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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



For those wishing to just kick back and do their own thing, or schedule lodging, meals, or programs a la carte for a family weekend or group event, the following dates are weekends open for group camping and programming  at Camp Ondessonk during the school year.  It is advised that weekend groups contact Camp first to inquire about availability and 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 or email greg.santen@ondessonk.com

Download Reservation Forms, waivers, and maps HERE.


Open Camping Spring 2020

IMG_4062All weekends in March are OPEN.

February 29-March 1 OPEN.  We are also hosting our 6th Annual Maple Sugarin’ Weekend.  More info HERE.

March 28: First-Time Camper Open House. More info HERE.

April 3 – 5: OPEN.  We are also hosting our 4th Annual Waterfalls, Wildflowers, and Wineries Weekend.  Space is limited.  More info HERE.

April 10 – 13: CLOSED for Easter holiday.

April 17 – 19: CLOSED for Spring Lodge Reunion. More info HERE.  Also hosting Stable Round-Up (invite only).

April 24 – 26: CLOSED for Father-Son Weekend.  More info HERE.

May 1 – 3: OPEN

May 8 – 10: OPEN

May 15 – 17: OPEN – This is the last available Spring weekend.  Open for lodging only.  No meals or programs.  

May 18 – August 13: CLOSED for Summer Camp 2020!!!


Open Camping Weekends – Late Summer/Fall 2020

10670063_10152763315065782_161944164873389797_nAugust 14-16: OPEN for limited lodging only.  No meals or programs. Call for availability.

August 21-23: OPEN for limited lodging only. No meals or programs.  Call for availability.  Also hosting The Shawnee Hills 100-Mile Endurance Run.  You must register through the organization’s website HERE.

August 28-30: OPEN for limited lodging only.  No meals or programs. Call for availability.

September 3-7: CLOSED for Friends Weekend. This is an invite-only event. More info soon.

September 11-13: OPEN

September 18-20: OPEN for limited lodging only. Call for availability. All meals and programs are for Fall Family Camp.  More info soon.

September 25-27: CLOSED for Fall Lodge ReunionThis event is for Lodge members only.  More info soon. Camp is also hosting Fall Stable Round-Up.  This is an invite-only event.

October 2-4: OPEN.  Also hosting our first Walking with God Spiritual Retreat.  This is a retreat for adults.  More info HERE.

October 9-11: OPEN for limited lodging only. Call for availability. All meals and programs are for Mother-Daughter Weekend.  More info soon.

October 16-18: CLOSED for Southern Illinois Fat Tire Fest presented by the Bike Surgeon from O’Fallon, IL.  You must register through the Bike Surgeon’s website HERE.

October 23-25: OPEN for limited lodging, no meals or programs.  Our annual Ondessonk Trail Run and Fall Family Fest will be Saturday.  More info soon.

October 30-November 1: OPEN.  Come celebrate Halloween in the woods!

November 6-8 and November 13-15: OPEN

November 19-22: CLOSED for 1st Deer Season

November 25-29: CLOSED for Thanksgiving holiday

December 2-6: CLOSED for 2nd Deer Season


Open Camping Winter 2020/2021IMG_3646

December 11-13 and December 18-20: OPEN for lodging only.  We have heated cabins!

Thursday, December 21, 2020 – Sunday, January 3, 2021: CLOSED for holiday season.

All other weekends in January and February are OPEN.  We have heated cabins!


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

Greg Santen- Guest Services Director


(618) 695-2489 ext. 129

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