Monday marks Casimir Pulaski Day in Illinois, but who was Pulaski and what does the holiday celebrate? Here’s what to know about the holiday: Who was Casimir Pulaski? Pulaski was a Polish-born cavalry officer killed in the Revolutionary War.

Casimir Pulaski Day 2025 falls on March 3, honoring General Casimir Pulaski, a hero of the American Revolutionary War. Celebrated mainly in Chicago and Illinois, the day recognizes Pulaskis role as the “Father of the American Cavalry.

Chicago and Cook County services and offices, courthouses, public libraries, garbage collection and more are closed Monday, March 3 in observance of Casimir Pulaski Day. Chicago Public Schools and other suburban school districts previously observed Pulaski Day,

Pulaski Day honors Casimir Pulaski, a Polish-born general who fought in the American Revolution. The holiday is observed in Illinois on the first Monday of March, near Pulaski’s birthday on March 6.

Monday is Casimir Pulaski Day which honors the revolutionary war hero from Poland. Forensic pathologist Dr. Michael Baden shared his theory on the "unusual" circumstances that may have led to the deaths of Gene Hackman, his wife Betsy Arakawa and their dog.