“Mifflin” almost always refers to the Mifflin Street Block Party in Madison, Wisconsin, which is held every year on the last Saturday in April.

Quick Scoop: When is Mifflin?

  • The party is an annual block party on Mifflin Street in Madison, WI.
  • It happens on the last Saturday in April each year.
  • In 2025, that was listed as Saturday, April 26.

For future years, students and locals usually just look at a calendar, circle the last Saturday in April, and assume that’s “Mifflin” unless the city or UW announces a change.

In student forums and social chats, people will simply ask “When is Mifflin?” and others reply with the date of that last April Saturday and talk about house parties, music, and the heavy police presence.

Other “Mifflin” events (in case you meant something else)

There are a few unrelated things also called “Mifflin”:

  • Mifflin County Youth Fair (Mifflin County, PA): held August 3–8, 2026.
  • Governor Mifflin “Community Days” festival in PA: June 26–July 4, 2026, at Governor Mifflin Intermediate School.

If you tell me which one you meant (Madison block party, Mifflin County fair, Governor Mifflin festival, etc.), I can narrow it to the exact calendar dates you’re looking for. Information gathered from public forums or data available on the internet and portrayed here.