SoCal Faces Mosquito Surge After Heavy Rains

Experts warn of exponential growth in mosquito population heading into summer

Published on Feb. 25, 2026

Got story updates? Submit your updates here. ›

Southern California has experienced significant temperature fluctuations in the last two weeks of February 2026, shifting from cooler, active weather to intense, summer-like heat - a pattern experts call 'feast or famine.' This has created ideal conditions for mosquitoes, leading to an early scourge of the annoying pests, with officials reporting five times as many mosquitoes compared to the five-year average.

Why it matters

Mosquitoes can mature in as little as a week and only need a few drops of water to start reproducing, posing a major public health concern as their population grows exponentially heading into the summer months. Stagnant water provides the perfect breeding ground, and experts warn the problem is likely to worsen as temperatures rise.

The details

Mosquitoes rely on standing water to breed, with larvae developing in just five to seven days. Ideal conditions include temperatures above 50 degrees, high humidity and, for some species, the presence of organic material in the water. Common breeding sites include birdbaths, gutters, containers and tires. Pest control inspectors have warned residents to empty or drain any stagnant water weekly to help break the mosquito breeding cycle.

  • In the last two weeks of February 2026, Southern California experienced significant temperature fluctuations, shifting from cooler, active weather to intense, summer-like heat.
  • Mosquito populations are currently five times higher than the five-year average for this time of year.

The players

Brian Brannon

An inspector with the Orange County Vector Control.

Danny Bui

Another inspector with the Orange County Vector Control.

Got photos? Submit your photos here. ›

What they’re saying

“We are seeing five times as many mosquitoes at this time of year compared to the five-year average. There's a lot of mosquito breeding going on right now.”

— Brian Brannon, Inspector, Orange County Vector Control (CBS News)

“A bottle cap of water can breed up to 100 mosquitoes.”

— Danny Bui, Inspector, Orange County Vector Control (CBS News)

What’s next

Pest control inspectors have warned residents to empty or drain any stagnant water weekly to help break the mosquito breeding cycle.

The takeaway

The combination of heavy rains and rising temperatures in Southern California has created ideal conditions for a mosquito population boom, posing a significant public health concern as the summer months approach. Residents must be proactive in eliminating standing water sources to help curb the exponential growth of these pests.