

  • $5,000

    The Shelter · Kaneohe, HI · 2022

    Unsolicited grant to the shelter to provide families the opportunity to transition into permanent housing [5478; pc]

Top recipients

Repeat recipients are the strongest signal of whether a funder has an open door or quietly re-funds the same organizations.

  • University of Hawaii Foundation41 grants · $4.6M
  • Hawaii Community Foundation (Hcf)13 grants · $3.4M
  • The Nature Conservancy of Hawaii4 grants · $1.0M
  • Kuaaina Ulu Auamo (Kua)3 grants · $1.0M
  • Social Finance2 grants · $700,000
  • Resources Legacy Fund7 grants · $454,000
  • 50can5 grants · $442,500
  • Pilina Education Alliance3 grants · $350,000
  • College Summit Inc Dba Peerforward4 grants · $326,663
  • Kualoa-Heeia Ecumenical Youth Project (Key)3 grants · $315,000

Giving over time

$8.0M
2022
$7.3M
2023
$6.7M
2024

Grant history

The 100 largest of 302 grants.

  • $700,000

    Hawaii Community Foundation (Hcf) · Honolulu, HI · 2022

    Partnering to advance hawai'i's marine 30x30 initiative phase i: building a pooled field of interest fund [5046; pc]

  • $550,000

    Social Finance · Boston, CA · 2024

    Proposal to serve as hawaii renewable learning fund manager [6086; pc]

  • $529,240

    University of Hawaii Foundation · Honolulu, HI · 2024

    Soar higher - support for windward oahu schools to participate as a gear up 6-16 model [5173; pc]

  • $529,240

    University of Hawaii Foundation · Honolulu, HI · 2023

    Soar higher - support for windward oahu schools to participate as a gear up 6-16 model [5173; pc]

  • $529,240

    University of Hawaii Foundation · Honolulu, HI · 2022

    Soar higher - support for windward o'ahu schools to participate as a gear up 6-16 model [5173; pc]

  • $500,000

    Hawaii Community Foundation (Hcf) · Honolulu, HI · 2024

    Support for a second round of contributions to the holomua pooled fund whose goal is to improve marine resources management in hawaii through a suite of efforts built on four pillars: place-based planning, pono practice read all
  • $500,000

    Kuaaina Ulu Auamo (Kua) · Kaneohe, HI · 2024

    To support and strengthen this critically important backbone organization and its three community-driven networks for ocean management in hawaii. [5598; pc]

  • $500,000

    Hawaii Community Foundation (Hcf) · Honolulu, HI · 2023

    Support for a second round of contributions to the holomua pooled fund whose goal is to improve marine resources management in hawai'i through a suite of efforts built on four pillars: place-based planning, pono practic read all
  • $498,950

    University of Hawaii Foundation · Honolulu, HI · 2023

    To ensure each doe district has a strong regional intermediary partner for work-based learning and to build a new data and accountability system around the new statewide education attainment goal adopted by the hawaii p read all
  • $403,000

    Kuaaina Ulu Auamo (Kua) · Kaneohe, HI · 2022

    To support and strengthen this critically important backbone organization and its three community-driven networks for ocean management in hawai'i [5598; pc]

  • $400,000

    Hawaii Community Foundation (Hcf) · Honolulu, HI · 2024

    Pilina fund 2.0 [5618; pc]

  • $400,000

    Hawaii Community Foundation (Hcf) · Honolulu, HI · 2022

    Pilina fund 2.0 [5618; pc]

  • $400,000

    The Nature Conservancy of Hawaii · Honolulu, HI · 2022

    E ola ke kai, e ola kakou (as the ocean thrives, so do we): 3-year core support to tnc-hawai'i marine program (2020-2022) focusing on community, strategy and technical expertise [4861; pc]

  • $300,000

    Hawaii Community Foundation (Hcf) · Honolulu, HI · 2023

    Pilina fund 2.0 [5618; pc]

  • $280,000

    The Nature Conservancy of Hawaii · Honolulu, HI · 2024

    Advancing community-based marine management to reach 30x30 goals [5660; pc]

  • $280,000

    The Nature Conservancy of Hawaii · Honolulu, HI · 2023

    Advancing community-based marine management to reach 30x30 goals [5660; pc]

  • $273,579

    University of Hawaii Foundation · Honolulu, HI · 2023

    Support for an expanded and enhanced paipai ko'olau 13th year program at windward community college [4695; pc]

  • $269,861

    University of Hawaii Foundation · Honolulu, HI · 2022

    Support for an expanded and enhanced paipai ko'olau 13th year program at windward community college [4695; pc]

  • $250,000

    Hawaii Community Foundation (Hcf) · Honolulu, HI · 2022

    Hawai'i workforce funders collaborative field workforce fund [5625; pc]

  • $214,286

    University of Hawaii Foundation · Honolulu, HI · 2024

    To extend windward community college's groundbreaking hoolei scholarship that ensures all public school graduates in the koolau region can afford to attend community college [6140; pc]

  • $202,333

    University of Hawaii Foundation · Honolulu, HI · 2022

    Hawai'i p-20 - helping young people build & strengthen their social networks [5461; pc]

  • $200,000

    Hookuaaina · Kailua, HI · 2023

    To proceed with a fifth ahupua'a systems apprenticeship cohort in partnership with windward community college, which will also include expansion to three other windward o'ahu 'aina-based education sites [5912; pc]

  • $200,000

    Hawaii Community Foundation (Hcf) · Honolulu, HI · 2022

    Pilina fund [5268; pc]

  • $200,000

    Kai Loa · Kaneohe, HI · 2022

    Hale 'aina build and portables retrofit [4413; pc]

  • $200,000

    The Trust for Public Land · Honolulu, HI · 2022

    To cover a portion of the purchase costs for the 45-acre "kane'ohe lo'i" lands in luluku valley, ko'olaupoko to protect this parcel for traditional farming, 'aina-based educational programs, cultural restoration, and co read all
  • $175,000

    Historic Hawaii Foundation · Honolulu, HI · 2023

    Support to stabilize walls of historic buildings that burned in lahaina, in partnership with the lahaina restoration foundation, and support for planning, architectural, engineering, and permitting for rehabilitation an read all
  • $160,000

    Polynesian Voyaging Society · Honolulu, HI · 2023

    Challenge grant to strengthen the polynesian voyaging society's capacity to lead a movement of sustainability based on revived indigenous wisdom and to support the moananuiakea voyage throughout the pacific [5535; pc]

  • $160,000

    Center for Tomorrow'S Leaders · Honolulu, HI · 2022

    Resilient hawai'i powered by resilient young leaders. Support to expand ctl's high school and post-high programming [5197; pc]

  • $155,000

    The Chamber of Commerce of Hawaii · Honolulu, HI · 2022

    Phase 2.0 work-based learning system-building and regional intermediary project [5184; pc]

  • $154,667

    University of Hawaii Foundation · Honolulu, HI · 2023

    Hawaii p-20 - helping young people build & strengthen their social networks [5461; pc]

  • $150,000

    Hawaii Hospital Education and Research Foundation (Hherf) · Honolulu, HI · 2024

    To retrofit doe classrooms for healthcare pathways in partnership with hawaii 3r's, g70 and hawaii pacific health [6363; pc]

  • $150,000

    University of Hawaii Foundation · Honolulu, HI · 2024

    Hawaii p-20 core support 2022-2025 [5465; pc]

  • $150,000

    Windward School District · Kaneohe, HI · 2024

    To internally drive windward doe schools towards aina aloha mindset achievement through teacher professional development (pd) days and closer engagement between schools and aina-based education organizations. [6371; gov]

  • $150,000

    50can · Washington, DC · 2023

    Core organizational support for hawaiikidscan, an education advocacy organization committed to ensure that hawaii has an excellent and equitable education system [5898; pc]

  • $150,000

    Social Finance · Boston, MA · 2023

    Proposal to serve as hawai'i renewable learning fund manager [6086; pc]

  • $150,000

    University of Hawaii Foundation · Honolulu, HI · 2023

    Hawaii p-20 core support 2022-2025 [5465; pc]

  • $150,000

    Hawaii Alliance of Nonprofit Organizations · Honolulu, HI · 2022

    General operating support for hano to strengthen and unite the nonprofit sector to improve the quality of life in hawai'i [5471; pc]

  • $150,000

    University of Hawaii Foundation · Honolulu, HI · 2022

    To provide financial support that increases matriculation to windward community college by deserving public high school students in windward o'ahu [5196; pc]

  • $150,000

    University of Hawaii Foundation · Honolulu, HI · 2022

    Hawai'i p-20 core support 2022-2025 [5465; pc]

  • $145,000

    Purple Maia · Aiea, HI · 2024

    For the expansion of halau hekili, a middle college high school on the campus of windward community college. [6277; pc]

  • $140,000

    Castle Medical Center · Kailua, HI · 2023

    Startup support to establish a community-based workforce development program to help ko'olaupoko and ko'olauloa residents develop the employability and technical skills necessary to secure higher-wage jobs [5843; pc]

  • $133,083

    Lanakila Pacific · Honolulu, HI · 2023

    Lanakila pacific career path program, a new form of work-based learning support for young people with mild to moderate autism [5677; pc]

  • $132,715

    Hawaii Conservation Alliance Foundation · Honolulu, HI · 2024

    For the next phase of the ahupuaa accelerator, a program to expand watershed-wide community management that has expanded to 46 partners statewide. [6153; pc]

  • $125,000

    Pilina Education Alliance · Honolulu, HI · 2023

    Support of pathway to purpose, a career-based high school program that provides guidance, mentorship and work-based learning opportunities for students. [5658; nc]

  • $125,000

    Castle Medical Center · Kailua, HI · 2022

    To prevent homelessness and secure housing stability for kailua households hit hardest by the covid-19 pandemic by connecting households with rental and utility assistance and other programs [5524; pc]

  • $125,000

    Hui O Hauula · Hauula, HI · 2022

    Ko'olauloa windward o'ahu community action team (cat) eviction prevention & housing program [5467; pc]

  • $125,000

    Kualoa-Heeia Ecumenical Youth Project (Key) · Kaneohe, HI · 2022

    Windward eviction prevention program [5475; pc]

  • $125,000

    Manoa Heritage Center · Honolulu, HI · 2022

    Sam cooke endowed fund [4463; pc]

  • $125,000

    Pilina Education Alliance · Honolulu, HI · 2022

    Support of pathway to purpose, a career-based high school program that provides guidance, mentorship and work-based learning opportunities for students [5658; nc]

  • $125,000

    University of Hawaii Foundation · Honolulu, HI · 2022

    Develop a malama 'aina plan for moku o lo'e that grounds it in its cultural heritage and guides it through the changing climate ahead [5586; pc]

  • $120,000

    Resources Legacy Fund · Sacramento, CA · 2024

    To help advance the holomua initiative and the care for aina now coalition (formerly green fee) environmental capital formation work [6125; pc]

  • $120,000

    Hui Malama O Ke Kai Foundation · Waimanalo, HI · 2022

    Flood remediation to reduce the risks of flooding damage at this important waimanalo-based center for education and youth leadership development.[5599; pc]

  • $120,000

    Kupu · Honolulu, HI · 2022

    Kupu 'aina corps [5503; pc]

  • $115,000

    The American Ai Forum Aka Ai Education Project · San Francisco, CA · 2024

    To deliver professional development that helps hawaii public school teachers better understand artificial intelligence (ai) and how to responsibly incorporate ai literacy into their curriculum. [6286; pc]

  • $115,000

    Kualoa-Heeia Ecumenical Youth Project (Key) · Kaneohe, HI · 2023

    To establish a community-based workforce development program to help ko'olaupoko and ko'olauloa residents develop the employability and technical skills and training necessary to secure higher-wage jobs [5848; pc]

  • $111,814

    University of Virginia · Charlottesville, VA · 2023

    Provide the good jobs hawaii project team with a learning and evaluation partner that can offer actionable insights and ongoing analysis of how the initiative is helping to prepare and place local residents into high-de read all
  • $110,968

    Purple Maia · Honolulu, HI · 2023

    To support the launch of windward community college's halau hekili, an alternate learning space for high school students attending kailua high that connects high school, college and community learning experiences [5787; read all
  • $105,000

    Waimanalo Health Center · Waimanalo, HI · 2022

    Support for preconstruction activities leading to ola i ka wai phase ii, a major renovation of its aging original suite of buildings, resulting in more effective health and social services for koolaupoko residents [5593 read all
  • $103,163

    College Summit Inc Dba Peerforward · Washington, DC · 2024

    To scale a promising peer counseling model to four additional high schools. [6267; pc]

  • $100,000

    C&C of Honolulu Office of Climate Change Sustainability and Resiliency · Honolulu, HI · 2024

    To help the honolulu city & county optimize its climate adaptation work aligned with the foundation's new climate strategy [5860; gov]

  • $100,000

    Hawaiian Islands Land Trust (Hilt) · Honolulu, HI · 2024

    To continue to work in close partnership with the trust for public lands to secure priority lands for community use and aina aloha mindset development in windward oahu. [6259; pc]

  • $100,000

    New Teacher Center · Santa Cruz, CA · 2024

    To work alongside the hawaii department of education in building the support and resources that enable complex area leaders to bring effective mathematics coaching to their school communities [6372; pc]

  • $100,000

    City and County of Honolulu Office of Climate Change Sustainability and Res · Honolulu, HI · 2023

    To help the honolulu city & county optimize its climate adaptation work aligned with the foundation's new climate strategy [5860; gov]

  • $100,000

    Kuaaina Ulu Auamo (Kua) · Kaneohe, HI · 2023

    To support and strengthen this critically important backbone organization and its three community-driven networks for ocean management in hawaii. [5598; pc]

  • $100,000

    Maui United Way · Wailuku, HI · 2023

    Unsolicited flexible grant to maui united way to build their capacity to help provide relief to those directly impacted by the wildfires on maui, to support community organizations providing that relief, and to help in read all
  • $100,000

    The Trust for Public Land · Honolulu, HI · 2023

    To help trust for public land (tpl) and its partner, the hawai'i land trust (hilt) continue their efforts to secure priority lands in windward o'ahu for community use and benefit [5851; pc]

  • $100,000

    University of Hawaii Foundation · Honolulu, HI · 2023

    To provide financial support that increases matriculation to windward community college by deserving public high school students in windward oahu [5196; pc]

  • $100,000

    50can · Washington, DC · 2022

    General operating support for hawaiikidscan, an education advocacy organization committed to ensure that hawai'i has an excellent and equitable education system [5581; pc]

  • $100,000

    Hawaiian Island Land Trust (Hilt) · Honolulu, HI · 2022

    Windward o'ahu wahi pana initiative (y3) [5484; pc]

  • $100,000

    Paepae O Heeia · Kaneohe, HI · 2022

    Strengthening the ko'olau 'aina aloha network through shared vision and efforts [5517; pc]

  • $100,000

    Pilina Education Alliance · Honolulu, HI · 2022

    Oceanit high - a high school career-based learning program [5398; nc]

  • $100,000

    Resources Legacy Fund · Sacramento, CA · 2022

    Strengthening holomua: marine 30x30 [5521; pc]

  • $100,000

    Teach for America (Tfa) · Honolulu, HI · 2022

    Support to sustain teach for america-hawai'i's work to close the achievement gap [4585; pc]

  • $95,000

    Conservation International Foundation · Honolulu, HI · 2024

    Puulau project: a two-year effort to combine additional knowledge bases from fishers and community with wester-science based monitoring data to improve participation and decision making for the holomua initiative. [5588 read all
  • $95,000

    Conservation International Foundation · Honolulu, HI · 2023

    Pu'ulau project: a two-year effort to combine additional knowledge bases from fishers and community with wester-science based monitoring data to improve participation and decision making for the holomua initiative. [558 read all
  • $85,000

    Bobby Benson Center · Kahuku, HI · 2022

    Support to gap-fund youth outpatient services and to strengthen staffing and data collection across a 12-month period [5557; pc]

  • $80,000

    College Summit Inc Dba Peerforward · Washington, DC · 2023

    Peers leading peers through higher education [5516; pc]

  • $80,000

    Leadership Instituue Hawaii Department of Education · Aiea, HI · 2023

    Laying the foundation for middle level education magic: strengthening public middle schools in hawaii [5920; pc]

  • $76,103

    Hawaii Workforce Pipeline · Kailua, HI · 2022

    Windward work-based learning initiative [5152; pc]

  • $75,000

    Koolau Foundation · Kaneohe, HI · 2024

    Catalyst funding to develop the haiku valley cultural preserve [5907; pc]

  • $75,000

    Kualoa-Heeia Ecumenical Youth Project (Key) · Kaneohe, HI · 2024

    To bolster response to the little fire ant in koolauloa and koolaupoko through grassroots community education, training, monitoring, and response [6133; pc]

  • $75,000

    The Pacific American Foundation (Paf) · Kaneohe, HI · 2024

    For the launch of an esports development program in windward oahu schools [6127; pc]

  • $75,000

    Connected the National Center for College and Career · Berkeley, CA · 2023

    Provide support to connected: the national center for college and careers to design, test and launch the first phase of a community of practice for small high schools in rural and remote regions of hawaii [5927; pc]

  • $75,000

    Koolau Foundation · Kaneohe, HI · 2023

    Catalyst funding to develop the haiku valley cultural preserve [5907; pc]

  • $75,000

    Paepae O Heeia · Kaneohe, HI · 2023

    Strengthening the ko'olau 'aina aloha network through shared vision and efforts [5517; pc]

  • $75,000

    Resources Legacy Fund · Sacramento, CA · 2023

    Strengthening holomua: marine 30x30 [5521; pc]

  • $75,000

    50can · Washington, DC · 2022

    General operating support for hawaiikidscan [5429; pc]

  • $75,000

    Partners in Care - Oahu'S Continuum of Care · Honolulu, HI · 2022

    Windward landlord engagement program [5497; pc]

  • $75,000

    Pbl Works · Novato, CA · 2022

    Scaling high quality pbl in hawai'i - expanding and deepening leadership training in cohorts 4 and 5 [5294; pc]

  • $73,500

    College Summit Inc Dba Peerforward · Washington, DC · 2022

    Peers leading peers through higher education [5516; pc]

  • $70,000

    College Summit Inc Dba Peerforward · Washington, DC · 2024

    Peers leading peers through higher education [5516; pc]

  • $70,000

    Elemental Excelerator · Honolulu, HI · 2023

    Community-driven climate technology deployment in hawaii: more closely connecting emerging climate-resilience technologies incubated by elemental excelerator with the on-the-ground needs of local community groups and en read all
  • $70,000

    Collaborative Support Services (Css) · Honolulu, HI · 2022

    Commit to keiki 2022 [5418; pc]

  • $70,000

    Windward School District · Honolulu, HI · 2022

    Project based learning (pbl) for windward district and organizations [5426; gov]

  • $67,500

    50can · Washington, DC · 2024

    Core organizational support for hawaiikidscan, an education advocacy organization committed to ensure that hawaii has an excellent and equitable education system [5898; pc]

  • $67,500

    Public Schools Hawaii Foundation · Honolulu, HI · 2024

    To launch a new effort that combines human and artificial intelligence to expand student support by offering more personalized navigational guidance and improving academic performance through targeted interventions. [62 read all
  • $66,667

    Council for Native Hawaiian Advancement · Honolulu, HI · 2022

    To prevent homelessness and secure housing stability for windward o'ahu families hit hardest by the covid-19 pandemic through rental and utility relief [5454; pc]

  • $65,000

    University of Hawaii Foundation · Honolulu, HI · 2023

    Support to increase retention of students at windward community college and strengthen the relationships between students and faculty, along with strengthening the relationships between instructional faculty and counsel read all
  • $65,000

    Polynesian Voyaging Society · Honolulu, HI · 2022

    Challenge grant to strengthen the polynesian voyaging society's capacity to lead a movement of sustainability based on revived indigenous wisdom and to support the moananuiakea voyage throughout the pacific [5535; pc]

  • $63,592

    University of Hawaii Foundation · Honolulu, HI · 2023

    Uh system student basic needs outreach & education program [5544; pc]

View all 302 grants →

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Source: IRS Form 990-PF, Part XV, as filed by the foundation. These are grants already paid — a record of what this funder backs, not an open call.