Why Are Mosquitoes So Bad in Pasadena?

Why Are Mosquitoes So Bad in Pasadena & What To Do About It

If it seems like mosquitoes are worse in Pasadena than other areas of SoCal, you’re not hallucinating. While you love to live here, and enjoy the naturally pleasant weather… Here's another truth about Pasadena: we have the perfect combination of characteristics that make it a complete mosquito hotbed. Between the natural geography, local landscaping, and invasive species, this area never gets a mosquito break. 

In fact, San Gabriel Valley is one of the most challenging places in the region to maintain mosquito control. Meaning, trying to sit outside without any mosquito control could prove to be challenging (and accompanied by a surplus of buzzing and biting). So understanding why mosquitoes love it here just as much as you do is the first step in reducing mosquito populations. 

Your Yard’s Geography Works Against You

Sitting at the base of the San Gabriel Mountains, Pasadena creates the perfect conditions for mosquitoes. Those beautiful foothill canyons funnel moisture down into residential neighborhoods, while the city’s mature trees and dense landscaping trap humidity close to the ground. It’s so optimal for mosquito conditions, that it feels specifically designed for them to take over your outdoor areas. 

And to add, SoCal has year-round mild temperatures, which means there’s no cold season to thin out mosquito populations. They never fully tire or take a break. For canyon-adjacent properties, the mosquito pressure is even worse—natural water sources in those areas create a steady mosquito vacation home. And no amount of yard work will ever get rid of them. 

Irrigation Issues

Southern California yards are heavily watered, and irrigation creates standing water in more places than you realize. Excess water creates overspray that pools along fence lines, drip emitters that leave puddles, saucers under potted plants, low spots in lawns that stay damp for days. 

Now, this is a paradise for normal mosquitoes… but to the invasive day-biter, Aedes mosquitoes, this is a cakewalk. Aedes mosquitoes don’t need a pond to breed—they only need a bottle cap’s worth of water to start taking over. So, finding ways to reduce overspray and excess water (no matter how small) will help decrease all mosquito populations. 

Two Species, Two Threats

In SoCal, you have two mosquito species to worry about. They are Culex mosquitoes and Aedes mosquitoes. You might be thinking: Aren’t they the same? They buzz around and bother me, what’s the difference? Well, unfortunately, they have a key difference that ensures you have round-the-clock mosquito interruptions whenever you’re outside.

And when you think about the typical mosquito, you’re probably thinking of Culex mosquitoes—the ones that bother you only at dusk and dawn. While these are irritating (and carry diseases like West Nile), Aedes mosquitoes take it to the next level. They are aggressive day-time biters, which means between the two species, you never get a break from mosquitoes.

What Works the Best For Mosquito Control

Trimming dense vegetation, reducing standing water, and adjusting your irrigation schedule will help reduce populations, but it won’t fix it all. Because in Pasadena, do-it-yourself solutions only work to a point. That’s why Mosquito Squad of Pasadena exists—our professional mosquito treatment can reduce up to 90% of mosquito populations on your property for 21 days. 

And more importantly, because there’s no true off-season for SoCal, year-round treatment is recommended for steady protection. This means, you may have to call in some reinforcements to make sure you’re covered for mosquito season (so pretty much all year). 

Pasadena’s mosquito season doesn’t take a break, so why would we? Call Mosquito Squad of Pasadena at (213) 238-5564 or contact us online for a free quote.