Grand Teton in September: Crowds, Weather & What to Pack

Peak crowds · VisitWhen score 67/100 · #5 of 12 months

September is peak season — expect the year's biggest crowds at Grand Teton National Park: crowds run 77% of the July peak (564,320 average visits), days average 66°F with 12.6 hours of daylight. Computed from NPS and NOAA data.

Crowds in September

Grand Teton averages 564,320 recreation visits in September — 77% of what July, the peak month, draws. Trailheads and parking fill accordingly — book early and start days at dawn.

Weather & daylight

Days are mild (highs average 66°F), and mornings are chilly (lows average 34°F). It is typically dry (1.6″ of precipitation). Mid-month daylight runs 12.6 hours.

NOAA 1991–2020 monthly normals, station MORAN 5WNW, WY US (6 mi from park coordinates, 6,805 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of September.

What to pack for Grand Teton in September

Computed from the month's weather normals above — not a generic list.

• Warm mid-layer (fleece or light puffy) — mornings average 34°F
• Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month
• Bear spray — recommended by the park in grizzly country (check current park regulations before you carry)

If your dates are flexible, consider shifting: The computed best months for Grand Teton are April and May.

Common questions

See also: the best national parks to visit in September · Last verified 2026-07-16