Massive Mayfly Swarms Descend on Louisiana

Incredible video captures the annual natural phenomenon outside New Orleans

Apr. 1, 2026 at 4:43am

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A new video has captured the annual mayfly swarm event near Mandeville, Louisiana, just outside of New Orleans. The video shows massive clouds of the short-lived insects taking over the area as part of their mating ritual, leaving behind piles of bodies once the swarming ends.

Why it matters

Mayfly swarms are a regular occurrence in Louisiana, signaling the arrival of summer and the start of the insects' brief adult lifespan. While an impressive natural sight, the sheer volume of mayflies can create hazardous driving conditions and leave a messy aftermath that local communities must clean up.

The details

The video, shot this week, shows the mayflies swarming in thick clouds near Mandeville, a town just north of New Orleans. Viewers of the local WDSU news station also reported seeing the insects covering their cars. Mayflies emerge from nearby freshwater sources when their wings develop, taking to land to mate before dying within 24-72 hours.

  • The mayfly swarm video was captured this week in early April 2026.
  • Mayfly season typically occurs annually in Louisiana during the spring and summer months.

The players

Mandeville, Louisiana

A town located just north of New Orleans that experiences regular mayfly swarms during the spring and summer seasons.

WDSU

A local New Orleans news station that received viewer reports and photos of the mayfly swarms.

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The takeaway

The annual mayfly swarms in Louisiana are a remarkable natural phenomenon, but also a nuisance for local residents who must contend with the insects' short-lived but overwhelming presence each year. The sheer volume of mayflies can create hazardous driving conditions and leave behind a messy aftermath, underscoring the delicate balance between nature's cycles and human communities.