Education Outside has developed this very convenient Google Calendar of school garden grants. Click the add button on the bottom right to add it to your Google Calendar. Use the "agenda" view to see all the upcoming grants in a list.
The Kitchen Community's Grant List
Captain Planet Foundation External Grants List
San Diego Master Gardeners Association's School Garden Grant List
A list of grants for school gardens arranged by application due dates. Grant Resources
Slow Food USA School Garden Program Grant Lists
Gardening ABC's School and Community Garden Grant List
A list of various grant programs across the nation.
GrowNYC Garden Grant List
California Farm to School Network's Grant Listings
Visit their site and click on Grant Opportunities to see newly listed funding opportunities related to school food and gardening.
National Farm to School Network's resources: Farm to School Fundraising Ideas
USDA Healthy Meals Grants Resource Library has grant searching tools.
Grant Wrangler Funding Directory 
Grant Wrangler is a free grants listing service that makes it easy for teachers to find funding. Search for grants by keywords or subscribe to their monthly e-newsletter.
SPARK Grant Finder
The SPARK Grant Finder Tool helps you locate funding for your Physical Education, After School, Early Childhood or Coordinated School Health Program. Grants can be used for curriculum, teacher training, or equipment.
Grant Writing Tips From and WholeKids and FoodCorps