Flash flooding is the dominant threat at Zion National Park, with 8 recorded flash flood events in Washington County — more than any other hazard in the data. The canyon's narrow slot formations funnel stormwater with almost no warning, and rain falling miles away can send a wall of water through a dry riverbed minutes later. Thunderstorm winds added 5 more recorded incidents, compounding the risk during summer monsoon season.
Before entering any canyon — especially the Narrows or Zion Slot Canyon Trail — check the National Weather Service forecast for the entire watershed, not just the trailhead. Download the Zion-specific flash flood alert notifications through the NPS app, and carry a waterproof dry bag to protect essentials if water rises fast. If skies darken upstream or thunder rumbles at any distance, move immediately to high ground rather than waiting to see whether the storm intensifies.
Top recorded hazards in Washington County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Flash Flood 8
- Thunderstorm Wind 5
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About Zion National Park
Follow the paths where people have walked for thousands of years. Gaze up at massive sandstone cliffs of cream, pink, and red that soar into a brilliant blue sky. Experience the tall, stretching walls of a narrow slot canyon. Zion’s unique array of plants and animals will enchant you as you absorb the rich history of the past and enjoy the excitement of present-day adventures.
Weather
Zion is known for a wide range of weather conditions. Temperatures vary with changes in elevation and day/night temperatures may differ by over 30°F. In summer, temperatures in Zion National Park often exceed 100°F/38°C. Zion experiences monsoons from mid-July into September that result in an increased risk of flash floods. Always be aware of the threat of storms and lightning and be prepared for a wide range of weather conditions. Winters are generally mild.