Why We’re Still Seeing Mosquitoes in Southern California in November
- Nov 13
- 3 min read
It’s November in Southern California. The air’s a little cooler, the days are shorter, and most people assume mosquito season is over. But then you step outside, and there it is—that familiar high-pitched buzz that makes you slap at the air. So why are mosquitoes still around this late in the year?
Let’s talk about the typical mosquito season, why they’re still active right now, and what’s keeping them alive longer than you’d expect.
When Mosquito Season Usually Ends
In most parts of the country, mosquito season runs from late spring through early fall. Once the temperature drops below about 50°F, mosquitoes usually slow down and die off—or go dormant until spring.
But here in Southern California, things are different. Our mild winters and warm fall days mean mosquitoes can stay active months longer than usual. Some years, you might still see them buzzing around well into December.
Why Mosquitoes Are Still Around in November
There are a few reasons mosquitoes are sticking around longer this year:
Warm Temperatures
November temperatures in Southern California often stay in the 70s during the day. That’s perfect weather for mosquitoes. They only start slowing down when it consistently drops into the low 50s.
Standing Water
Even small puddles, planters, pet bowls, and clogged gutters can hold enough water for mosquitoes to breed. One female can lay hundreds of eggs in less than an inch of water. After light rain or overwatering the yard, that’s all they need to keep multiplying.
Moisture and Humidity
Early winter rains and leftover irrigation create humidity pockets where mosquitoes thrive. The combination of moisture and mild temperatures gives them everything they need to stay active.
Sheltered Areas
Mosquitoes hide in garages, sheds, patios, and under decks to avoid the cold. These warm, protected areas let them survive between feedings.
What Mosquitoes Do During Winter Months
In colder states, mosquitoes go into diapause—a hibernation-like state where adults die off and eggs survive the winter.
In Southern California, that doesn’t happen as often because it never gets cold enough for long periods. Instead, mosquitoes simply slow down. They breed less often, but they don’t completely stop. You’ll see fewer of them, but they’re still out there.
And as long as there’s water, warmth, and people to bite, they’ll keep showing up.
Why It’s Important to Treat Mosquitoes Year-Round
Even in late fall, mosquitoes can:
Lay eggs that survive into next spring.
Spread diseases like West Nile Virus and Dengue.
Bite and breed indoors if they find an open window or damp area.
Skipping mosquito control in cooler months allows populations to rebuild faster in the spring. The mosquitoes you see now are laying eggs that will hatch as soon as temperatures rise again.
How to Keep Mosquitoes Away This Fall and Winter
A few simple steps go a long way toward keeping them away:
Dump standing water from buckets, planters, and birdbaths weekly.
Keep gutters clean and dry.
Trim overgrown bushes and lawns where moisture collects.
Use fans and citronella candles in outdoor sitting areas.
Schedule a professional mosquito control service to treat breeding sites around your yard.
Professional Mosquito Control in Rialto and Fontana
At TruPest Solutions, we know mosquitoes in Southern California don’t follow the calendar. Our team uses targeted mosquito treatments designed for local conditions—focusing on breeding spots, moisture areas, and hidden shelters where mosquitoes survive the winter.
Our mosquito fogger treatments give fast results by creating a fine mist that spreads through your yard, shrubs, and shaded areas — reaching mosquitoes where they hide and breed. It’s one of the most effective ways to knock down active mosquitoes immediately and protect your property for weeks.
If you’re still getting bit in November, you’re not imagining it. Let’s take care of the problem before spring hits and they come back in full force.
Call 951-334-5288 or visit TruPestSolutions.com to schedule your mosquito service in Rialto or Fontana today.
