Housing

Chicken Tractors: Space per Hen, Moving Schedule, Predators and Weather

Field guide · Updated November 11, 2026 · about 9 min read

A chicken tractor is a floorless pen, often with a small house or nest box attached, that you move across grass or garden beds so hens reach fresh ground while staying enclosed. Oregon State Extension's Pastured Poultry 101 describes tractors as mainly small-scale, used in gardens for fertility, weed and pest control and tillage, and moved daily on fallow beds. Below: what extension services and ATTRA say on space, moving, ground recovery, predators, weather and weight.

Short version: about 4 square feet per bird (University of Guam), well under the 8 to 10 square feet Oregon State gives hens with no outdoor access; move it before the ground turns bare or muddy (University of Maine); solid roof, east and west shade, ½-inch or ¼-inch hardware cloth, hens locked in at night; and room to rotate over eight footprints.

Tractor, fixed coop or something bigger

"Mobile coop" covers systems that differ mainly in size and how often they move:

Space per hen: moving is not extra room

Guam Extension plans about 4 square feet per bird and calls six to eight hens a typical residential flock and sizes eight hens, which it says would lay five to six eggs a day, at 32 square feet: a 4 × 8 ft tractor. Oregon State's 4 × 10 ft garden tractor for 10 layers comes to the same 4 square feet each (our arithmetic). Penn State's 1.5 square feet per bird for pasture pens is a figure for broilers, which ATTRA's Robert Plamondon notes are slaughtered at 6 to 10 weeks. For laying hens that range outdoors by day, Plamondon gives 2 square feet per hen in houses holding feed and nests.

A floorless tractor with no run attached is all the space its hens get, and 4 square feet is well below the 8 to 10 square feet Oregon State gives for birds with no outdoor access. Moving the pen adds fresh ground, not room. Oregon State notes that a tractor can have a mobile house or small runs attached; otherwise keep fewer hens or build bigger. Side by side (our arithmetic):

For a fixed coop and run, use the coop space calculator.

How often to move it

The sources tie the schedule to the ground, not the calendar:

• Before the ground goes bare. Maine Extension's gapeworm bulletin says to move a tractor frequently enough that birds are never on bare or muddy ground; the same bulletin names contaminated soil and earthworms as sources of gapeworms (see worms in backyard chickens).
• Daily as a default. Oregon State moves garden tractors daily. Missouri's G741 moves its laying-hen tractor daily "for optimal pasture management," sometimes twice, and budgets 1.0 hour of moving a week for a 60-hen model.
• When half the forage is gone. Penn State's pastured-broiler guide (Knight and Shoop) moves pens every 2 to 3 days when birds first go out, then daily, and twice a day by weeks 7 to 8, and says to move once forage use reaches 50%, because grazing more cuts root structure and pasture health.
• By clearing rate. Guam says one chicken clears about 3 to 4 square feet every two weeks.

Ground and grass recovery

Guam's fact sheet gives the clearest backyard numbers: keep the tractor under one-eighth of the area it rotates over (256 square feet for a 32-square-foot tractor), mulch each vacated plot with green waste, and expect the soil to be ready for planting about two weeks after the hens move on, with weeds relatively controlled for two to four months.

Density matters as much as timing. Plamondon reports that a flock at 600 birds per acre destroyed the pasture in a few weeks, while at about 100 birds per acre damage stopped except near houses and feeders. If moving is not possible, Guam's alternative is a bottomless deep-litter pen: add fresh dry litter every few days and remove and compost it every month or two; see coop bedding and litter.

Predators: where tractors are weak

Penn State says the tractor protects birds from predators. The sources disagree on whether that is enough: Oregon State calls movable field pens predator-proof with no fencing needed, while the Extension Poultry predator page says floorless pens moved around on pasture may not be enough in some cases and extra perimeter fencing may be needed. Penn State suggests electric net fencing around the tractor field where predators burrow under, reach through or tear the wire.

• Mesh. Plamondon had raccoons reach through 1-inch wire and recommends ½-inch or ¼-inch hardware cloth.
• The bottom edge. Fixed runs get hardware cloth buried at least 12 inches (Extension Poultry) or wire buried 1 to 2 feet (Virginia Cooperative Extension); a pen moved daily cannot, hence flaps and electric netting. Plamondon adds that pens on skids are less predator-proof than pens with all four walls on the ground.
• Nights. Virginia Extension notes that most predation happens at night, and Extension Poultry advises having the flock roost in a secured location with all doors closed and locked.
• From above. Oregon State says day-range netting does not deter flying predators; a covered tractor does.

Telling which predator struck is covered in chicken predator ID by sign.

Weather, shade and heat

Penn State says the tractor shades birds, keeps them dry and breaks the wind. Guam wants shade available at all times, including on the east and west sides, and SARE's Profitable Poultry shows a tractor with an adjustable tarp for protection from rain and hot sun. Plamondon warns that after brooding "heat is far more dangerous than cold," so waterers belong in the shade; see heat stress.

Wind is the other risk. Plamondon found low, heavy houses the most windproof and shed roofs the worst, and suggests staking at least one corner. For winter, Missouri says layers can live in tractors year-round if the tractor can be moved to a sheltered spot with electricity for heating; Oregon State calls field pens seasonal, with minimal weather protection. Cold-weather steps are in winter care.

Weight, wheels and skids

Missouri says a well-designed tractor is lightweight and portable. How the builds compare:

Laying hens in a tractor: nests, roosts and homing

Missouri says laying-hen tractors should include roosting bars and nest boxes. Guam builds nests from buckets, jugs or wooden boxes lined with shredded paper, grass clippings or wood chips. For sizes, see nest boxes and roosts and perches. Plamondon advises short moves at first, early in the day, because after a long move hens may roost where the house used to be.

Move checklist

1. Move once about half the forage is eaten, or sooner if bare or muddy patches appear (Penn State; Maine).
2. Pick the next plot in the rotation, flat enough for the bottom edge to sit tight.
3. Move early in the day, in short hops while hens are new to it (Plamondon).
4. Check hanging feeders and waterers are clear of the ground (Penn State).
5. Lift the wheel or dolly end and pull slowly; field pens can crush chicks (Oregon State).
6. Close any gaps along the bottom edge and stake down a corner (Plamondon).
7. Reset east and west shade (Guam); keep water in the shade (Plamondon).
8. Mulch the old plot; plant it after about two weeks (Guam).
9. At dusk, lock every hen in (Extension Poultry).