The park is not closed, but is only open to the public when school is not in session.

Please see this link: http://www.hcps.org/harfordglen/About%20Us/HoursOfOperationPage.html

PUBLIC HOURS:

Weekends only beginning the first weekend in April through the last weekend in October, 7:00 AM to 7:00 PM on Saturdays and Sundays.
Over the summer when school is not in session, seven days per week, 7:00 AM to 7:00 PM, beginning in June after the last day of school for HCPS students and ending in August before school begins for HCPS staff.
November 1 to March 30: Closed to public; open for school business only.
A general rule to remember is if Harford County Public Schools are in session, then Harford Glen is closed to the public.