Yellowstone Park......right down the road!
Visting Yellowstone Park while you are staying in Big Sky is easy. The West Entrance into the park is just 45 minutes south of Big Sky.
Hire a guide. They will save you time and will explain in detail what you are seeing and why it is there. Information is limited in the park should you travel without a guide.
If your interested in seeing the backcountry and getting off the beaten path you will be especially greatful for a guide. Grizzly bears are common in the backcountry and can be a bit tricky to deal with. Plus, if you are interested in seeing bears you will need a guide to take you where the bears are.......which is not next to the road!
In winter, the bears are hibernating and the park is closed to vehicles. You will have to travel by snowcoach or snowmobile through the West Entrance if you are interested in seeing geysers. On the other hand, you can travel the long way around and enter the North Entrance 1.5 hour drive and see the northern range of the park by vehicle. This is where I take folks out to view wolves in winter.
Note: During drought years the park may not be open during the winter months. The park is also closed in mid-October until about X-mas to allow snow to build on the roadway. The park is also closed in late winter from about mid-March through May to allow crews to clear the roads of snow.
I have access to portions of the park year round and is never closed for me and my guests.