Yes, Costco will be open this Monday. Its warehouses will be open during regular business hours from 9 a.m. to 08:30 p.m. for Executive Members. Meanwhile, Gold Star and Business Members can stop by from 10 a.m. to 08:30 p.m.

Most grocery stores remain open on Martin Luther King Jr. Day, including Wegmans, Tops, Costco, Aldi, as well as Target and Walmart. If you're unsure whether a store is open, you can call or check online to confirm before heading to the store.