30 Days of Biking is back for its fifth year

Over the bridge to Nicollet Island
Racers make their way across the Hennepin Avenue bridge to Nicollet Island during Stupor Bowl 17 in Minneapolis February 1, 2014.
Courtney Perry / For MPR News

A sure sign of spring is the return of 30 Days of Biking, when riders pledge to get on their bicycles every day during the month of April. Now in its fifth year, it's grown from a local event into an international phenomenon. This year, more than 5,000 pledges have come in from all over the country and points around the world. Also this year, the effort champions a cause: Every 30 pledges secures a donation from Free Bikes 4 Kidz.