The Lamar Valley in the northeast is the wolf-watching capital of the world. Packs are watched at distance through spotting scopes from pullouts along the road, usually at first light, with bison herds, pronghorn and coyotes on the valley floor. The regulars who gather at these pullouts with radios and scopes are generous with sightings — ask politely and you will see far more than you would alone.

The Hayden Valley in the centre is the grizzly valley, with bears working the meadows and the Yellowstone river, huge bison herds and, in autumn, elk. Traffic jams at sightings are constant; arrive before sunrise.

The Mammoth and Gardiner area in the north holds elk year-round, and is the reliable place to see them at close range — including through the September rut, when bulls bugle in the town itself.

The geothermal basins are worth doing for their own sake, and thermophile life in the hot springs is genuinely part of the park's biology rather than a distraction from it.

May and June are the best months: bears emerge with cubs, bison calve, and the valleys are green. September and October bring the elk rut and fewer people. Winter turns the park into a different destination, with wolves easiest to spot against snow and access by snowcoach only.

Practicalities

Stay in Gardiner, Cooke City or the northern park lodges if wildlife is the priority; the northern road between them stays open year-round while most of the park closes to cars in winter.

Bring optics. Nearly all the best sightings here are at distance, and a spotting scope or good binoculars is the single biggest upgrade to a Yellowstone trip. Keep 100 yards from bears and wolves and 25 from bison and elk — bison injure more visitors here than any other animal.