Yellowstone is the original — the world's first national park, set aside in 1872 — and it earns the title every year. 2.2 million acres, 10,000 thermal features, the densest concentration of large mammals in the lower 48. A weekend isn't enough, but it's enough for a focused first visit. Here's the route.
Day 1 — Mammoth and Norris
Enter the park from the north (Mammoth Hot Springs, near Gardiner, Montana). Mammoth's travertine terraces are the most-photographed feature in the upper park. Walk the boardwalks (1-2 hours). Drive south to Norris Geyser Basin — the hottest, most dynamic basin in the park (Steamboat Geyser has erupted irregularly the last few years; check the visitor center for predictions).
Camp at Madison or Norris campgrounds. Reserve 6 months out at recreation.gov.
Day 2 — Old Faithful and the Upper Geyser Basin
The headline feature deserves a full morning. Old Faithful erupts every 90 minutes (the visitor center predicts each eruption). But the surrounding Upper Geyser Basin is the real magic — Castle Geyser, Grand Geyser, Riverside Geyser are all within a 1.5-mile walk. Bring lunch; spend 4 hours.
Afternoon: drive Firehole Lake Drive and Fountain Paint Pots. Sleep at Madison again or push to Lake Yellowstone for tomorrow.
Day 3 — Lamar Valley and Hayden Valley
Wildlife day. Lamar Valley in the northeast is the 'Serengeti of North America' — bison herds, wolves at dawn, sometimes grizzlies. Drive in pre-dawn. Bring binoculars. Sit at any pullout and wait — you'll see something.
Late morning, drive south to Hayden Valley. Bison are nearly guaranteed; wolves and bears are possible. Stop at Mud Volcano on the way through.
What to pack
- Layers — Yellowstone summer mornings are 30°F, afternoons 70°F
- Bear spray (mandatory in our opinion; many trails are in grizzly country)
- Hiking boots (boardwalks are paved but trails are rough)
- Water + filter (creeks are abundant but treat all water)
- Bear-resistant food canister if camping in backcountry
- Binoculars — wildlife spotting
- Patience — the best moments come from waiting at pullouts
The first rule of Yellowstone: don't approach the wildlife. The second rule: don't step off the boardwalks. The thermal features are 200°F at the surface; the crust is fragile and people die every few years.
Where to base
For a weekend, Madison or Lake Yellowstone campgrounds are central. Hotels (Lake Hotel, Old Faithful Inn) are landmark stays — book 9-12 months out. Towns just outside the park (Gardiner, West Yellowstone, Cody) are cheaper alternatives.
Combining with neighbors
Most Yellowstone trips combine with Grand Teton (1 hour south). 5-7 days for both is a more relaxed pace.
Yellowstone-ready kit: backpacks and hydration. Plan the full trip: Yellowstone destination page.