A massive lightning strike just jolted parts of Colorado—and it’s a timely reminder for everyone in Boulder: when thunder roars, go indoors. With our city’s high elevation, dramatic terrain, and frequent summer storms, Boulder is one of the most lightning-prone areas in the state. Whether you’re hiking the Flatirons or walking along Boulder Creek, being informed could literally save your life.

Why Boulder is a Lightning Hotspot

Boulder sits at the base of the Rocky Mountains, where warm air from the plains meets cooler mountain air, often creating powerful afternoon thunderstorms. These systems can appear rapidly—especially in the summer—and lightning can strike miles from the storm’s core. Outdoor adventurers, beware: those cloud build-ups over Green Mountain or Bear Peak may look beautiful, but they can turn dangerous in minutes.

Boulder Reservoir

Top Places to Avoid During a Lightning Storm

While every outdoor area carries risk during a lightning event, Boulder has a few places where caution is especially critical:

• Chautauqua and Flatirons trails: High elevation and minimal cover make these lightning magnets.

• Boulder Reservoir: Open water is extremely dangerous—get out immediately if you hear thunder.

• Flagstaff Mountain: Popular for views, but extremely exposed during fast-moving storms.

• Boulder Creek Path: A scenic favorite, but wide open stretches can leave you vulnerable.

Lightning Safety Tips for Boulderites

Here’s what to do when the clouds roll in:

• Follow the 30/30 Rule: If you hear thunder within 30 seconds of seeing lightning, seek shelter.

• Head for a building or hard-topped vehicle, not a tent or under a tree.

• Avoid open spaces, hilltops, and ridgelines.

• Stay away from water, metal fences, and electronic devices.

• If caught outside with no shelter, crouch low on the balls of your feet—don’t lie flat.

Download a lightning tracker or the NOAA Weather Radar app to stay ahead of fast-developing storms. These real-time tools can alert you before the first thunderclap.

Know Before You Go

Planning a hike or bike ride? Check the Boulder-specific National Weather Service forecast before heading out. If there’s even a slight chance of thunderstorms, start early and aim to be off high trails by noon. Remember, Colorado ranks in the top five for lightning fatalities in the U.S.—and Boulder County sees some of the highest strike densities in the state.

Local Emergency Resources

• Sign up for Boulder County Alerts to receive real-time storm warnings.

• In an emergency, call 911 and report any fires or injuries related to lightning.

• For daily safety updates and public announcements, keep an eye on the City of Boulder Office of Emergency Management.

Lightning in Boulder is no joke—but with the right preparation, awareness, and timing, you can stay safe and enjoy Colorado’s wild weather from a safe place. After all, there’s no better show than thunderheads forming over the Flatirons—just make sure you’re watching from indoors.

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