Is it hot at Grand Teton?

Grand Teton: alpine sun, open valleys, and shade that lives in the forest

Elevation keeps the air around Grand Teton cool even in July, afternoon highs sit near 75°F, but it also sharpens the sun, and the park's most famous ground offers little cover from it. The valley floor of Jackson Hole is open sagebrush flat with the peaks rising beyond, and the lakeshores and overlooks that draw people are exposed to the sky. The shade here is real but it's in the forest, not out on the flats where the classic views are. Planning around that is what makes a summer day comfortable.

Sagebrush flats versus forested trails

Grand Teton's shade character splits cleanly. The forested trails along the base of the range and around the lakes run under conifer canopy and stay cool through the day. The open sagebrush valley, the turnouts, and the lakeshore viewpoints are fully exposed. On a July afternoon the sun stands about 61 degrees high at 3 PM on a southwest bearing near 227 degrees, so shadows from the peaks and tree stands reach toward the northeast. Save the exposed overlooks and flat valley walks for morning, and use the shaded forest trails when the sun is high overhead.

Cool air, strong light

The mild temperature at Grand Teton hides how much sun you're taking on. At this altitude the atmosphere is thinner, and open water and any lingering snow reflect extra light back at you.

• Wear sunscreen and sunglasses on the open flats and lakeshores; 75°F doesn't mean the sun is gentle here.
• Carry water on exposed hikes, where there's no shade to rest in until you reach the trees.
• Use the long day at both ends, sunrise around 5:54 AM, sunset near 9:02 PM, to be out during the softer, cooler light.

There's no heat season to dodge in the Tetons; the temperature stays mild through summer and cold the rest of the year. The real limiter is snow and access, the high trails open late and close early, making July and August the practical window, which is also when the sun is at its strongest and highest.

The best light is also the coolest

Grand Teton photographs and feels its best in the early morning and late evening, when the low sun lights the peaks and the valley air is coolest. Those same hours spare you the strongest overhead sun on the exposed flats. The midday period gives you flat, harsh light and full exposure on the open ground, the time to be under the forest canopy on a shaded trail rather than out at a sun-struck turnout.

To see how the range and the forest edges cast shade across the valley at your planned hour, check the satellite shadow view for Grand Teton before you head out.