Krispy Kreme is adding a blueberry version of its Original Glazed doughnut for just 4 days

The doughnut features dough infused with blueberry flavor, topped with Krispy Kreme's Original Glaze. Customers can purchase the doughnut by the piece or dozen, either at participating locations or by ordering ahead through the chain's app and website, subject to availability, the company said.

Krispy Kreme is pairing the release with a deal: customers who buy any dozen at regular price can add a dozen of the blueberry doughnuts for $5. The offer is available at participating U.S. and Canadian locations, with a limit of two per guest in-store and one per guest for online orders. Customers ordering through the app or website should use the promo code BLUEBERRY at checkout, the company said.

"Nothing says summer quite like blueberries, and we're bringing that peak-of-season flavor to our iconic Original Glazed doughnut," Alison Holder, chief product and brand officer at Krispy Kreme, said in a statement. "The Original Glazed Blueberry Flavored Doughnut is a fun, delicious way to savor one of summer's sweetest moments while it's here."

The company described the launch as a nod to National Blueberry Month and peak blueberry season.

Krispy Kreme has made a pattern of short-window flavored Original Glazed releases in recent months. In May, the chain introduced an Orange Dreamsicle Original Glazed doughnut, also available for four days, with a comparable deal structure that offered a dozen for $5 with the purchase of any regular dozen. That release followed a Strawberry Original Glazed doughnut that had a similarly brief window on the menu.

The blueberry launch also comes shortly after Krispy Kreme marked its 89th anniversary on July 17 with a deal offering a dozen Original Glazed doughnuts for 89 cents with the purchase of a dozen at regular price, according to AOL.