The wedding of the 30-year-old actress and Polish, will take place in Montana, reported Ace Showbiz.
Bosworth revealed their engagement last summer. She called her beau "fiance" when writing a blog post about their trip to Seoul, South Korea.
"My fiance, Michael Polish, and I venture out to discover Changdeokgung Palace. As soon as we enter, it is like magically being transported to a different world - this awe-inspiring, sprawling place was originally built in 1405," Bosworth had posted.
Details of their nuptials are unclear, but the bride-to-be was seen leaving an Oscar de la Renta store in Los Angeles earlier this month.
Before seeing Polish, Bosworth was linked to Orlando Bloom and Alexander Skarsgard.