Now in its third year, the all-day event will begin at 9 a.m. on Saturday.
Downtown business owners created Winterfest as a way for people to shake off the winter blues.
The event includes such activities as food tastings, crafts and much more.
"There will be cornhole out in [West Market] Square, and a juggler sponsored by Camden National Bank. We'll have a hula hoop artist out there. Just lots of fun and activity out in the square," said Cheryl Michaud, owner of West Market Square Artisan Coffeehouse.
Many of the downtown restaurants and bars will have discounted food and drinks throughout the afternoon.
Retail stores will also be holding sales. A full schedule of events can be found at downtownbangor.com.