Spring fever hits the Windy City as springlike warmth during the middle of winter prompts PJ and Bobby to hold a picnic in the park...but a crucial life decision complicates the outing. Meanwhile, Kenny begins a new relationship, and Mike tries vainly to emulate actor Mathew McConaughey by buying a dog and a Jeep.

The gang's dynamics are stirred up when PJ forms a bond with one of Stephanie's friends. Elsewhere, Kenny and Mike make friends with a customer, a counselor which Andy can't stand. Meanwhile, Brendan deals with a new business partner who is unreliable.