Heritage Day is an annual celebration of the history and culture of the Borough of Hellertown and surrounding Lower Saucon Township. The event is sponsored by the Hellertown and Lower Saucon historical societies and the Saucon Valley Conservancy.

Heritage Day 2026 will be held May 16 at two locations: the 1761 Heller-Wagner Grist Mill Complex off West Walnut Street in south Hellertown, and the Michael Heller Homestead along Saucon Creek, adjacent to the Water Street Bridge connecting Hellertown and Lower Saucon Township.

Heritage Day will be expanded in 2026 to honor the 250th anniversary, also known as the semiquincentennial, of the founding of the United States.