Costco Wholesale provide grants and donations to 501c3 organization which focus on children, education or health and human services. Smaller local nonprofits may apply for grants and donations at the closest warehouse location. Organizations with more of a regional focus should apply for grants by sending a regional donation request form to the regional office.
There does not appear to be any specific application dates, but you should expect it to take at least 4 weeks to receive a response from Costco. However, it is recommended that you apply at least 3 months before you expect the funds to be needed. Factors that are considered when your application is reviewed include: type of program, community need, how program results will be measured, community collaboration, other financial support of the program or activities and budgeted expenses.
Costco generally limits its grants to no more than 10% of total program budget. You will be required to complete a grant application and provide such information as mission, use of funds, and financial information.
More information can be found on the website of Costco.