In that case, Nasdaq will close at 1:00 pm Eastern Standard Time. You can see the Nasdaq holiday calendar here. There are also pre-market and after hours trading sessions available, also known as Extended Markets. For Nasdaq, pre-market trading hours are 4:00 am to 9:30 am, Eastern Standard Time. After hours runs from 4:00 pm to 8:00 pm, Eastern Standard Time. Certain brokers have different pre-market and after hours trading times (for example, TD Ameritrade limits pre-market trading between 8:00 am and 9:15 am).