Short answer
Not completely. Winter usually brings fewer bites, but invasive Aedes eggs can wait in dry containers and hatch when rain or sprinklers refill them.
Source, checked 2026-10-03: SGV: winter mosquitoes · SGV: winter scrub-down · CDPH: mosquito seasons (PDF)
Why the eggs outlast winter
These sources give different figures for how long Aedes eggs survive dry conditions:
LA West says eggs sit above the waterline, in containers holding as little as a teaspoon of water.
Source, checked 2026-10-03: LA West: Aedes eggs
SGV says summer and fall eggs can hatch after a winter storm or plant watering. When it's too cold or dry, they wait for warmth and standing water.
Source, checked 2026-10-03: SGV: winter mosquitoes · SGV: winter scrub-down
CDC says eggs can survive a winter in the southern United States; an Aedes egg takes 7–10 days to develop into an adult.
Source, checked 2026-10-03: CDC: Aedes life cycle
West Nile is mostly a summer and fall worry
CDPH says West Nile spreads most often in summer and early fall, when the Culex mosquitoes that carry it are most active. June–September is peak mosquito season in California; mosquitoes are still active in October.
Source, checked 2026-10-03: CDPH: mosquito seasons (PDF)
Your winter to-do list
Scrub, don't just dump. SGV says emptying water leaves eggs stuck to containers. Scrub the insides with soap, water and a brush or scouring pad.
Source, checked 2026-10-03: SGV: winter scrub-down
Tip water out weekly. Check containers after storms and sprinkler runs.
Source, checked 2026-10-03: SGV: winter mosquitoes
Scrub before storing or tossing. AV recommends a brush and warm, soapy water for containers left outside.
Source, checked 2026-10-03: AV: container cleanup
Wipe down surfaces that hold water. SGV includes this in its winter cleanup advice.
Source, checked 2026-10-03: SGV: winter mosquitoes
Still getting bitten?
Greater LA Vector Control monitors and controls mosquitoes in public spaces year-round.
Source, checked 2026-10-03: Greater LA: year-round work
Find your district by community · What's biting me? Take the quiz
Sources · checked 2026-10-03
- San Gabriel Valley Mosquito and Vector Control District — SGV: winter mosquitoes · checked 2026-10-03
- San Gabriel Valley Mosquito and Vector Control District — SGV: winter scrub-down · checked 2026-10-03
- Centers for Disease Control and Prevention — CDC: Aedes life cycle · checked 2026-10-03
- Los Angeles County West Vector Control District — LA West: Aedes eggs · checked 2026-10-03
- Antelope Valley Mosquito and Vector Control District — AV: container cleanup · checked 2026-10-03
- California Department of Public Health, West Nile Virus program — CDPH: mosquito seasons (PDF) · checked 2026-10-03
- Greater Los Angeles County Vector Control District — Greater LA: year-round work · checked 2026-10-03