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Great Chesapeake Bay 4.4 Mile Swim & 1 Mile Bay Challenge

Sun June 9, 2024 Stevensville Libby's Coastal Kitchen, MD 21666 US



Great Chesapeake 4.4 Mile Bay Swim

9:30AM EDT - 3:30PM EDT
Open to ages 13 - 99.


Libby's Coastal Kitchen (Formerly Hemingways)
357 Pier One Road-
Stevensville Libby's Coastal Kitchen, MD US 21666


This event benefits the March of Dimes, the Chesapeake Bay Trust, the US Coast guard, and other local charities. 


We are excited to announce the return of the Great Chesapeake Bay Swim for 2024!!!! You will find one site this year ( with all of your information, and an easy new address for any questions ( 

Race Day is June 9th, 2024, with an 9:30am start time for the 4.4 Mile Swim. We are currently planning on having the 1 Mile Swim begin at 8:30am, so that we can have an awards ceremony earlier for them. This is subject to final approval. 

Don't forget, our newly designed site ( and our email of are your sources for all of your up to date information!!!




Don't forget to follow us on Facebook at !!


The 4.4 Mile Swim is FULL!!!! Congratulations to the 650 swimmers who have accepted their entry to this historic event. For those of you who weren't able to make it, please consider our 1 Mile Bay Challenge option. 

We ARE opening up a waiting list for the 4.4 mile swim, to show you interest, but please keep in mind that we factor in no-shows in our accepted number of swimmers. We are going to TRY this waitlist process this year, but it is certainly not a guarantee. 





2024 Ask The Race Director Video

Race Contact Info

If you have any questions about this race, click the button below.

RJA Perseverance Award

RJA Perseverance Award
The third annual Perseverance Award, sponsored by the Robert J. Astheimer Memorial Foundation, will be presented at this year's GCBS.

The Award will recognize one or more individuals who have overcome a physical, mental or emotional challenge to enable a personal achievement and/or to make significant contributions to family, community, or country.

The award is open to swimmers and their family members, GCBS organizers and supporters. Nominations of no more than two pages should be sent to the Foundation Director, JoAnn Milliken, at, by April 30, 2024. Nominations will be reviewed by the Foundation's Board of Directors. The Perseverance Award comes with an honorarium of $1000. For more information about Bob Astheimer and the foundation, please visit

Race Day Splits

Thank you to our friends over at Crossing Currents Aquatics for putting together this amazing infographic

Pay attention to the 100 yard times. These will help you to judge where to seed yourself for the swim start this year!


Geek out on distances

For the 1 Mile swim.... 

All buoys remain on your RIGHT hand side. Clockwise swim

Leg 1 of the swim -750 yards

Leg 2 of the swim - 440 yards

Leg 3 of the swim - 580 yards


4.4 Mile Swim  (approximate locations of Mile locations) 

From the Beach to the Bridge - @430 yards

Right after the curve in the bridge - 1 Mile Mark

Near the end of the 1st Shipping Channel (2nd large concrete support structure) - Mile 2

Right around the center of the 2nd Shipping channel opening - Mile 3

Right after you cross from under the Bridge (Almost Done!!!) - Mile 4

The last stretch is ROUGHLY 700 yards to the finish, and you will find it gets shallow as you get near closer to the end. 



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