Chicken Tractor Size & Pasture Rotation Calculator

What is a Chicken Tractor?

A chicken tractor is a bottomless, mobile coop and run that is moved daily across lawn or pasture. Pioneered by regenerative farmers like Joel Salatin, chicken tractors allow birds to forage continuously for fresh greens, seeds, and insects while leaving concentrated manure behind to fertilize the soil.

Unlike stationary coops that quickly turn yards into bare dirt and mud, a properly managed chicken tractor keeps birds on clean, pathogen-free ground every 24 hours.

Space Allowances: Meat Broilers vs Laying Hens

Space requirements in a mobile tractor differ significantly depending on the poultry class:

• Broilers / Meat Birds (1.5 sq ft per bird): Fast-growing meat birds (such as Cornish Cross or Freedom Rangers) are less active and spend their days resting and grazing. A standard 10×12 ft (120 sq ft) Salatin tractor easily houses 75–80 broilers when moved daily.
• Laying Hens (3.5–4.0 sq ft per hen): Active layers require additional vertical headroom, internal roost perches, and enclosed nesting boxes. Allow at least 3.5 sq ft of floor footprint per hen.

The Power of the Pasture Rest Cycle

The secret to regenerative poultry management is rest. Moving chickens off a paddock allows the grass root systems to absorb the high-nitrogen droppings without suffering crown damage.

In the rapid spring flush, pasture regrows in 21 days. In the hot summer months, allow 35 days or more before running the tractor over the same section of grass. This breaks the reproductive life cycle of internal parasites (coccidia, roundworms) and ensures the flock always steps onto lush, clean greens.

Frequently asked questions

How much space do chickens need in a mobile chicken tractor?

For pastured broiler chickens (meat birds like Cornish Cross or Freedom Rangers) moved once or twice daily, ATTRA extension guidelines recommend a minimum of 1.5 sq ft of floor space per bird. For pastured laying hens with mobile shelter and daytime pasture foraging, allow at least 3.5 to 4 sq ft of tractor floor space per hen.

Why must a chicken tractor be moved every single day?

Moving the tractor daily onto clean pasture accomplishes three critical goals: it provides fresh, untrampled green forage and insects; it prevents chickens from destroying the plant crowns and compacting the soil; and it breaks the life cycle of internal parasites (like coccidia and roundworms) by leaving droppings behind.

How many days of rest does pasture grass need before chickens return?

In the fast-growing spring flush, pasture needs approximately 21 days to fully regrow its nutrient-rich top growth. In the slower summer heat, pasture requires 35 days or more of rest. Moving poultry across rested paddocks maximizes forage intake and prevents bare dirt patches.

How much organic fertilizer do pastured chickens add to the soil?

An adult laying hen excretes approximately 1.2 lbs of total nitrogen per year (around 100 lbs of fresh high-nitrogen manure). In a rotating tractor system, this manure is distributed evenly across your lawn or pasture without burning the grass, eliminating the need for synthetic fertilizer.

What are the classic dimensions for a DIY chicken tractor?

The classic Joel Salatin-style broiler tractor is 10 ft wide × 12 ft long × 2 ft high (120 sq ft), holding 75–80 broilers. For smaller backyard flocks of 15–25 birds, an 8 ft × 10 ft (80 sq ft) or 6 ft × 10 ft (60 sq ft) tractor built from lightweight EMT conduit or cedar 2x2s is easy for one person to pull with a hand dolly.