Tunnel Tales: Summer are "Entertaining and Fun for Everyone". And while they may not all be hilarious, the few that arent will engage your imagination, capture your heart and warm your innards.
Theres a roof (road) overhead, chairs are provided and the parks restrooms should be open. But, the tunnel is open at both ends and this is Cache Valley. So, it would behoove you to dress appropriately and come prepared for the prevailing temperatures and conditions.