Colorado lightning map
The Front Range and high country fire off frequent afternoon thunderstorms in summer as daytime heating builds over the terrain.
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Detected from NOAA GOES-19 GLM satellite data. Aggregate count for Colorado — your exact location and alerts live in the app.
About lightning in Colorado
Colorado’s lightning is driven by terrain. As the sun heats the Front Range and high country each summer afternoon, air rises along the slopes and builds towering storms that drift onto the plains — a pattern reinforced by the late-summer monsoon. The state leads the nation in lightning fatalities relative to its storm count, largely because hikers and climbers are caught above treeline. From May through August, watching the nearest strike close in gives you the lead time to get below the ridgeline.
- Thunderstorm days/yr
- 45
- US rank
- #15 of 50
- Peak season
- May–August
State thunderstorm-day normals are provisional (NOAA/NWS); per-city climate data is shown where a station normal is published.
Cities in Colorado
Lightning safety in Colorado
The safest call in Coloradoisn’t how many storm days it averages a year — it’s how close the nearest strike is right now. Keep to the 30-30 rule: indoors within 30 seconds of thunder, back outside only 30 minutes after the last. StrikeCast shows that live distance and whether the storm is closing in, so you can move early.
StrikeCast app
Distance, trend & alerts — in your pocket.
GPS-precise distance to the nearest strike, live approaching/moving-away trend, and push alerts for every place that matters across Colorado — home, work, the kids' school.
Your exact location stays on your device. Never shared. Never tracked.
Lightning guides
Frequently asked
How many thunderstorm days does Colorado get?
Colorado averages about 45 thunderstorm days a year, versus a US average near 25 — roughly 1.8× the national norm. Activity peaks May–August.
Where does Colorado rank for lightning in the US?
By mean annual thunderstorm days, Colorado ranks #15 of 50 states. Rankings use NOAA/NWS climate normals; the live distance and trend on this page come from NOAA GOES-19 satellite data.
When is thunderstorm season in Colorado?
Lightning is most frequent May–August in Colorado.
How does StrikeCast track lightning in Colorado?
StrikeCast reads NOAA GOES-19 GLM (Geostationary Lightning Mapper) satellite data, updated continuously, to show how far away the nearest strike is and whether it is approaching or moving away. Save any place in Colorado in the free app to get a push alert when lightning closes in.