I did that trip in 2007 – from Halifax NS, then around-and-about to California.
I got to Halifax during the last week of June – and finished-up in CA towards the end of September, sticking mainly to the northern half the Continent. Exactly 90 days in all, which saved all the hassle of having to organise an extended visa.
Weather-wise, the timing was perfect.
How long do you intend going for?
If you were to start much earlier in the year than me - i.e. during March/April - then I would be tempted to kick-off further south; enjoy that region first, then head north towards the mid-summer months. It can get mighty hot (and humid) down south from mid-May to September in the southern states.
I’m guessing you intend to ship over with Wallenius Wilhelmsen Logistics, right? In which case consider picking-up your bikes in Charleston or Brunswick instead, particularly if you're starting earlier than May/June.
- Be mindful of Tornado Alley during the American springtime; and
- that the Hurricane Season (Gulf Coast states esp) starts getting 'warmed-up' from around July onwards.
I would be interested to read what our American and Canadian friends have to say about the subject. They'll know more about it than me, for sure.
All the best
Wallenius Wilhelmsen's route.