Strengthening Windward O‘ahu Communities Grant

Harold K. L. Castle Foundation

Grant amount: US $5,000 - US $2,000,000

Next deadline: Nov 14, 2018 (Full proposal)

Later deadlines: Jan 16, 2019 (Full proposal), Apr 18, 2019 (Full proposal), Aug 14, 2019 (Full proposal)

Applicant type: Government Entity Nonprofit Indigenous Group

Funding uses: Education / Outreach, Applied Project / Program

Location of project: Honolulu County, Hawaii

Location of residency: Hawaii

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Note: Online Inquiry Forms are required before submitting a full proposal and will be reviewed by foundation staff on a rolling basis. Within one month of receipt of your Online Inquiry Form, we will contact you. If you are invited to submit a full proposal, the deadlines are listed above ('Full Proposal' deadline).

Strengthening Windward O‘ahu Communities

Windward O‘ahu Strategy: Building social, human, and natural capital with a particular emphasis towards nurturing future community leaders.

The Harold K.L. Castle Foundation builds on the strengths of vibrant Windward O‘ahu communities through investments that support the region’s rich cultural legacy, its youth and families, and its natural resources.

Like many Hawai‘i-based organizations, the Foundation is rooted in a strong sense of community and place. Prior to creating a family foundation in 1962, Harold K.L. Castle gave generously of his time, energy, and financial resources to the Windward O‘ahu community in which he lived and worked. With an eye toward the future and a vision of building civic and cultural resources, Mr. Castle in his lifetime made substantial gifts of land for Windward churches and schools, and for institutions such as Castle Medical Center and the Windward YMCA. Over its 44-year history, the Foundation has maintained a deep connection to its roots in Windward O‘ahu and a commitment to contributing to the vitality of communities from Kahuku to Waimanalo.

Our Strategy

The Harold K.L. Castle Foundation helps communities build assets in Windward O‘ahu by strengthening and supporting the region’s rich cultural legacy, its youth and families, and its natural resources. Investing in the unique history, traditions, people, and environment of Windward O‘ahu has important implications for the state as a whole, and is an important piece of the foundation’s commitment to “Building Resources for Hawai‘i’s Future.”

Our average grant size is approximately $110,000, but grants range from $100 to $4 million.

You can learn more about this opportunity by visiting the funder's website.


  • Eligible applicants:
    • Nonprofit organizations serving Hawai‘i with Internal Revenue Code Sections 501(c)(3) and 509(a) public charity status
    • Public schools


  • The Harold K.L. Castle Foundation generally prefers not to be the only funder of a given project. 


  • Proposals are not considered for:
    • Individuals or businesses
    • Ongoing operating expenses (unless it is a new project or organization needing start-up funding)
    • Vehicles
    • Computers
    • Endowments
    • Annual fund drives
    • Sponsorships, special events, dinners, galas
    • Organizations based outside of Hawai‘i
    • Projects taking place outside Hawai‘i that do not benefit Hawai‘i

About this funder:

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