West Entrance – West Yellowstone, MT
🚗 98–112 min (~1.6 hr)US-191 south from Four Corners through Gallatin Gateway, the Gallatin Canyon and past Big Sky to West Yellowstone
West Entrance road to Madison/Old Faithful/Norris open to cars April 17 – October 31, 2026 (projected); oversnow (guided snowmobile/snowcoach only) Dec 15, 2026 – Mar 15, 2027.
Website ↗ source
North Entrance – Gardiner, MT (Roosevelt Arch)
🚗 88–95 min (~1.5 hr)I-90 east over Bozeman Pass to Livingston, then US-89 south through Paradise Valley to Gardiner
Only park road open to regular vehicles year-round: North Entrance → Mammoth → Tower → Lamar Valley → Northeast Entrance/Cooke City. Mammoth–Norris open Apr 17 – Oct 31, 2026.
Website ↗ source