High Season: June to August
Sailing during this season: In the months from June to August, temperatures in Alaska are at their warmest, and conditions are quite moderate, making it pleasant. An important factor for some travellers is that the further into summer you are, the better your chances of seeing wildlife on the various expeditions. With so many ships now sailing into Alaska, there can also be a tremendous amount of congestion in the small port towns. To get a better price, you may also consider northbound glacier routes rather than southbound routes, as these tend to be cheaper.
Shoulder Season: May and September
Sailing during this season: In May and September, the crowds are often smaller, and prices are slightly cheaper due to the weather and the high possibility of snow. May and September are the start and tail end of the traditional Alaskan summer cruise season; however, it is still a very pleasant time to experience the majestic wilderness of Alaska without the bustling summer crowds.