Did a little over a month this year. Near the end of May to begining of July. We went for the icebergs, & saw plenty. Winter was late letting go this year so it was cold. Saw a snowflake or two first week of June.
No reservations anywhere but as June wore on CGs were getting busy, not so much visitors but locals on weekends. The people are wonderful, even if you can't understand half of what they are saying. Just nod in agreement. It does have something of a Northern feel to it though it is not very far north. Only about the same latitude as the Northern States/Canada line. No midnight sun.