Breed Guide

Cornish Cross

The breed behind virtually every chicken sold in US grocery stores. Cornish Cross hit slaughter weight (6+ lbs) in 6–8 weeks — incredible feed conversion. They're not pets and aren't designed to live long; cardiovascular problems set in around week 10.

📍 USA (1950s — commercial hybrid)⚖️ 6–10 lbs (slaughtered at 6–8 weeks)🥚 Not raised for eggs
By James · Updated May 2026
Cornish Cross chicken — mostly white, broad-breasted, short legs, often barely able to walk past 6 weeks

Cornish Cross at a glance

Eggs / year
Not raised for eggs
Egg color
tinted
Egg size
medium
Adult weight
6–10 lbs (slaughtered at 6–8 weeks)
Temperament
Lethargic — bred to eat and grow
Beginner-friendly
★★★☆☆
Cold tolerance
❄️ Fair
Heat tolerance
☀️ Poor
Broodiness
rarely
Noise level
quiet
Flight risk
low
Best for
meat

✓ Pros

  • Incredible feed-to-meat conversion
  • Ready to butcher in 6–8 weeks
  • Tender, mild meat
  • Easy to process at home

⚠ Watch out for

  • Not a long-lived breed — must be butchered
  • Heat-sensitive after week 4
  • Almost cannot free-range (legs give out)
  • Heart attacks common after 8 weeks

Appearance

Mostly white, broad-breasted, short legs, often barely able to walk past 6 weeks

Coop & care notes

Raised for meat, not laying. Use a chicken tractor (movable pen). Restrict feed at night to slow growth and reduce heart strain.

Coop calculator (pre-set for Cornish Cross)

Adjust flock count and climate — sizing math below uses heavy-class defaults for Cornish Cross birds.

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Housing method

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✓ Why people choose this
  • Most space-efficient per bird
  • Easy to clean (you walk in)
  • Strongest predator protection
  • Works in any climate
⚠ Tradeoffs
  • Run gets stripped of grass quickly
  • Birds don't access fresh forage
  • Largest construction project
  • Permanent — hard to relocate
Best for: Anyone with a fixed flock location and 50+ sqft to spare

Live 3D preview

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Showing: Walk-in coop with run  ·  Rectangle dimensions are suggestions — total sqft is what matters.

Your coop & run requirements

🏠Coop interior
24sqft
~4′ × 6′
🌿Run / outdoor
60sqft
~6′ × 10′
🥚Nesting boxes
2boxes
1 per 3–4 hens
🪵Roost length
5ft
60″ total
💨Ventilation
3sqft
above roost height
🌾Feed needed
39lbs/mo
layer feed
💧Water capacity
0.8gal/day
more in summer
For 6 standard birds:
  • Always use 1/2″ hardware cloth, never chicken wire, on all openings.
📐
Need to measure your yard first? Use satellitearea.com to draw your property on a satellite map and get the square footage — handy for picking where the 60 sqft run will fit.

Recommended supplies for your flock

Sized to your inputs above. Links open Amazon in a new tab.

Coop
PawHut 137″ Split-Level Coop (8–10 birds)
Sized for your 6-bird flock at 24 sqft. Most-reviewed mid-tier coop on Amazon — split-level with attached run.
View on Amazon →
Run
1/2″ Hardware Cloth (50+ ft rolls)
You need ~39 linear ft. Predator-proof — chicken wire will not stop a raccoon. Compare current 50-ft rolls.
View on Amazon →
Nesting
Best Nest Box — Reversible Rollout (Medium)
You need 2 boxes. The "gold standard" rollout — eggs roll out clean onto a pad, no pecking, no broken eggs.
View on Amazon →
Roosting
Heavy-duty roost-bar brackets (use with 2×4 lumber)
6 birds need ~5 ft of roost. A flat 2×4 wide-side-up keeps feet warm in winter; brackets mount it; lumber is cheap locally.
View on Amazon →
Feeding
Grandpa's Standard Treadle Feeder (20 lb)
Your flock eats ~39 lbs/mo. Grandpa's is the original NZ-made treadle — 20+ years on the market, the only one BYC moderators endorse.
View on Amazon →
Watering
RentACoop 2-Gallon Horizontal Nipple Waterer (4-port)
~0.8 gal/day. Horizontal nipples don't drip, work in cold weather, and the dribble dishes prevent waste.
View on Amazon →
Convenience
Run-Chicken T50 Automatic Coop Door
Ranked #1 in 2026 head-to-head tests — easiest install (under 20 min), AA batteries last 1+ year, anti-pinch motor.
View on Amazon →
Bedding
Large-flake kiln-dried pine shavings
For 24 sqft of coop floor. Tractor Supply's Producer's Pride bale is the cheapest option locally — Amazon's premium brands work too.
View on Amazon →
Health
Harris Diatomaceous Earth Food Grade (10.5 lb + duster)
OMRI-certified, includes a duster applicator. Use in dust baths and sprinkle in nesting boxes for mite/lice control.
View on Amazon →
Security
Spring-bolt latch + locking carabiner combo
Raccoons defeat any one-handed latch. The standard recipe is a spring bolt + secondary locking carabiner — two motions, two hands.
View on Amazon →
Security
316 Stainless Locking Carabiners (pair with bolt above)
Marine-grade stainless. Use as the secondary lock on every coop and run access point.
View on Amazon →
As an Amazon Associate this site earns from qualifying purchases. Recommendations are sized to your flock and based on standard backyard chicken-keeping practices.

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