I can definitely recommend my friend Dan Pickett and his program, LaunchAcademy (
http://www.launchacademy.com/). Have also heard pretty good things about the shorter-form classes offered by GeneralAssembly in Cambridge (
https://generalassemb.ly/). Neither are located in NH of course, but so it goes :).
Also, though the NH.rb group is no longer meeting on a regular basis, please feel free to drop by the Web Dev Group that I co-organize alongside Josh Cyr. We meet at Alpha Loft in Portsmouth every third Wednesday of the month (next one is this Wednesday). More information here:
Good luck, and welcome to the Ruby community!
..nap