September in Glacier National Park is a best window month: highs around 68°F, lows around 39°F. Crowds: moderate — #4 busiest of the park's 12 months. Golden larch begins; bears feed hard; crowds fade. The editorial best window here is July–September.
| Verdict | Best window The editorial pick — weather, access and experience line up. |
|---|---|
| Temps °F | 68° high / 39° low |
| Crowds | moderate · #4 busiest of the park's 12 months |
| What September is like | Golden larch begins; bears feed hard; crowds fade |
| Best window (whole year) | July–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
Glacier National Park in October — Shoulder, highs around 53°F, crowds: quiet (sun road closes with the first real storm).
Our verdict for September is "Best window". The editorial pick — weather, access and experience line up. Expect highs around 68°F and lows around 39°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 July–September, and the peak-crowd months are Jul–Aug. September itself we rate "Best window".
October we rate "Shoulder" against "Best window" for September, with highs around 53°F and crowds at the "quiet" level.
Get a heads-up before timed-entry and lottery windows open — plus new guides for the parks you care about.
FREE · NO SPAM · UNSUBSCRIBE IN ONE TAP