You can make Salt Lake City to Yellowstone National Park in about 5 hours, but the people who love this drive never do it in one straight shot. At around 320 miles on I-15 and US-20, it is short enough to start after breakfast and long enough to earn a night somewhere memorable close to the park gates.
Open this route in XCRSNLeaving Salt Lake City
Aim to clear Salt Lake City before the morning rush, or after it, never in it. Fill the tank on the edge of town where prices usually drop, set the playlist, and settle in for the first 214 miles to Idaho Falls.
The headline stop on this route is Old Faithful. Leave real time for it; it sets the tone for the whole trip.
Idaho Falls, the last stretch
Idaho Falls sits about 214 miles in. It is the natural place to stop for the night: hotels are plentiful, rates beat the big-city ends of the route, and you wake up with the hardest miles already behind you.
Nearby, Grand Prismatic Spring is worth the short detour if the day is going well.
Rolling into Yellowstone National Park
The final 106 miles always go faster than you expect. Save a little energy for Mesa Falls Scenic Byway; it is a fitting finish.
By the end you will have seen Old Faithful, Grand Prismatic Spring and Mesa Falls Scenic Byway, and you will understand why this corridor is a classic.
When to go and how to pace it
One night is the sweet spot. Idaho Falls, ID or West Yellowstone, MT is where most people stay, so book ahead on summer weekends.
Check live gas prices along I-15 and US-20 before you go; they can swing a lot from one state or county to the next. XCRSN prices every leg for your exact car.
