Around Idaho
Conditions vary across the state. Choose your city below, then describe what’s happening around your home or business.
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Local fly information
Fly control in Idaho
Learn what to look for around your property, explore your city, and ask about an inspection or a quote.
Flies in Idaho: what to know
What to note
Where you see flies, how long it has been going on, and anything you’ve already tried are the most useful details to mention.
A useful next step
Ask about an inspection, what treatment would involve, and whether follow-up visits are included. You don’t need to identify the problem yourself before getting in touch.
Local research
Flies in Idaho: what the public record shows
Before you compare quotes, it helps to know which flies actually live in Idaho, when they are busiest, and what the state figures look like. Everything below links to the agency or university page it came from.
2,500,000 cattle and calves including 725,000 milk cows and 355,000 cattle on feed (Jan. 1, 2026)
Idaho dairy inventory driving fly pressure
Idaho has one of the largest dairy herds in the country, and confined dairy manure is the single biggest filth fly source in the Magic Valley.
USDA National Agricultural Statistics ServiceClutches of 100–150 eggs in decaying organic matter at about 60% relative humidity
House fly egg clutches and moisture requirement
Drying out a manure or bedding source below that moisture level stops the breeding.
Pacific Northwest Extension (Oregon State University, Washington State University, University of Idaho)Overwinters as larvae or pupae, with adults emerging once spring temperatures rise
House fly overwintering in the Pacific Northwest
Spring fly pressure in Idaho comes from last fall's manure, so winter cleanup pays off in May.
Pacific Northwest Extension (Oregon State University, Washington State University, University of Idaho)Fly species recorded in Idaho
- House fly (Musca domestica) — Non-biting; breeds in manure, garbage, lawn clippings, decaying produce. 45 days at 60°F to 7 days at 95°F. Carries bacteria and viruses causing diarrhea, cholera, food poisonin…
- Little house fly (Fannia canicularis) — Most numerous in cooler spring and fall; males swarm 5–6 ft above ground in protected areas; develops in animal waste and fermenting grass clippings.
- Stable fly (Stomoxys calcitrans) — Biting fly with bayonet-like proboscis; about 12 days egg to adult; peaks early summer.
- Flesh fly (Sarcophagidae) — Large gray flies with black stripes; carcasses in attics, chimneys, walls.
When flies are busiest in Idaho
Filth flies overwinter as larvae or pupae and emerge as spring temperatures rise, with peak pressure in summer near dairy and feedlot manure.
PNW 770, a joint Oregon State, Washington State, and University of Idaho publication, treats fly management as source removal first: locate the larval medium with light traps and drain covers before treating adults.
For context, nationally
- About 45 days at 60°F; 7 days at 95°F — House fly life cycle vs temperature. Texas A&M AgriLife Extension
- 75–150 per cluster; 350 to 900 in a lifetime — House fly eggs per female. University of New Hampshire Extension
Sources: USDA National Agricultural Statistics Service; Pacific Northwest Extension (Oregon State University, Washington State University, University of Idaho); Indoor Flies and Their Control; University of New Hampshire Extension; Flies (Home and Landscape). Figures are quoted as the source prints them. How we check our sources
Explore Idaho cities
Boise
Semi-Arid Continental · urban setting
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Caldwell
Semi-Arid Continental · suburban setting
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Coeur d'Alene
Humid Continental · suburban setting
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Idaho Falls
Semi-Arid Continental · suburban setting
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Lewiston
Semi-Arid Continental · suburban setting
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Meridian
Semi-Arid Continental · suburban setting
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Moscow
Warm Summer Continental · suburban setting
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Nampa
Semi-Arid Continental · suburban setting
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Pocatello
Semi-Arid Continental · suburban setting
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Post Falls
Humid Continental · suburban setting
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Rexburg
Warm Summer Continental · rural setting
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Twin Falls
Semi-Arid Continental · suburban setting
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Jerome
Semi-Arid Continental · rural setting
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