A “new journal article”:http://www.vtpi.org/pucher_canbike.pdf investigates Why Canadians Cycle More than Americans:

bq. In spite of their colder climate, Canadians cycle about three times more than Americans… Most of these factors result from differences between Canada and the United States in their transport and land-use policies, and not from intrinsic differences in history, culture or resource availability.

1% or more of residents bicycle to work in only four of fifty states (Oregon, Arizona, Montana, and D.C.), but that number bike in 8 of 12 Canadian provices and territories!