Crowd snapshot.
August averages about 672,000 recreation visits, roughly 92% of the July high, so it behaves like July for planning. Lodging and campgrounds stay full, and there is no overflow anywhere in the park. The Colter Bay Marina is the first service to wind down: NPS listed its 2026 season as May 22 into August, water levels permitting. Everything else is still running, and the campgrounds and lodges stay full.
| Field | Value |
|---|---|
| August recreation visits (5-yr mean) | 672,439 |
| Share of July's peak | 92% |
| Crowd band | peak |
| Park's busiest month (5-yr mean) | July |
| Park's quietest month (5-yr mean) | December |
Weather snapshot.
The Moran 5WNW station records an August normal high of 76.0°F and a normal low of 40.4°F, with 1.28 inches of precipitation and no snowfall normal. It is the second warmest month and among the driest. Afternoon storms are still common in summer, and NPS's advice does not change: get to a safe place before the storm hits, and get off the lake if you are boating. Nights cool hard on the valley floor even after a warm day, which is worth packing for. By August the mountain trails and passes that NPS says may not clear until late July are normally open.
| Field | Value |
|---|---|
| Average high (°F) | 76.0 |
| Average low (°F) | 40.4 |
| Precipitation (inches) | 1.28 |
| Snowfall (inches) | 0.0 |
| Weather band | warm |
| Station | Moran 5WNW HCN, WY at 6,805 ft |
Access snapshot.
Every main road runs its full season. Road work is the only constraint, and it moves: the park has run projects at the Moose Entrance junction, on Menor's Ferry Road, at the north end of the Moose-Wilson Road and on the North Park Road toward Yellowstone, with timed delays and one-lane sections. Read the NPS road construction page before you plan a drive. The Colter Bay Marina's 2026 season was May 22 into August, water levels permitting (NPS hours page). August 25 is on the 2026 fee-free list (NPS fees page). For the closures and restrictions in force, read the current conditions page.
| Field | Value |
|---|---|
| August access score (0-100) | 100 |
| Year-round route | US 89/191 and US 26/287 through the east side of the park, plowed all winter from Jackson to Flagg Ranch. The Teton Park Road is closed to cars November 1 through April 30 from the Taggart Lake Trailhead to Signal Mountain Lodge, and the Moose-Wilson Road November 1 until mid-May. Secondary roads such as Antelope Flats and Schwabacher close seasonally based on conditions. |
| Verify current road and conditions status | Official NPS Grand Teton roads page |
Seasonal events.
August is the most reliable stretch for the high country, once the passes have cleared. Down low, the wildlife viewing pattern holds: bison and pronghorn on Mormon Row and Antelope Flats Road, elk in the Blacktail Pond meadows during the cooler hours, and moose, otters, ospreys and eagles at Oxbow Bend. Some of the Mormon Row buildings close off and on for stabilisation work, so check current conditions if a particular barn is the point of the drive. Night skies are a quiet strength here. Grand Teton runs an active night-sky research and lighting program with Boise State's Sensory Ecology Lab to cut light pollution while keeping stargazing intact. Bear spray, groups of three and the 25-yard and 100-yard distances all still apply.
Audience verdict.
August is the month for the mountains. The passes are normally clear, the weather is at its most settled, and the whole park is running. The tradeoff is that it is still close to peak for crowds and prices. Hikers get the best window of the year for a canyon-to-pass day. Families get warm lake afternoons, though the Colter Bay Marina may already be done for the season. Photographers should plan around afternoon storms and take advantage of the dark skies. RV travelers should expect full campgrounds and check the road construction page before any drive toward Yellowstone.
Common questions.
Is August a good time to visit Grand Teton?
August runs the busiest time of year at Grand Teton, about 92% of the July peak, with warm weather (average highs near 76°F). Expect the year's heaviest crowds.
How crowded is Grand Teton in August?
August averages about 672,439 recreation visits, roughly 92% of Grand Teton's busiest month (July). That puts it among Grand Teton's busiest months.
How much of Grand Teton is open in August?
In a typical August, 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.
Independent site. Not affiliated with or endorsed by the National Park Service. Data comes from the official NPS Visitor Use Statistics Data Package, 2025; editorial analysis is ours. The NPS Arrowhead and other NPS marks are not used.