Flies Everywhere in the Chicken Coop
Stable flies swarming a backyard coop through the warm months
The short answer
Where you hang the trap matters more than the trap itself. A sticky trap hung inside the coop concentrates flies where the birds live, while the same trap hung on the sunny line between the manure pile and the coop catches them on their way between the two. The Starbar EZ Trap holds 4.2 stars from 210 reviews at Chewy (November 2026). This page also names two other traps from the same brand to avoid: Fly Relief at 3.7 stars from 201 reviews and Trap 'N Toss at 3.9 from 501. Their records are why we leave them out, so you do not grab the cheaper Starbar box by mistake.
Why does this happen?
Stable flies breed in damp organic matter: wet manure, spilled feed soaked by a leaking drinker, soiled bedding that never dries. The adults tormenting the birds are only the visible part; the breeding site is where the next generation is coming from.
Flies travel back and forth. They move between the breeding site, sunny resting surfaces and the host animals along predictable lines, and they favor vertical surfaces warmed by the sun. An intercept trap on that line catches them in transit, away from the birds.
A trap at the coop does the opposite of its job. Traps and resting surfaces beside the flock pull flies from the whole neighborhood into the one place the birds cannot leave. Mistakes in where traps are placed, not trap quality, explain most one-star reviews in this group.
The fix, in order
The steps run in order, cheapest first. Stop at the step that works. The product comes last, and only where the free steps run out.
Free step
Dry out the breeding sites
Scrape wet manure, fix the drinker leak, spread dry bedding, and move the manure pile as far from the coop as the yard allows. Cleaning up is the extension service's first instruction for a reason. It cuts the next generation, not only today's adults.
Free step
Walk the intercept line
On a sunny morning, watch where flies gather between the manure, the compost and the coop: fence lines, posts, the sun side of a shed. That line, at head height, in the sun, is where traps do their work.
The product step
Hang the EZ Traps on the line
Hang two or three traps along the intercept line, away from the coop itself, and replace them as they fill. Count the catch every week. The strip also tells you how you are doing: a falling count means the controls are working.
The product for this step
Starbar EZ Trap Fly Trap
The evidence, in tiers
Tier 1 · The method
The method follows university extension guidance on fly management for small flocks and stables. Clean up first. Use traps to monitor flies and reduce their numbers along the lines they travel. Use the counts on the trap to judge whether control is working.
Tier 2 · This product
The Starbar EZ Trap holds 4.2 stars from 210 reviews at Chewy (November 2026). Its brand siblings are printed as exclusions with their own records at the same retailer: Fly Relief 3.7 stars from 201 reviews, Trap 'N Toss 3.9 stars from 501. We have not hung this trap for this guide, and no claim is made here that we have.
Sticky traps kill adults only. Eggs and larvae in wet manure are untouched. That is why the steps above start with cleaning up, and why a trap count that never falls tells you about the breeding site, not about the trap.
Tier 3 · What owners report
Owners who moved traps outward from the coop report calmer birds and strips that fill with the flies that used to be inside. Reviews written by owners who hung traps in the coop doorway describe clouds of flies at the coop. That is the placement mistake, described by the people who made it.
The alternatives, conceded where they win
| Option | What it is | The honest verdict |
|---|---|---|
| Starbar EZ Trap | Weatherproof sticky trap for intercept lines | The pick: built for outdoor hanging, sized for barns and coops, honest record. |
| Rescue disposable fly trap | Water activated bait bag | It draws flies powerfully and can catch more than a sticky strip near a heavy infestation, at the price of a strong odor. Hang it even farther from living spaces. It is an extra for bad weeks rather than the default. |
| Parasitic fly predators | Beneficial wasps released monthly | A genuine biological control that attacks the pupal stage the traps miss. It is a program that runs all season, with monthly releases. It is the strongest option for large amounts of manure, and more than most backyard coops need. |
| Starbar Fly Relief and Trap 'N Toss | The brand's other trap formats | Excluded on their own records at 3.7 and 3.9 stars. We name them here because they sit on the same shelf under the same brand, and they are the ones people naturally pick up by mistake. |
The honest price comparison
Count the strip weekly for the first month. If the catch is not falling by week three, the breeding site is winning and the next job is manure management, not more traps.
Where it falls short
The weaknesses below are taken from the product's own review record. They are printed here because the recommendation is.
- Glue collects dust, feathers and the occasional beneficial insect along with the flies.
- Strips fill fast at peak season; a full strip left hanging catches nothing.
- The trap does nothing for the eggs and larvae in wet bedding. If you skip the cleaning-up step, flies will keep coming all season.
- Wind blown strips can stick to posts, gloves and sleeves. Handle by the edges.
The product, in short
Starbar EZ Trap Fly Trap
Questions people ask next
Where exactly should the traps hang?
On the sunny line between the breeding site and the coop, at about head height, on posts or fence lines. Not in the coop, not over the run, and not beside the door you use daily.
Are sticky traps safe around the birds?
Hung outside the coop on the intercept line, the birds never reach them, which is the safety design. Never hang one where a hen can fly into it.
Do they survive rain?
The EZ Trap is built weatherproof for barn use. A strip eventually loads up with dust and water spots and loses its stickiness. Replacing strips regularly, not the weather alone, is the routine.
How often do I replace them?
When the surface is covered or the catch count stalls while flies remain active. At peak season that can be a week; in a controlled yard, a month.
Chewy listing records for the Starbar EZ Trap, Fly Relief and Trap 'N Toss (November 2026) · University extension guidance on stable fly management for small flocks
The Fix JournalCase 30Pets