Here is a good site:
http://www.wildlife.state.nh.us/Wild...ame/snakes.htm
Of the 11 species in NH, only the
extremely rare rattler is dangerous. There is only one known den left in the state and if it was in your area the locals would have heard about it. The exact location is not published as they are an endangered species in NH.
If over a long time you encountered 100 shakes in NH, the cumulative danger to you would be much less than one drive to the local store and back in your auto.