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Harold K.L. Castle Foundation Nearshore Marine Resource Conservation grants

From Harold K.L. Castle Foundation

Project grants from a Hawaii foundation to nonprofits working on nearshore marine resource conservation around the main Hawaiian Islands. Inquiries go in any time; full proposals are invited by the foundation.

Rolling

Apply any time

Go to the funder’s call page
Checked Nov 6, 2026

The facts, in the funder’s words

How to apply

Apply directly

When a call is open, eligible applicants apply to the funder or the organisation running the call.

If you are a grant seeker whose 501(c)(3) organization or public school can further the foundation's strategic priorities, please click here for more information about applying online 

Amount

$100 to $4,000,000 USD

Range across all foundation grants; average about $110,000.

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

Work to apply

Steps not stated

Chance of funding: not published · Is it worth your time?

Where

Hawaii: United States

More grants in United States and North America.

Nearshore Marine Resource Conservation (for waters surrounding the main Hawaiian Islands) 

Who can apply

NGOs

Nonprofit organizations (recognized by the IRS as a 501(c)(3) and 509(a) public charity) 

Rounds

Rolling: apply any time

Online Inquiry Forms will be reviewed by foundation staff on a rolling basis, so they may be submitted at any time during the year. 

Co-funding required

Not found on the pages we read

Restoration approach

Coasts and oceans and Community conservation

Our classification, from the funder’s description of what it supports.

More grants for coasts and communities.

Is it worth your time?

How to read it
 
 
 
 
 

Few funders publish their odds: ask, or guess low. Count every stage, and reports if you win. Rates of November 6, 2026 from ExchangeRate-API.

– per hour of work

The call

Rolling

Online inquiry (rolling)

No deadline statedCall page
Status

Rolling: apply any time

Online Inquiry Forms will be reviewed by foundation staff on a rolling basis, so they may be submitted at any time during the year. 

Deadline

No deadline: apply any time

Ready to apply to Online inquiry (rolling)?Go to the funder’s call page

What the funder asks grantees to report

Reporting

Not found on the pages we read

Something wrong?

Every fact above links to the page we read it from. If a deadline, amount or rule has changed, report a problem and we will check it against the funder’s page. Are you this funder? Correct this listing.

Both open an email to contact@naturefunding.org with this listing filled in. Listings can’t be bought.