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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


Year Round

Camp Ondessonk is open year round for groups of all kinds. Whether you want a quiet weekend with your family or want to bring 200 sixth graders for a week of environmental education, Camp Ondessonk’s Year Round programming will meet your needs.  It is advised that groups make reservations several months in advance – especially larger groups wanting meals and programs and for dates during the busier months of April, May, September, and October.  Call (618) 695-2489 x129 or email greg.santen@ondessonk.com


Request Reservation


Our new online service request form is your one-stop for all year-round reservation request: Outdoor Education, Retreats, and Open Camping.



Learn More:

  • Outdoor Education Groups– Schools can bring their students to Camp year-round for outdoor or environmental education.
  • School Retreat Groups – Custom-designed package programs for class retreats and religious-based groups. 
  • Weekend Adult and Youth Retreats – More information on great weekend retreats for youth and adults coming soon!
  • Facility Rental and Weekend Groups – Organize your weekend getaway, family vacation, scout trip, etc.
  • Open Camping – See a list of available weekends for your group’s visit to Camp.
  • Day Hiking – Camp is open to day visitors at most times during the non-summer months.
  • Year-Round Spots to Stay – See photos of our cabin units and tent areas.
  • Things to Do – Camp is open in non-summer months for hiking, camping, and more!
  • Calendar of Events – Find out what events Camp has planned throughout the year; onsite, offsite, and virtual.
  • St. Noel Center – Information and photos of The St. Noel Center and its accommodations for lodging.


Ondessonk Maps

Ondessonk Rules and Regulations


If you have any questions, please feel free to contact:

Greg Santen – Guest Services Director


(618) 695-2489 ext. 129

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