I think the going rate is around $100 per $10K insured value. Tractors usually go under your home/farm policy. Call around to your local mutual farm insurance companies for competitive quotes. Your insurance rates depend on where you live.
i'm in Ontario, i understand every province may be different......
I'm at about 460/yr for the tractor, for replacement value (fire theft etc) It had to be combined with a commercial business policy however. I did (well, best to cya) need the commercial portion because i use it for deliveries and some landscaping work.
The liability (even personal) nor damage was not covered under my home owners policy.
In ontario from what i could find, you don't need insurance to operate on the public roads.
OP, my policy is with Wawanesa.