The short answer for a Welsh pony's ground
An adult Welsh pony needs roughly an acre of reasonable grazing as a working starting point, together with a smaller hard-standing or sacrifice area it can use when the main field needs a rest. Welsh ponies are compact and famously thrifty, but small stature does not shrink the need for movement, grazing time, and dry ground underfoot. A pony confined to a worn corner quickly faces mud, patchy forage, and restless behaviour, whereas a pony with a full turnout area can walk, graze, and settle into a natural daily rhythm.
Plan the acre as living space rather than a food bowl. A Welsh pony that gains weight easily may graze part of the field behind temporary fencing while the rest recovers, and strip grazing lets you ration grass without reducing the total room the pony can move in.
Shelter that suits a hardy Welsh pony
A three-sided field shelter with its back to the prevailing wind covers most of a Welsh pony's shelter needs, provided the floor stays dry and there is a bedded corner for lying down. If the pony is stabled, a loose box around ten feet square gives an adult Welsh pony room to turn, lie flat, and rise without catching a hip on the wall. Headroom matters too: the pony should be able to raise its head fully without nearing the roof beams.
Site the shelter on the highest, driest ground available rather than in the gateway hollow where water collects. A Welsh pony will ignore an expensive shelter that stands in a bog and instead crowd into a muddy corner, so drainage and a stone or hardcore apron at the entrance do more for welfare than extra square footage inside a badly placed building.
Sharing the field without wearing it out
Rotation is what makes an acre work for a Welsh pony across the seasons. Divide the grazing so one section rests while another is grazed, move the pony before the grass is scalped to the roots, and rest the sacrifice area's surface by harrowing and reseeding worn patches when the pony is elsewhere. In wet months the pony may live mostly on the dry lot with hay, and that is a legitimate use of the space rather than a failure of the plan.
Keep companions in the calculation. A second pony sharing the field does not double the wear evenly, because both animals favour the same sheltered corner and gateway, so shared turnout calls for more total ground and a wider, reinforced entrance area.
Signs the space is not enough
A Welsh pony short of space tells you through the field first: gateways churned to soup, grazing eaten into bare earth, and fence lines paced into tracks. Behaviour follows, with weaving at the gate, wood chewing on rails, and squabbles over the one dry lying spot. Hooves suffer in standing mud, and a pony that cannot get dry rest will lie less and tire more.
Enlarge or rest the ground when those signs appear rather than waiting for the field to recover on its own, because a rested month early is far cheaper in forage than a ruined season. When several family members share turnout, feeding, and shelter checks for the pony, KinsLe and its Family Sharing keep the rotation plan and daily notes in one shared place.