Donate Now Register For Camp Reservation Request

Donate Now!

Be the puff in our marshmallow, the volume in our cheers,
the reason we make Incredible Camp O Campers.

Support Camp Ondessonk with a gift to our Annual Appeal!

Donate Online Here


Ondessonk Outdoor Education

kidintreeCamp Ondessonk’s mission of providing exceptional outdoor adventures doesn’t end when our last summer campers head for home. Since 1988, we have been providing interdisciplinary Outdoor and Environmental Education programs for Catholic and non-Catholic schools from Illinois, Missouri, Indiana, and Kentucky. In keeping to our mission year-round, Camp Ondessonk serves over 1,500 students a year in our unique and rustic setting; ideal for experiential learning – that is, learning by doing. 

Fill out the reservation form to begin the process of bringing your students to Ondessonk for an unforgettable learning experience.


Request Reservation


It is advised that schools make reservations several months in advance – especially larger groups and for dates during the busier months of April, May, September, and October.  Call (618) 695-2489 x129 or email greg.santen@ondessonk.com.

Camp Ondessonk ADULT Waiver (Age 18+)

Camp Ondessonk MINOR Waiver (Under Age 18)

All visitors, program participants, students, teachers, adult chaperones, regardless of age, are required to sign a waiver. Children not attending with their parent must have one signed prior to arrival.



The Program Planning Packet will answer many questions about program curriculum, lodging, meals, etc. that teachers and parents may have about Camp. 


Ondessonk Maps

Ondessonk Rules and Regulations

Year-Round Lodging


For more information and questions about reservations, please contact:

Greg Santen

Guest Services Director
Email: greg.santen@ondessonk.com
Phone: 618.695.2489 x129

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