Grand Teton National Park

Soaring over a landscape rich with wildlife, pristine lakes, and majestic alpine vistas, the Teton Range stands as a testament to generations of stewards. For over 11,000 years, communities have thrived in the valley known as Jackson Hole, turning these mountains into more than just peaks-they embody imagination and enduring human connection.

Weather & conditions

Grand Teton National Park has long, cold winters-snow and frost are possible any month. April, May, & June - Mild days and cool nights alternate with rain and snow. July & August - Warm days and cool nights prevail, with afternoon thundershowers common. September, October, & November - Sunny days and cold nights alternate with rain and occasional snowstorms. December to April - Between storms the days are sunny and nights are frigid. Snow blankets the mountains and valley.

What this latitude gives you

From 43.8° north, anything above declination +46.2° is circumpolar here: it never sets, so it is available on every clear night of the year. Anything below declination -46.2° never clears the horizon at all.

Full astronomical darkness survives the summer here, but the window is narrow around the solstice. From late August the nights lengthen quickly.

We do not hold a measured Bortle class for this site, so treat the sky as unknown until you have taken a reading of your own.