The pool operates from Saturday, May 18 until Sunday, September 15 with the hours shown below. Please check the Calendar for Swim and Dive Team Meets, holiday, and special event hours. Note that the pool closes Wednesdays at 4:45pm during Home “B” Swim Meets and opens at Noon when Merrimack is hosting Saturday “A” Swim Meets. The diving well closes on Sundays at 3:00pm for Dive Team Home Meets. Call the pool at 301-229-6579 (in season only) for inclement weather updates.

Closing time is the time that the facility actually closes and that users are expected to vacate the pool deck. Accordingly, pool users are asked to exit the pool 10 minutes prior to the closing hour and/or conclude their use of the bathhouse before closing time in order to be ready to leave the pool at closing time and to enable the staff to perform clean up and closing activities.


The pool is available on weekday mornings 6:30am-7:30am June 17 through August 23. There is no additional charge but everyone using the pool during the Early Bird swim hours must sign-in upon arrival. Early Bird Swimmers must be 18+ years of age.


Refer to the lap lane schedule below. Merrimack makes at least one lap lane available at all times, including Swim Team practice times. Two lap lanes are typically installed at other times. The number of lap lanes may change due to pool events or at the discretion of pool management.

May 18 – May 19Saturday – Sunday11:00am – 8:00pm
May 25 – May 27
Memorial Day Weekend
Saturday – Monday11:00am – 8:00pm
May 28 – June 13Monday – Thursday3:00pm – 8:00pm
Friday3:00pm – 9:30pm
Saturday – Sunday11:00am – 8:00pm
June 14 – August 30Friday11:00am – 9:30pm
June 15 – August 29Monday – Thursday11:00am – 9:00pm
Saturday-Sunday 11:00am – 8:00pm
July 4
Independence Day
Thursday10:00am – 6:00pm
August 30 – September 2 Labor Day WeekendFriday – Monday10:00am – 8:00pm
September 3 – September 20Monday-Friday4:30pm – 7:30pm
September 7-8, September 14-15 & September 21-22Saturday – SundayNoon – 6:00pm
Until June 172 laps lanes11:00am – 4:30pmMonday – Thursday
1 lap lane3:30pm – 7:30pm
2 or more laps lanes7:30pm – Close
1 lap lane3:30pm – 6:00pmFriday, June 14
June 17 – July 192 laps lanes11:00am – 4:00pmMonday – Thursday
1 lap lane4:00pm – 7:30pm
2 laps lanes7:30pm – Close
1 lap lane4:30pm – 6:00pmFriday
After July 192 lap lanesSee Pool Open Hours AboveSee Pool Open Days Above