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Park Crowd Calendar

How we calculate crowd scores

Every crowd score on Park Crowd Calendar comes from the same transparent formula, applied identically to every park. There is no editorial thumb on the scale — the numbers are derived directly from federal visitation records. Here is exactly how it works.

The four steps

  1. Take the three-year monthly mean. For each park and each calendar month, we average the recreation visits reported in the NPS Visitor Use Statistics over the last three full calendar years. Using three years smooths out one-off spikes (a weather event, an anniversary) and gives a stable picture of a typical month.
  2. Normalize against the park's own peak. We divide each month's mean by that same park's busiest month to get a percent-of-peak. So a value of 100% is the park at its fullest, and 25% means that month sees roughly a quarter of peak traffic.
  3. Map it to a 1–10 score. We convert percent-of-peak into a 1–10 score (dividing by ten and rounding up, clamped to the 1–10 range), so the scale is easy to read at a glance.
  4. Label the bucket. Scores group into four plain-English bands: 1–3 Quiet, 4–6 Moderate, 7–8 Busy, and 9–10 Peak.

Why we normalize per park

A quiet month at the Grand Canyon still draws more people than a busy month at a remote park in Alaska. If we ranked parks against each other in raw visitor counts, every small park would look permanently empty and every marquee park permanently full — useless for planning. By comparing each park to its own busiest month, the score answers the question you actually care about: for this park, is this a relatively quiet time to go?

Honest limitations

  • Monthly granularity only.The source data is reported by month. We can tell you July is busier than October, but not that a Tuesday is quieter than a Saturday, or that a holiday weekend or a specific hour will spike — the data simply doesn't contain that detail.
  • Weather figures are normals, not a forecast. The temperatures and precipitation we show are NOAA 30-year climate normals — the long-run average for a month, not a prediction of what the weather will do on your trip. For a live outlook we show a separate 7-day forecast where available.
  • “Visitation” means recreation visits. Our counts are the NPS recreation visits measure. Administrative and non-recreational traffic is excluded, and counting methods can vary between units.

How these pages are made

Every park and month page on this site is generated automatically from this data pipeline, not written by hand. That is deliberate: it means the same rigorous method is applied to every park with no cherry-picking, and that when new federal data lands, every page updates consistently. The methodology on this page — and the sources behind it — is designed and maintained by a real person, Park Crowd Calendar's founder.

See the full list of inputs on our data sources page.