Much more delicate than the brown Northern Walkingsticks (Diapheromera femorata) I posted about last year (Walking Stick Love), when I coaxed this one into some foliage in the front garden it disappeared into it, its colour and shape being such excellent camouflage. Not so much a walkingstick as a walking blade of new grass, or walking stem.
Based on this page at BugGuide, I think this is probably an immature Diapheromera femorata. Based on that and on the fact that there aren't very many species of walkingstick this far north, and this is the most common. Interesting the difference in colour between this and the adult form--suggests to me the possibility that diet changes as life progresses, taking the insect into different habitats.