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Mosquitoes in Your Yard? Kill the Larvae First, Then Repel

Adult mosquitoes come from water you can find. Dump what you can, treat what you cannot with dunks, then repel the few that are left.

By Jamilur Rahman Updated November 5, 2026 · 8 min read

Time
30 min
Cost
Under $20
Difficulty
Easy
A backyard corner at dusk with a rain barrel, a plant saucer holding still water and a birdbath
In this guide
  1. Quick answer
  2. Free vs. permanent fix
  3. What you'll need
  4. Why it happens
  5. Try this first (free)
  6. When free fixes aren't enough
  7. Buy the fix
  8. Why are there so many mosquitoes in my yard? What attracts mosquitoes to your yard
  9. Mosquitoes in yard no standing water? Check these hidden spots
  10. How to repel mosquitoes in yard naturally, and what works best
  11. What to skip
  12. FAQ
  13. Related problems

Quick answer

How to stop mosquitoes in yard: kill the larvae first, then repel the adults. Mosquitoes breed in water that sits for a week, even a bottle cap of it. Dump every container you can find. Treat the water you cannot drain, like a rain barrel, with Bti mosquito dunks, which kill larvae before they can bite. Then use a fan and repellent for the few adults that remain.

Free fix vs. permanent fix

Free fix · 30 minutes, then a weekly walk-round

Dump standing water every week

  • Empty or flip anything that holds water
  • Scrub birdbaths and pet bowls each week
  • Clear clogged gutters and fill low spots
  • Run a fan on the patio and trim damp, dense plants

How long it lasts: As long as you keep up the weekly check. One missed bucket can restart the cycle.

Most readers choose Permanent fix
Mosquito dunks (illustration)
Illustration

Mosquito dunks for water you cannot drain

You cannot empty a rain barrel, a pond or a spot that stays wet. Dunks contain Bti, a bacterium that kills mosquito larvae when they eat it. It stops mosquitoes before they become biting adults, instead of chasing them afterward.

What to get: Mosquito dunks

How long it lasts: About 30 days per dunk in standing water, then replace it.

Check price on Amazon

As an Amazon Associate I earn from qualifying purchases.

What you'll need

  • Bucket or watering can

    To empty containers and refill the birdbath

    You have it

  • Stiff brush

    Scrubs eggs off birdbaths and pet bowls

    You have it

  • Outdoor fan

    A steady breeze makes it hard for mosquitoes to reach you

    You have it
  • Our pick
    Mosquito dunks (illustration)
    Illustration

    Mosquito dunks

    For rain barrels, ponds and low spots that hold water

    Check price
  • EPA-registered insect repellent (illustration)
    Illustration

    EPA-registered insect repellent

    For bites tonight, while the yard clears

    Check price
  • Portable patio mosquito repeller (illustration)
    Illustration

    Portable patio mosquito repeller

    For a deck or patio where you sit out

    Check price

Why it happens

1

Standing water you missed

Mosquitoes lay eggs in any water that sits for a week or two. Birdbaths, clogged gutters, plant saucers, buckets, tarps and toys are the usual culprits.

2

Water you cannot easily drain

Rain barrels, ponds, catch basins and low ground that stays soggy all breed mosquitoes unless you treat them.

3

Tall grass and dense shade

Adult mosquitoes rest in cool, damp, shaded spots during the day. Thick shrubs, ivy and long grass give them a place to hide.

4

Neighboring yards

Some common biting mosquitoes stay close to where they hatched, but others travel farther. A neighbor's neglected pool can feed your yard.

5

Still air at dusk

Peak biting time is dusk and dawn. In calm air, mosquitoes find you easily by the carbon dioxide you breathe out and your body heat.

Try this first (free)

Do these in order, starting with the simplest.

  1. Walk the yard and dump anything holding water

    Tool used: Bucket or watering can

    Empty buckets, toys, plant saucers, wheelbarrows and folds in tarps. Drill drain holes in containers you keep. Repeat every week, since eggs can become adults in about a week or two.

  2. Scrub birdbaths and pet bowls

    Tool used: Stiff brush

    Dump the water, scrub the sides to remove eggs and refill with fresh water once a week.

  3. Clear the gutters and fill low spots

    Clogged gutters and sagging downspout extensions hold water for days. Clear them, and fill low spots with soil or gravel so water drains.

  4. Treat water you cannot drain

    Tool used: Mosquito dunks

    Float a dunk in rain barrels, ponds and low areas that stay wet. One dunk treats up to about 100 square feet of surface for around 30 days. Break it up for a birdbath and follow the label.

    Mosquito dunks (illustration)
    Illustration

    Tool for this step

    Mosquito dunks · For rain barrels, ponds and low spots that hold water

    Check price on Amazon

  5. Cut back tall grass and thin dense shade

    Mow regularly and trim shrubs and ivy so adults have fewer cool, damp spots to rest in.

  6. Add a fan for evenings

    Tool used: Outdoor fan

    Put a strong fan on the patio so the breeze blows across where you sit. Mosquitoes are weak fliers and struggle to reach you in moving air.

When free fixes aren't enough

If you have emptied everything and there are still plenty of mosquitoes, you are missing a water source: a rain barrel, a gutter, a buried drain, a low spot, a covered tarp or a neighbor's pool. Dunks handle the water you cannot drain. They do not kill adults or stop ones flying in from elsewhere, so you still want repellent on your skin and a fan on the patio. If a yard stays swarming all summer, call your local mosquito control program or a licensed pest professional.

Buy the fix

Still stuck after the free fixes? These are the products we would look at.

Our picks compared
PickProductFixesWho it's forBuy
Best pick
Mosquito dunks (illustration)
Illustration
Mosquito dunks
mosquito larvae in water you cannot drain Anyone with a rain barrel, pond, birdbath or a low spot that holds water. Check price
Budget pick
EPA-registered insect repellent (illustration)
Illustration
EPA-registered insect repellent
bites while you sit out, even while mosquitoes are still around Anyone who needs protection tonight, before the yard clears. Check price
Upgrade pick
Portable patio mosquito repeller (illustration)
Illustration
Portable patio mosquito repeller
bites on a deck or patio where you spend your evenings Households that sit out on a deck or patio most evenings. Check price
Best pick
Mosquito dunks (illustration)
Illustration

Mosquito dunks

Fixes: mosquito larvae in water you cannot drain

Look for: Bti, listed as the active ingredient on the label; Labeled for outdoor standing water such as rain barrels and ponds; A pack big enough for a season, since each lasts about 30 days; A label that lists pets, birds and fish as safe when used as directed.

Who it's for
Anyone with a rain barrel, pond, birdbath or a low spot that holds water.
Honest downside
There is no standing water at all and the mosquitoes come from elsewhere. Fans and repellent will help more. Do not use dunks in a fish tank or drinking water.
Check price on Amazon
Budget pick
EPA-registered insect repellent (illustration)
Illustration

EPA-registered insect repellent

Fixes: bites while you sit out, even while mosquitoes are still around

Look for: DEET, picaridin, IR3535 or oil of lemon eucalyptus as the active ingredient; An EPA registration number on the label; A formula and strength that suits the age of the user.

Who it's for
Anyone who needs protection tonight, before the yard clears.
Honest downside
The user is a baby or young child. Follow the label, since some products are not for young children.
Check price on Amazon
Upgrade pick
Portable patio mosquito repeller (illustration)
Illustration

Portable patio mosquito repeller

Fixes: bites on a deck or patio where you spend your evenings

Look for: A coverage zone that fits your seating area; Refills that are easy to find; A weather-resistant body, for outdoor use only.

Who it's for
Households that sit out on a deck or patio most evenings.
Honest downside
You want to cover the whole yard, or the spot is windy. These cover a small zone and work best in calm air.
Check price on Amazon

As an Amazon Associate I earn from qualifying purchases. We don't show prices because they change, so use the button to see today's price.

How we picked: How we picked: this page is based on public health and extension service guidance on mosquito control, product labels for Bti dunks and repellents, and what owners report in reviews. We do not test products by hand.

Why are there so many mosquitoes in my yard? What attracts mosquitoes to your yard

Female mosquitoes need blood to make eggs and still water to lay them in. They are drawn to the carbon dioxide you breathe out, body heat and sweat. They gather in shade, tall grass and damp spots, and they bite most at dusk and dawn. A wet spell makes every container a nursery.

Mosquitoes in yard no standing water? Check these hidden spots

  • Gutters and downspout extensions that do not fully drain
  • Buried drains and catch basins
  • Saucers under potted plants and folds in tarps
  • Tree holes, stumps and bromeliads
  • Low ground that stays soggy after rain
  • The neighbor's yard, pool or pond

How to repel mosquitoes in yard naturally, and what works best

The best non-chemical tools are a fan, thinning damp shade and Bti dunks, which are a biological larvicide. For skin, an EPA-registered repellent with oil of lemon eucalyptus is a plant-based option. Citronella plants and candles have little proof behind them, so do not rely on them alone.

What to skip

Citronella candles, zappers and ultrasonic gadgets

Citronella candles help only a little, and only right beside the flame. Bug zappers kill few mosquitoes, and ultrasonic repellers are not backed by evidence. Spend the money on dunks and repellent instead.

Frequently asked questions

How to reduce mosquitoes in yard, and how to prevent mosquitoes in yard before summer?
Cut off breeding. Do a weekly walk-round to empty containers, clear gutters, and put dunks in water you cannot drain. Start in spring, before the first warm spell, and keep it up all season.
How to stop mosquitoes in backyard when the neighbors have standing water too?
Treat your own water first. Then mention it kindly to the neighbor. If a pool or pond is neglected, report it to your local mosquito control or health office. Use a fan and repellent for time outside.
How to keep mosquitoes away from yard gatherings, and how to keep mosquitoes out of yard seating areas?
Dump and treat water a few days before the event, trim damp plants near the seating and put fans on the patio. Add repellent for guests, and a patio repeller if you host often.
Why is there so many mosquitoes in my yard right now, and how to avoid mosquitoes in yard at dusk?
Wet spells and warm weather fill containers and speed up breeding. To avoid bites at dusk, wear long sleeves, use a repellent labeled for skin and sit in the breeze of a fan.
How to fix mosquito problem in yard, and what can I do about mosquitoes in my yard today?
Today: dump water, drop a dunk in anything that stays wet, turn on a fan and use repellent. This week: clear gutters, trim damp plants and fill low spots. Each month: replace the dunks.

As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure

Mosquito dunks (illustration)
Illustration

Our pick: Mosquito dunks

Check price