Yellowstone crowd calendar.

Yellowstone's crowd calendar, month by month.

Each bar is a calendar month's average recreation visits over the last five years (2021-2025), shown as a share of Yellowstone's own busiest month. The full numbers are in the table below, and every month links to its own detailed page.

Reading the shape of the year.

Yellowstone's crowd calendar is shaped like a tall, narrow tent. July sits at the top near 923,000 average visits, with June (about 831,000), August (820,000), and September (796,000) close behind, so the four core summer months read as one long plateau of heavy traffic. Then the walls fall away fast. May holds about 55% of the July peak, October about 33%, and every other month drops into single digits.

That shape is unusual even among the big western parks, and it comes almost entirely from the road calendar rather than from weather or interest. Yellowstone's interior loop roads close to regular vehicles for roughly half the year, so November through April never gathers a real crowd. November is the single quietest month at about 24,000 visits, roughly 3% of July, and December, January, February, and March all sit in the same low band while the park runs on snowcoach and snowmobile access only. There is a small quirk in that trough: November, not deep-winter January, is the lowest point, because early November catches the interior roads closing to wheeled vehicles before the winter snowcoach season has fully opened, so it dips briefly below the frozen months on either side of it.

The practical read: if your trip has to land in summer, the difference between months is small because June through September are all near the top. The bigger lever is the two shoulder months. May reopens the interior in stages with far fewer people than July, and late September into October drops crowds by a third or more while most roads are still open. Those are the windows where the calendar actually rewards a crowd-averse visitor, and they are the reason the shoulders matter more here than the exact summer month you pick. For the full weather, road-opening, and best-window verdict rather than just the crowd shape, see the best-time-to-visit page.

The shoulder window

The shoulder window is May (roads reopening, about 55% of peak) and October (roads starting to close, about 33%). Both thin the crowd meaningfully while much of the park stays open. For the full "so when should I actually go?" verdict, which weighs crowds against weather and road access, see the Yellowstone best-time-to-visit page.

How to read this calendar

Every number here is a five-year monthly mean of Recreation Visits (2021-2025) from the official NPS Visitor Use Statistics Data Package, 2025. Each bar and table row is that calendar month averaged across the last five years, so one odd weather year or one road closure does not swing the shape. The "share of peak" column expresses each month against Yellowstone's own busiest month, which is the honest way to compare a quiet month with a loud one. One limit worth stating plainly: this is monthly data, so it tells you which months are busy, not which days or weekends. For within-the-month timing, a holiday week or a summer weekend still runs busier than a plain weekday, but our data cannot measure that. Independent site, not affiliated with the National Park Service.

Common questions.

What is the busiest month at Yellowstone?

July, averaging about 923,000 recreation visits over the last five years. June, August, and September are close behind, so the whole June-through-September stretch is peak season.

When is Yellowstone least busy?

November, at roughly 24,000 average visits, about 3% of the July peak. Most interior roads are closed to wheeled vehicles then, so the low count reflects limited access as much as low demand.

How do I avoid crowds at Yellowstone?

Target the shoulder months. May runs near 55% of the July peak as roads reopen, and October near 33% as they begin closing. Both thin the crowd while much of the park is still reachable. See the best-time page for the full verdict.

Is Yellowstone crowded in late September?

Less than in summer. September averages about 86% of the July peak overall, but crowds ease notably after Labor Day as school resumes, which is why late September is a popular lower-crowd window while roads stay open.