Great Chesapeake Bay 4.4 Mile Swim & 1 Mile Bay Challenge

Sun June 11, 2023 Stevensville Libby's Coastal Kitchen, MD 21666 US


Registration is closed!!

Great Chesapeake 4.4 Mile Bay Swim

8:00AM EDT - 2:00PM EDT
Open to ages 13 - 99.
1 Mile Swim

Great Chesapeake 1 Mile Bay Challenge

$75 8:00AM EDT - 9:30AM EDT Registration ends June 4, 2023 at 11:59pm EDT


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


SCHEDULE (See Athlete Guide For Details)

5:00 AM – 7:00 AM           Shuttles and Pre-Race Checkin

7:30 AM                            4.4 Swimmer pre-race meeting   (mandatory)

7:45 AM                            1 Mile Swimmer pre-race meeting (mandatory)

8:00 AM                              4.4 Start of self seeded swim waves:    Swimmers will enter in groups of 10, every 10 sec.

                                            (See Video at

8:15 AM                             1 Mile Start – Groups of 100  

11:55 AM                            Final Swimmer 


12:05 PM                            Awards


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

We are excited to announce the return of the Great Chesapeake Bay Swim for 2023!!!! You will find one site this year ( with all of your information, and an easy new address for any questions (

We can't wait to celebrate the 30th year of the Great Chesapeake Bay Swim non-profit, and our 30th year of giving back to the community. Over the past 30 years, we have given back over $3,000,000 to local organizations, and that's all because of YOU!!! To celebrate that accomplishment together, we are happy to announce that this year ALL swimmers will receive a medal for their accomplishment, to commemorate your role in our giving celebration!

Race Day is June 11th, 2023, with an 8am start time. Currently we are planning for the 1 mile AND the 4.4 mile swim to start at the same time (or very close to each other). 

As we move forward with planning for this year, you'll notice a few changes, which we will talk about later! Medals for all, special incentives for longevity swimmers, and lots more to come! 

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



Race Contact Info

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

RJA Perseverance Award

The second 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 2 pages should be sent to the Foundation Director, JoAnn Milliken, at, by April 30, 2023. 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!



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