Almot wrote:
Canadian citizens DON'T need a visa for going to the US as visitors, see this section of the same website. Maximum stay is still 183 days, but read this website for possible extensions. To my best memory, extensions can be granted sometimes - will say no more as I don't remember the details, so this would be an "opinion".
The way I had it explained to me is that Canadians do not have to have a visa in thier hand when they enter the US and they do not get a visa stamp in there passport. However, we are granted entry under the rules of a B2 visa and all the rules apply including the normal 6 month limit. Here is another link to more info.
http://canada.usembassy.gov/mobile//visas/information-for-canadians.htmlDefinitely best to talk to US officials directly to get a definitive answer. Breaking the rules can have some serious consequences.