I just checked a bit and Croisièeres AML is doing cruises until October 28 and Croisières Dufour doesn't give any closing dates so I assume that there will be cruises for Oct but will be worth it? Well most of the whales will have departed then except for the endemic belugas and a few lone players from other species.
So I am not 100 % sure if it will be worth it butI would suggest that if you decide to go anyways you select a large boat and not a zodiac because it could be very cold on the river at this time of the year.
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