There's some bad advice in this thread.
Unless you work under the table for cash you will need a work permit to work in canada, which gets you the cdn equivalent of a US social security number. Few employers will sponsor you to get one if you are doing basic seasonal work. The reason that ski resorts in Canada are heavily populated with young aussie's and Brits and Kiwis is that there is an arrangement among commonwealth countries that makes it very easy for younger citizens of those countries (25 and under) to work in other commonwealth countries, so there's a whole crew of aussies and cdns on the never summer plan, working resorts alternatively in the northern and southern hemispheres. As a US citizen if you were to come up north and apply for a job at the local subway restaurant for example they would ask you for your goverment provided social insurance number, which all employers must collect from each employee - it's used to ensure taxes are paid and so on. To get one you need a work permit, which is not typically easily obtained unless you have special skills that are identified under the North American Free Trade Agreement (NAFTA).
Consider living like a monk in the US, working three jobs, and stacking up cash and then coming up here and living like a snowboarding monk, never miss a powder day b/c you have no job to get in your way. Or consider gettting a resort job in the US where you can work and ride.
Canada welcomes you in your youthful male amercianness to come up here and ride our snowy wonderland, and spend your greenbacks freely, and maybe even consort with our Canadian ski bunnies at their discuretion, but you can't take jobs from our own youthful canadians or their commonwealth pals, without applying to the government to do so.
Last edited by Lamps; 10-05-2012 at 02:49 PM.