We require passports or passport cards on all trips. You must bring your passport or passport card (you must use one or the other) to check in and it must be with you on the boat. We must have your passport information to complete your reservation for manifest purposes. We will need full name (as on the passport/passport card), passport/passport card number, expiration date, and date of birth. You can fill out our passport form (available here) or call/email the information to our office.
Although keep in mind in Montana summer comes last and does not last very long usually lasts until 2nd week of August or 3rd week of August then winter comes ! Yes it can snow in August in Montana, it is not rare to see it ! Usually by the end of August you will see it snow ! Then from Sept. - April 15 you have winter agian.
Temperature & Precipitation. Montana Weather Factoids. January 11, 1980: The temperature at the Great Falls International Airport rose from -32Â°F (-36Â°C) to 15Â°F (-9.4Â°C) in seven minutes as warm Chinook winds eroded an Arctic airmass. This 47 degree (26.6 Celsius) rise in seven minutes stands as the record for the most rapid temperature change registered in the United States.