Ben from Damn Arbor notes that the juneberries in town are in bloom, which means that it shouldn't be more than about a month before they are ready for street-side snacking.
The forager in me always welcomes street trees that provide impromptu nutrition. Arborwiki has a brief list of some of the places where you can find juneberries downtown; surprisingly, the municipal parking lots on the west side of downtown are ringed with these trees. Keep your eyes open and get to them before the birds do.