Grand Teton's safety data is remarkably quiet, but the clearest hazard signal comes from thunderstorm wind events, with 2 recorded incidents in the county. While that number is low, the Tetons' dramatic elevation change makes afternoon thunderstorms a reliable summer pattern, and wind-driven lightning strikes above treeline represent the sharpest risk for families spending time on exposed terrain.
When afternoon clouds begin building — typically after noon — move off ridgelines and open meadows immediately and descend to forested, lower-elevation campsites. Pack a weather radio or download the NOAA Weather app before you lose cell signal at the trailhead, and keep a rain shell with a hood accessible in your daypack rather than buried in the car. Scheduling high-exposure hikes for early morning gives you a reliable buffer before storm conditions typically develop.
Top recorded hazards in Teton County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Thunderstorm Wind 2
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About 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
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.