Yes it free make Reservation @ Baltimore recreation and park. Create account for you, your kids, spouse.
Ess early bird swim sessions (6am and 8am, tues, thurs, sat) are $50 for the 2021 seasons. There may be a waiting list. You will still need to schedule. All other sessions are free. Have a look online on Baltimore city parks and Recreation website.
It's free just make a reservation online
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