Rates for most National Park services are increasing nationwide, so the rates may increase for the 2019 season.
Other local guides suggest to wait until beginning of spring and Summer, which might be April to September. Now, they have -20 or even -40°C. So it's very hard to he there. I suppose everything is closed during winter
Yes
Yes the shuttles will be up and running again in about mid to late May (depending on the weather)
Park shuttle closed down in September until the spring
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