Grand Teton in September.

Crowd snapshot.

September averages about 564,000 recreation visits, roughly 77% of the July high, so it is noticeably lighter than August with most of the same access. The closing calendar is the thing to plan around. In 2026 the Laurance S. Rockefeller Preserve Center closed September 20, Colter Bay Tent Village September 7, Lizard Creek Campground September 13, and Jenny Lake Campground, Colter Bay Campground, the Colter Bay Visitor Center and Jenny Lake Boating all on or around September 27 to 30. Gros Ventre, Signal Mountain, Colter Bay RV Park and Headwaters run into October. The Craig Thomas Discovery and Visitor Center stays open to October 31.

Weather snapshot.

The Moran 5WNW station records a September normal high of 66.3°F and a normal low of 33.6°F, with 1.64 inches of precipitation and a 0.4-inch snowfall normal. That snowfall figure is the first of the season and a fair warning: at 6,805 feet, September can turn. Nights sit at or below freezing by the end of the month. Days are comfortable for long hikes, and the summer storm pattern thins out. Pack for both ends of the range, since a warm afternoon and a frozen dawn can happen in the same 24 hours on the valley floor.

Access snapshot.

The Teton Park Road stays open to cars until November 1 (NPS Grand Teton roads page). September is also when the park's autumn construction closures start, and they have taken the north end of the Moose-Wilson Road out of service well before its November 1 seasonal closure; read the NPS road construction page and the current conditions page before you plan a drive or a trailhead. Jenny Lake Boating's 2026 season was May 15 to September 30 (NPS hours page). September 17 is on the 2026 fee-free list.

Seasonal events.

Fall arrives without a schedule. NPS describes quaking aspens as most commonly turning yellow in fall and sometimes holding color for several weeks depending on the health of the stand, and it publishes no peak week. For aspen it names Willow Flats Overlook, Snake River Overlook, Oxbow Bend and Two Ocean Lake; for narrowleaf cottonwood, the Gros Ventre River, Cottonwood Creek and Schwabacher's Landing. Black hawthorn turns red along the Moose-Wilson Road and at the Laurance S. Rockefeller Preserve, where parking is small and fills early. The elk rut is a documented sign of fall here: bulls gather harems, bugle and spar, a sound that carries in the early evening. Bull moose spar too. Keep 25 yards back.

Audience verdict.

September is the month most visitors should aim at. Cooler days, lighter crowds, the same roads open until November 1, and fall color starting without a fixed date. The catch is that services close through the month, so check what is still running for your dates. Photographers get aspen and cottonwood color and bugling elk at dusk. Hikers get the best conditions of the year, with cold mornings. Families lose Jenny Lake Boating at the end of the month, which changes the Hidden Falls walk from 1 mile to 5. RV travelers keep Gros Ventre, Signal Mountain, Colter Bay RV Park and Headwaters into October.

Common questions.

Is September a good time to visit Grand Teton?

September runs busy at Grand Teton, about 77% of the July peak, with mild shoulder-season weather (average highs near 66°F). It is one of the busier months, though not always the single peak.

How crowded is Grand Teton in September?

September averages about 564,320 recreation visits, roughly 77% of Grand Teton's busiest month (July). That lands it in the middle of Grand Teton's year for crowds.

How much of Grand Teton is open in September?

In a typical September, about 100% of Grand Teton's road network (weighted by how important each route is) is open to wheeled vehicles. Road-opening dates shift year to year, so check the official NPS page for current conditions before you go.

Methodology

Monthly recreation visits come from the official NPS Visitor Use Statistics Data Package, 2025 on NPS IRMA Stats; the statistic shown is Recreation Visits, the 5-year mean for 2021-2025. Climate normals come from NOAA NCEI's 1991-2020 U.S. Climate Normals at Moran 5WNW HCN, WY (station USC00486440, 6,805 ft elevation). The access score weights named park roads by route importance for typical wheeled-vehicle openings that month. Road dates, the Jenny Lake Boating season and lodge and campground windows move year to year. This page carries typical seasons and the year's published schedule, not today's status: for closures, construction and restrictions in force, read the NPS Grand Teton current conditions page and the road construction page, and confirm dates on the official NPS Grand Teton page before booking. Independent site, not affiliated with the National Park Service.