Iowa Storm Season: When It Peaks and How to Prepare
By the Des Moines Water Damage team · September 19, 2026
Iowa's severe storm season generally runs from April through August, with the heaviest concentration of severe thunderstorms, hail, and tornado activity in May and June — though damaging storms and flooding can happen at any time of year in the Greater Des Moines metro.
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When Storm Risk Peaks
Central Iowa's severe weather season typically ramps up in April, peaks through May and June with the highest frequency of severe thunderstorms and tornado watches, and gradually tapers through the summer. Hail and straight-line wind events remain a risk through August, and heavy rain capable of causing flash flooding can occur throughout the warmer months.
Before Storm Season: What to Check
- Roof condition. Have any missing or curled shingles repaired before storm season — small issues become bigger ones once wind and hail get involved.
- Gutters and downspouts. Clear debris so heavy rain drains away from your foundation instead of pooling against it.
- Sump pump. Test that it actually activates and consider a battery backup, since power outages often accompany severe storms.
- Trees near the house. Have dead or overhanging limbs trimmed before high winds can bring them down on your roof.
During an Active Storm
Stay away from windows during high wind or hail, and if you hear dripping or see water entering during the storm, note the location for after it passes — but don't attempt roof repairs during active weather.
After the Storm
Once it's safe, do a visual check from the ground for missing shingles, damaged siding, or fallen branches. If you spot damage or suspect a leak, call for an inspection — hail damage in particular often isn't visible from the ground and can lead to leaks weeks later if it goes unchecked. See our flood risk guide for river- and creek-corridor specific concerns.