May in Yellowstone National Park is a good month: highs around 58°F, lows around 33°F. Crowds: moderate — #4 busiest of the park's 12 months. Bison calves and bear watching at their best; some passes still shut. The editorial best window here is June & September.
| Verdict | Good A solid visit with a caveat — usually crowds or heat. |
|---|---|
| Temps °F | 58° high / 33° low |
| Crowds | moderate · #4 busiest of the park's 12 months |
| What May is like | Bison calves and bear watching at their best; some passes still shut |
| Best window (whole year) | June & September |
| Peak crowds (whole year) | Jul–Aug |
CROWDS: RELATIVE SEASONALITY FROM NPS VISITATION STATISTICS · TEMPS: APPROXIMATE NOAA NORMALS AT MAIN VISITOR ELEVATION — HIGH COUNTRY RUNS 10–20°F COLDER
Yellowstone National Park in June — Best window, highs around 68°F, crowds: busy (everything open, long days — wolf watching in lamar valley).
Our verdict for May is "Good". A solid visit with a caveat — usually crowds or heat. Expect highs around 58°F and lows around 33°F, with crowds at the "moderate" level. Temperatures are approximate NOAA normals at the main visitor elevation; crowd levels follow published NPS visitation statistics.
Across the full 12-month review, the best window is June & September, and the peak-crowd months are Jul–Aug. May itself we rate "Good".
June we rate "Best window" against "Good" for May, with highs around 68°F and crowds at the "busy" level.
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