Over 40 mile of trails accessible via the Swift Current, Thunder Wolf and Explorer chair lifts at Big Sky Resort. | Bike Pass includes access to three lifts, servicing 40+ miles of mountain biking. Bike Haul passes are required for chairlift access to haul mountain bikes. This is a separate pass from all winter ski passes, and is non-transferable and non- refundable. For Summer 2019, Bike Haul passes will provide access to Swift Current, Thunder Wolf and Explorer lifts. Planned opening: Late June/early July, as conditions allow. Bike Haul passes will be available for pick up at the Basecamp building at Mountain Village, during the summer season.