Autumn management does not begin when the first leaves fall or when horses suddenly need winter rugs. It begins much earlier, often while September still feels remarkably like summer.
Warm afternoons can make it easy to believe that little has changed. The horses are still outside, the fields may still look green and winter can seem a long way away. Yet the environment around them is already shifting. The nights become cooler, the days become shorter and grass growth gradually slows, even when the pasture still looks reasonably green from a distance.
At Maverick Stables, this is the period in which we start looking more closely at changes that can easily go unnoticed at first. We are not waiting for the season to fully turn before adjusting our management, because autumn is rarely defined by one major change. Instead, it is a gradual transition in which pasture availability decreases, horses begin grazing closer to the soil, seeds and acorns start falling, hay becomes increasingly important and turnout gradually moves from summer pasture towards winter paddocks.
That transition is exactly why autumn deserves attention. A horse that spent summer grazing on a well-covered field may only weeks later be spending considerably more time on a paddock where the surface, feeding method and forage availability are completely different. Good management is therefore not simply about changing from grass to hay or deciding when to use a rug. It is about making sure the whole transition remains safe, gradual and appropriate for the individual horse.
A pasture can remain green while providing considerably less forage than it did earlier in the year. As temperatures fall and daylight decreases, grass growth slows, while horses continue grazing. Gradually they begin taking the pasture shorter and shorter, often long before the field appears visually exhausted.
That changes the way horses use the field. On abundant summer pasture, they can move around selectively, choosing the plants and grazing areas they prefer. When grass becomes shorter, that choice decreases. Horses begin searching between the remaining plants, grazing much closer to soil level and spending more time in places they may largely have ignored during summer.
This is why we do not assess pasture simply by whether it still looks green. We look at the density and height of the grass, the number of horses using the field and, importantly, how they are behaving while grazing. Pasture-management guidance likewise recommends removing horses before cool-season grasses are grazed excessively short rather than waiting until the field has been completely depleted.
Once horses start working harder to find every remaining mouthful, the environment around them becomes increasingly relevant. Fallen leaves, acorns, seeds and exposed soil are more likely to become part of what they investigate or accidentally consume. Providing supplementary forage before the pasture is completely bare therefore does more than replace missing grass: it gives horses an appropriate alternative before they have reason to search extensively at ground level.
Trees that provided shade throughout summer can become a very different consideration when autumn arrives. Oak trees begin dropping acorns, sycamores release their characteristic winged seeds and wind distributes plant material far beyond the area directly underneath the tree.
Oak trees are a good example of why context matters. The presence of an oak around a horse pasture does not automatically mean that poisoning will occur, nor should the accidental consumption of an isolated acorn be confused with significant oak toxicosis. Veterinary descriptions of oak poisoning involve substantial exposure and can include severe gastrointestinal damage as well as renal involvement.
From a management perspective, we are therefore especially interested in the combination of large quantities of fallen material and decreasing forage availability. A horse grazing plentiful grass has much more choice than one searching an increasingly short field underneath trees. As the season progresses, we consequently keep a closer eye on where horses choose to graze, how much material is accumulating underneath surrounding trees and whether additional forage or a change in turnout area is appropriate.
Sycamore is a separate and considerably more acute autumn concern. Seeds, leaves and seedlings of the European sycamore maple (Acer pseudoplatanus) can contain hypoglycin A, the toxin associated with atypical myopathy. The Royal Veterinary College describes atypical myopathy as a severe and often fatal muscle disorder, with cases particularly associated with horses ingesting fallen sycamore seeds during autumn and winter and seedlings during spring.
The toxin interferes with normal energy production in muscle cells. Affected horses can develop profound weakness, muscle trembling, difficulty walking or standing, a low head carriage, breathing difficulties and dark red or brown urine. Some horses initially show signs that can resemble colic, but the condition can progress rapidly and requires urgent veterinary attention.
One of the most important practical points is that the sycamore does not necessarily have to stand inside the paddock. The RVC advises checking neighbouring areas because the winged seeds can travel considerable distances, while BEVA specifically highlights sparse pasture as a situation in which horses may inadvertently consume seeds while searching for forage.
For us, autumn pasture inspection is therefore not something we complete once at the beginning of the season. Conditions can change after strong wind or storms, and a paddock that appeared clear several days earlier may look very different afterwards.
The connection between sparse pasture, fallen material and soil comes back to one of the simplest principles in horse management: horses continue wanting to forage even when the field provides less suitable forage.
If turnout hours remain similar while grass availability decreases, the horse begins searching more intensively for whatever remains. This can mean grazing extremely close to the ground, eating between fallen leaves and seeds or repeatedly searching areas where the grass has already disappeared.
We therefore prefer to introduce additional forage before horses reach that point. Hay increasingly takes over the role of pasture while some grass is still available, rather than suddenly becoming the sole forage source once the field has already been exhausted.
This gives the horse a clear alternative and allows the seasonal feeding transition to happen gradually. It also means that when summer pasture eventually gives way to paddock turnout, hay is no longer a completely new part of the horse’s daily routine.
One of the most important autumn transitions is not simply grass to hay, but pasture to paddock.
During summer, horses spend much of the day obtaining forage from a vegetated surface. Once they move onto winter paddocks or dry lots, they become increasingly dependent on the forage we provide. At that point, the condition of the ground underneath the hay becomes much more important.
This is particularly relevant where the paddock surface contains sand or exposed soil. Horses are extremely efficient at collecting the final pieces of forage after the larger quantities have been eaten. If hay is placed directly onto a sandy surface, they can repeatedly pick up small amounts of sand together with those last stems.
The problem is therefore not necessarily one obvious mouthful of sand. It is the possibility of repeated ingestion over time.
Merck describes sand enteropathy particularly in horses or foals that are kept or fed in sandy paddocks, stalls or pastures. When sufficient sand accumulates in the large intestine, horses can develop diarrhoea, weight loss, abdominal discomfort or colic.
For that reason, the move from summer grass to winter paddocks changes more than where our horses spend the day. It changes how they eat, which makes the feeding surface itself part of our autumn management.
Once horses spend more time on paddocks, we pay particular attention to the areas where hay is offered. Where necessary, we use feeding locations or systems that limit direct contact between forage and bare sandy ground, rather than assuming that providing enough hay is by itself sufficient.
This becomes increasingly important as autumn progresses. Frequently used areas around feeders, gateways and water points can change quickly once rainfall increases and horses spend more time on smaller winter turnout areas. A surface that appeared suitable at the beginning of the season may become bare, disturbed or muddy several weeks later.
Providing sufficient forage remains important as well. A horse with adequate forage available has far less reason to spend long periods searching through the paddock surface for tiny leftover pieces. But forage quantity and feeding location need to be considered together: providing hay while allowing the horse to sift the final mouthfuls directly out of sand does not completely solve the problem.
Sand accumulation should also not be reduced to a home test or supplement. When clinical signs suggest that significant accumulation may be present, diagnosis and treatment belong with the veterinarian. Merck notes that veterinary assessment may involve history, faecal findings, abdominal auscultation and, where available, abdominal radiography.
While turnout gradually moves towards paddocks, the ration itself is changing at the same time. Fresh grass and hay may both be forage, but they differ in moisture, nutrient profile and physical characteristics, and the microbial population within the horse’s hindgut needs time to adapt when feed changes.
University of Minnesota equine nutrition guidance recommends introducing changes gradually, explaining that horses rely on hindgut microorganisms to process forage and that sudden dietary changes do not give those microbial populations sufficient time to adjust. Their general guidance is to replace only part of the existing feed at a time and complete the change over a week or longer.
In practice, the seasonal transition can make this quite natural. We begin offering hay while grass is still available. Initially horses may show considerably more interest in the grass, but as pasture growth slows they naturally begin consuming a larger proportion of hay. By the time winter paddock management becomes dominant, the conserved forage that will form the basis of their winter ration is already familiar.
This also gives us time to watch how the individual horse responds. Appetite, manure consistency, body condition and drinking behaviour can all be monitored throughout the transition rather than only after the diet has changed completely.
Fresh pasture provides a substantial amount of moisture. University of Minnesota notes that lush summer grass may contain around 60–80% moisture, while dried winter feeds such as hay generally contain less than 15%. As hay gradually replaces pasture, the horse therefore needs to compensate for considerably less water coming through its forage.
At the same time, cooler autumn weather can mean that some horses drink less readily than they did during warmer months. This is why we monitor more than simply whether a trough or drinker contains water. We also pay attention to the horse’s actual drinking behaviour and to changes in manure consistency.
If droppings become noticeably drier or firmer than usual, that is a reason for us to look more closely at hydration, forage and the complete ration. Maintaining adequate water intake helps maintain faecal moisture, while prolonged insufficient water consumption can increase the risk of intestinal impaction. University of Minnesota specifically warns that overly dry intestinal contents can progress towards blockage over time.
For selected horses, we may also use soaked mash as part of the ration when we want to introduce additional moisture through feed. We regard this as supportive management rather than a replacement for drinking: clean water must remain freely available, and the reason behind unusually dry manure or reduced water consumption still deserves attention.
This becomes particularly relevant during the move from grass-rich pasture towards hay-based paddock management because several changes can occur together: less moisture from forage, different drinking behaviour and more dry matter entering the digestive tract. Watching those changes early gives us an opportunity to adjust management before they become a larger digestive problem.
Less grass does not automatically mean nutritionally insignificant grass.
Cool-season grasses can continue to contain meaningful concentrations of non-structural carbohydrates, and autumn conditions can alter those levels considerably. University of Minnesota notes that freezing can interrupt plant respiration and leave sugars within the plant, while grasses can gradually accumulate sugars during autumn, particularly in lower stems and leaf bases.
This is especially relevant for horses with insulin dysregulation, obesity, equine metabolic syndrome or a history of pasture-associated laminitis. For these horses, the fact that a field looks short or has stopped growing quickly does not automatically mean unrestricted grazing becomes appropriate.
Autumn pasture management can therefore appear contradictory. A field may no longer provide enough forage to meet a horse’s needs while the grass that remains can still be nutritionally significant for a metabolically sensitive individual.
That is why we consider the horse, the pasture and the entire ration together, rather than using the appearance of the field as the only guide.
Long before winter truly arrives, decreasing daylight has already begun influencing the horse’s coat. This can create a peculiar transitional period in which horses are developing considerably more insulation while daytime temperatures are still surprisingly high.
At the same time, their diet is moving away from fresh grass and increasingly towards stored forage. Our starting point throughout this period remains the complete ration: suitable forage, sufficient water, appropriate minerals and vitamins, correct body condition and nutrition matched to age, growth, reproductive status or workload.
For selected horses, we also use Excellent Vitasporal Horse during periods such as coat change when we feel some additional nutritional support is appropriate. Excellent Horse describes Vitasporal as a complementary feed containing vegetable oils, vitamins A, D and E and beta-carotene, and specifically lists shedding, growing young horses, pregnant or lactating mares and older horses among its suggested uses.
For us, this remains exactly that: an addition to the broader ration. It does not compensate for unsuitable forage, incorrect body condition or an underlying health problem. The horse itself remains the most important source of information.
As the nights become colder, rugging inevitably becomes part of the seasonal discussion. Yet there is no single temperature at which every horse suddenly requires the same rug.
Body condition, coat, age, clipping, health, activity, forage availability, shelter, wind and rain all influence how a horse experiences its environment. World Horse Welfare therefore recommends considering these factors individually rather than rugging according to human comfort or temperature alone.
This is particularly important during early autumn because conditions can vary enormously within one day. A cold morning may be followed by a warm afternoon, while persistent wind and rain can make another day feel far colder despite a similar air temperature.
A young horse with a natural winter coat, plenty of forage, shelter and freedom to move therefore cannot automatically be managed in the same way as a clipped horse in regular sport.
For us, the useful question is not simply “How cold is it?” but rather “What conditions will this particular horse experience throughout the day?”
For horses that do need an outdoor rug during changeable autumn conditions, one of the products we use is the Winderen Thermoactive Zoom 50–200 turnout rug.
The concept is particularly relevant to transitional weather because the manufacturer uses Outlast® technology within the rug. Winderen describes the material as responding to changes in the horse’s skin temperature by absorbing excess heat as temperature rises and releasing stored heat as temperature falls, effectively functioning as a thermal buffer. The turnout construction also uses 1680D Ballistic Nylon and a breathable waterproof polyurethane coating with a stated 10,000 mm waterproof rating. Winderen
Those characteristics are useful within our routine when morning, afternoon and evening can present very different conditions, but no technical rug removes the need to observe the horse wearing it.
We still physically check underneath the rug, assess whether the horse is dry and comfortable and reconsider the choice when weather, coat, workload or turnout conditions change. Regularly removing or adjusting rugs so the horse itself can be checked and warns against over-rugging.
A rug remains one management tool. It does not replace the person making the management decision.
Within our rearing groups, seasonal changes are often easy to see because young horses spend considerable time outdoors and move continuously within their social groups. Several youngsters grazing together can change a field surprisingly quickly, which means that pasture availability can decline faster than it appears when viewed from a distance.
This is why we repeatedly reassess the way they are using the field. When youngsters begin grazing extremely short, spending more time underneath trees or repeatedly searching bare patches, the pasture is already telling us that the management needs to change.
Later, when those groups spend more time on paddocks, our attention moves with them. Hay quantity becomes important, but so does the surface from which they eat. We do not want young horses spending hours picking the final pieces of forage out of sandy ground simply because they are determined to continue foraging.
Their body condition, growth, coat development, social behaviour, forage availability and the condition of the paddock therefore form part of the same assessment.
For us, that is part of horse-first development: allowing young horses to live naturally and socially while adapting their environment when the season changes what that environment can provide.
The most important element running through all of these subjects is timing. We do not want to recognise that a pasture has become too short only once horses are already searching for food beneath the trees, nor do we want to introduce hay only after the grass has completely disappeared. Likewise, paddock feeding deserves attention from the moment horses begin spending more time on bare surfaces rather than only after sand ingestion has become a veterinary concern.
The same principle applies to hydration. As pasture contributes less moisture and hay contributes more dry matter, we monitor water intake and manure consistency and use additional moisture through soaked mash where appropriate. During coat change, we reassess whether the ration continues to suit the individual horse, and once the weather becomes more variable, rugging is adjusted according to the horse rather than the calendar.
Autumn management is therefore not one major switch from a summer programme to a winter programme. It is a gradual sequence in which pasture, paddock conditions, forage, water, coat and weather all change at slightly different speeds.
Managing those changes early means that the horse’s digestive system, daily routine and environment do not all have to adapt overnight.
That is ultimately what we want from preventive management at Maverick Stables: small, informed adjustments made early enough that the transition remains uneventful.
Good management can reduce risk, but it cannot eliminate every health problem. Changes in appetite, drinking behaviour, manure consistency, body condition, movement or general behaviour should always be considered in context, especially during a period in which turnout and feeding conditions are changing simultaneously.
If you suspect significant ingestion of sycamore material, contact your veterinarian urgently. Marked weakness, muscle trembling, difficulty walking or standing and dark red or brown urine can be associated with atypical myopathy, which can progress rapidly.
Persistent diarrhoea, repeated mild colic signs, unexplained weight loss or recurrent abdominal discomfort in a horse living or feeding on sandy ground also deserve veterinary investigation, particularly where sand accumulation is possible.
Likewise, a horse producing progressively less or unusually dry manure, showing a clear reduction in appetite or developing colic signs during the transition towards a predominantly hay-based ration should not simply be managed by adding mash and waiting. Hydration and feeding management can be reviewed, but suspected impaction or other gastrointestinal disease requires appropriate veterinary assessment.
At Maverick Stables, veterinary questions and health concerns are discussed with our veterinary professionals at Paardenkliniek Emmeloord where appropriate.
For readers who would like to explore the veterinary and nutritional background behind the subjects discussed in this article, these are the resources:
Royal Veterinary College — Atypical Myopathy Fact File
A detailed veterinary resource on sycamore-associated atypical myopathy, hypoglycin A, clinical signs, risk factors and preventive pasture management.
Royal Veterinary College – Atypical Myopathy Fact File
British Equine Veterinary Association — Sycamore and Atypical Myopathy
Veterinary guidance on sycamore seeds and seedlings, sparse pasture and the importance of maintaining suitable forage availability.
BEVA – Sycamore and Atypical Myopathy
Merck Veterinary Manual — Oak Toxicosis in Animals
Veterinary information on oak and acorn poisoning, including gastrointestinal and renal effects.
Merck Veterinary Manual – Oak Toxicosis
Merck Veterinary Manual — Sand Enteropathy in Horses
Information on sand ingestion, intestinal accumulation, diarrhoea, weight loss, colic, diagnosis and treatment.
Merck Veterinary Manual – Sand Enteropathy in Horses
University of Minnesota Extension — Caring for Your Horse in the Winter
Useful information on the difference in moisture content between pasture and hay, winter water intake, faecal moisture and the relationship between inadequate hydration and impaction colic.
University of Minnesota – Caring for Your Horse in the Winter
University of Minnesota Extension — Ten Things You Should Know About Feeding the Mature Horse
Guidance on making gradual dietary changes and allowing the hindgut microbial population time to adapt when changing hay or feed.
University of Minnesota – Feeding the Mature Horse
University of Minnesota Extension — Horse Pasture Drought and Frost Concerns
Information on autumn and frost-related changes in pasture sugars and nutritional value.
University of Minnesota – Horse Pasture Drought and Frost Concerns
University of Minnesota Extension — Managing Forage Carbohydrate Content
Background on sugars, fructans and non-structural carbohydrates in horse forage and why this matters particularly for metabolically sensitive horses.
University of Minnesota – Managing Forage Carbohydrate Content
World Horse Welfare — Rugging Horses: When Does Your Horse Need a Rug?
Current guidance on rugging according to the individual horse, taking body condition, coat, clipping, weather, forage, shelter and activity into consideration.
World Horse Welfare – Rugging Horses
Excellent Horse — Vitasporal
Manufacturer information on Excellent Vitasporal Horse, including its composition and suggested use during shedding and for young horses, broodmares and other horses requiring additional nutritional support.
Excellent Horse – Vitasporal
Winderen — Thermoactive Zoom 50–200 Turnout Rug
Manufacturer information on Outlast® technology, Ballistic Nylon 1680D and the waterproof and breathable construction of the transitional turnout rug used within our management.
Winderen – Thermoactive Zoom 50–200
This article reflects our own autumn management approach at Maverick Stables and is intended for general educational purposes. Every horse, pasture, paddock, ration and management system is different, and management should always be adapted to the individual horse and local circumstances.
Products mentioned in this article, including Excellent Vitasporal Horse and the Winderen Thermoactive Zoom 50–200 turnout rug, are products we use within our own management. Their inclusion does not replace an appropriately balanced ration, suitable forage, unrestricted access to clean water, veterinary diagnosis or professional nutritional advice.
If you suspect atypical myopathy, significant ingestion of acorns or other potentially toxic plant material, sand accumulation, colic, laminitis or another change in your horse’s health, contact your veterinarian.
