Officials say minors will not be able to go into the shopping mall without an adult over the age of 23 after 2 p.m.
The new curfew is in response to recent disturbances involving dozens of unaccompanied young people.
Earlier this month, Philadelphia police had to disperse large crowds of juveniles around the area.
"There's so many fights, they just run around over this wall here and police have to come in and clear them," noted Jacob Kramer from Fairmount.
Previously, a similar curfew was in place in the Fashion District, but only for weekends. Now it will be in effect daily.
Fashion District officials say anyone who appears to be 18 or under may be approached by security or law enforcement to provide proof of their age.
Employees who are under the age of 18 and are showing up for work past 2 p.m. will be asked to show identification stating where they are employed. This will not affect their ability to work at the center during these hours.
Fashion District officials noted they have the full support of the city in implementing this new policy.
The curfew will remain in effect until further notice.
The Philadelphia Police Department says the responsibility of checking ID for mall entry falls on the Fashion District security, while police officers will respond to crime.
The department released this statement on the curfew:
"The responsibility of enforcing the Fashion District's new code of conduct falls on private security hired by the mall. Police Officers working in the Fashion District and the surrounding area are responsible for enforcing laws and assisting members of the public.
The PPD will continue to work collaboratively with private security at the Fashion District to ensure safety for patrons, workers, and all who travel through the area."