Keith Broomfield, who had no military training, is believed to be the first US citizen to die fighting alongside Kurdish forces against IS.
Broomfield, 36, will be buried Wednesday at a private ceremony following a morning funeral at Grace Baptist Church in Hudson. A wake will be held at the church Tuesday evening.
Broomfield, a plant manager at his family's Bolton-based business, Broomfield Labs Inc., died June 3. His body arrived in Boston's Logan Airport on Saturday via a Turkish Airlines plane.
Kurdish officials have said Broomfield died in battle in a Syrian village near the town of Kobani on the Turkish border and that hundreds of people came out to bid farewell to the American before his body was handed over to his family at a Turkish border crossing.
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The YPG posted a video online in which Broomfield says he was in Syria "to do what I can to help Kurdistan. With everything that's been going on, it seems like the right thing to do."
"I just want to help the cause anyway I can," he said.