Biking in Northern Canada
With a snowmobile, the route is in almost perfect shape right now!
The earliest time you can make it is a bit different from the best time to go. Sounds like you want to make it as enjoyable as possible so I would recommend July or August. The weather is as warm as it gets and in a somewhat normal year as dry as it gets. Camping is enjoyable at that time of year but as those two months are school summer holidays, there will be more travellers on the road. June also is a possibility as around the summer solstice (June 21/22) the days are incredibly long and if you are far enough north the midnight sun is quite an experience. May is certainly doable, but a bit hit and miss with the weather, can be nice, can be cold as stink.
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