Can Horses Eat Hay That Has Been Rained On?

Wondering if horses can eat hay that has been rained on? While it’s generally not ideal, horses can consume hay that has been exposed to rain, as long as it is still in good condition. The moisture from rain can lead to mold growth, which is harmful to horses. However, if the hay is properly dried and stored, horses can safely eat it without any issues. It’s crucial to regularly inspect the hay for signs of mold, as it can have detrimental effects on your equine companion’s health.

can horses eat hay that has been rained on

The Impact of Rain on Hay Nutrition: Can Horses Still Consume It?

Horses are herbivores that rely heavily on hay as a source of nutrition. However, when hay gets exposed to rain, it can undergo various changes that may affect its nutritional content and overall quality. In this section, we will explore the potential impact of rain on hay nutrition and whether horses can still consume it.

1.1. Absorption of Moisture

When hay is exposed to rain, it has the tendency to absorb moisture. This can lead to an increase in the hay’s water content and subsequently affect its nutritional composition. The absorption of moisture may cause the hay to become heavier and potentially result in spoilage if not managed properly.

1.2. Loss of Nutrients

The exposure of hay to rain can also result in the loss of certain nutrients. Water-soluble vitamins, such as vitamin C, are particularly susceptible to being leached out of the hay when it gets wet. Additionally, prolonged exposure to rain can lead to the breakdown of proteins and carbohydrates in the hay, further reducing its nutritional value.

1.3. Mold and Fungal Growth

Moisture from rain creates an ideal environment for mold and fungal growth on hay. Moldy hay can pose serious health risks to horses as it may contain mycotoxins, which can cause respiratory issues and digestive problems. Therefore, it is crucial to inspect hay for any signs of mold or fungal infestation before feeding it to horses.

1.4. Hay Storage Considerations

To minimize the impact of rain on hay nutrition, proper storage is essential. Storing hay in a well-ventilated, dry area can help prevent excessive moisture absorption and reduce the risk of mold growth. Hay should be kept off the ground and covered with a waterproof tarp or stored in a hay barn to protect it from direct rainfall.

1.5. Testing Hay Quality

If there are concerns about the nutritional quality of rain-exposed hay, it is recommended to have it tested by a reputable forage testing lab. This can provide valuable insights into the hay’s nutrient composition and help determine if any supplementation is needed to meet the dietary requirements of horses.

1.6. Feeding Rain-Exposed Hay to Horses

While rain-exposed hay may undergo some nutrient loss and quality degradation, it can still be safely fed to horses in certain circumstances. If the hay has only been slightly dampened and shows no signs of mold or fungal growth, it is generally considered acceptable for consumption. However, it is important to monitor horses closely for any adverse reactions and adjust their diet accordingly if necessary.

In summary, rain can indeed have an impact on hay nutrition, potentially leading to moisture absorption, nutrient loss, and mold growth. Proper storage and careful inspection of rain-exposed hay are crucial to ensure the safety and nutritional well-being of horses. Regular testing of hay quality and close monitoring of horses’ reactions can help maintain their optimal health despite the challenges posed by inclement weather.

Potential Dangers of Feeding Horses Rain-Soaked Hay

Feeding horses the right type and quality of hay is crucial for their overall health and well-being. However, hay that has been soaked by rain can pose potential dangers to horses. In this section, we will explore the risks associated with feeding horses rain-soaked hay and why it is important to avoid it.

1. Mold and Fungal Growth:

One of the main concerns with rain-soaked hay is the development of mold and fungal growth. When hay gets wet, it creates a moist environment that is ideal for mold spores to multiply. Moldy hay can lead to respiratory issues for horses, such as allergies and even more serious conditions like heaves. Additionally, certain types of mold can produce mycotoxins, which are harmful to a horse’s digestive system and overall health.

2. Nutritional Deficiencies:

Rain-soaked hay can also lose its nutritional value. The process of soaking and prolonged exposure to moisture can cause the hay to leach out essential nutrients, such as vitamins and minerals. This can result in an imbalanced diet for horses, leading to deficiencies and potential health problems in the long run.

3. Digestive Issues:

Feeding horses rain-soaked hay can increase the risk of digestive issues. Wet hay can ferment, leading to the growth of harmful bacteria in the horse’s gut. This can cause colic, which is a painful and potentially life-threatening condition. Horses may also experience diarrhea and other gastrointestinal problems when fed moldy or wet hay.

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4. Decreased Palatability:

Rain-soaked hay often becomes unappealing to horses due to its texture and taste. Horses may refuse to eat wet hay or consume it in smaller quantities, which can result in weight loss and nutritional deficiencies. This can be a significant concern, especially for horses that rely on hay as a primary source of forage.

5. Increased Risk of Laminitis:

Another danger associated with feeding horses rain-soaked hay is the increased risk of laminitis. Laminitis is a painful and potentially debilitating condition that affects the horse’s hooves. The moisture in wet hay can disrupt the delicate balance of nutrients in a horse’s diet, triggering an inflammatory response and leading to laminitis.

In summary, feeding horses rain-soaked hay can lead to a variety of potential dangers. From mold and fungal growth to nutritional deficiencies and digestive issues, it is essential to prioritize the health and well-being of horses by avoiding the use of wet hay. By providing horses with dry and high-quality hay, owners can help maintain their overall health and prevent unnecessary health complications.

Strategies for Managing Rained-On Hay for Equine Feeding

When it comes to managing rained-on hay for equine feeding, it’s important to have a plan in place to ensure the health and well-being of your horses. Rain-damaged hay can pose a variety of challenges, including mold growth, nutritional loss, and palatability issues. In this section, we will explore effective strategies for managing rained-on hay to minimize waste and keep your horses healthy.

1. Assessing the Damage

The first step in managing rained-on hay is to assess the extent of the damage. Inspect the hay bales for signs of mold, discoloration, and foul odors. Moldy hay can be harmful to horses and should be discarded. If the damage is minimal and limited to the exterior layers, you may be able to salvage the unaffected portions of the bales.

2. Segregating Damaged Bales

Once you have determined which bales are damaged, it is crucial to segregate them from the rest of the hay. This prevents cross-contamination and ensures that only the suitable bales are fed to the horses. Store the damaged bales separately and label them clearly to avoid any confusion.

3. Feeding to Less Picky Eaters

If you have horses that are less picky eaters or have no underlying health issues, you can consider feeding them the rained-on hay. Horses with robust digestive systems can tolerate mold spores to some extent without adverse effects. Monitor their health closely and discontinue feeding if any signs of discomfort or illness arise.

4. Mixing with Good Quality Hay

If you have a large quantity of rained-on hay, you can mix it with good quality hay to dilute any potential issues. By blending the damaged hay with fresh, clean hay, you can reduce the overall impact of the mold or nutritional loss. Conduct regular inspections to ensure the quality of the mixed hay remains acceptable.

5. Wetting or Soaking the Hay

In some cases, wetting or soaking the rained-on hay can help mitigate the effects of mold. Soaking the hay for 30 minutes to an hour can reduce the mold spore count and make it more palatable for the horses. However, be cautious not to oversoak the hay, as it can lead to excessive nutrient losses.

6. Providing Additional Forage Options

To compensate for any nutritional deficiencies in the rained-on hay, consider providing your horses with additional forage options, such as fresh pasture or high-quality hay. This ensures that they receive a well-balanced diet and minimizes the reliance on the damaged hay.

7. Regular Monitoring and Adjustments

Throughout the feeding process, it is crucial to monitor your horses closely for any signs of digestive upset or health issues. Regularly assess their body condition, fecal consistency, and overall well-being. Adjust the feeding regimen as needed to ensure optimal nutrition and minimize any negative impacts.

In summary, managing rained-on hay for equine feeding requires careful assessment, segregation of damaged bales, and strategic feeding approaches. By implementing these strategies, you can minimize waste, maintain the health of your horses, and ensure they receive a well-balanced diet. Remember to prioritize the safety and well-being of your equine companions when dealing with rained-on hay.

Alternative Forage Options for Horses in Rainy Weather

In areas that experience frequent rain during certain seasons, providing adequate forage for horses can be a challenge. Rainy weather can make it difficult for horses to graze on fresh pasture, as the ground becomes muddy and the grass becomes waterlogged. In these situations, it is important to have alternative forage options available to ensure that horses receive the necessary nutrients to maintain their health and well-being. This article will explore some alternative forage options for horses during rainy weather.

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1. Hay

One of the most common alternative forage options for horses in rainy weather is hay. Hay is dried grass or legumes that have been harvested and stored for feeding. It provides essential nutrients such as fiber, protein, and energy, which are necessary for proper digestion and overall health of horses. Hay can be fed in a variety of ways, including free-choice feeding or portioned meals, depending on the horse’s individual needs.

When selecting hay for horses, it is important to choose high-quality hay that is free from mold, dust, and other contaminants. Horses should have access to clean, fresh water at all times when consuming hay.

2. Haylage

Another alternative forage option for horses in rainy weather is haylage. Haylage is a fermented forage that is made by wrapping freshly cut grass or legumes in plastic and allowing it to ferment. This process preserves the nutrients in the forage and creates a moist, palatable feed option for horses.

Haylage has a higher moisture content compared to hay, which makes it ideal for horses that have difficulty chewing or horses that require a wetter feed due to dental issues or other health concerns. However, it is important to ensure that the haylage is properly fermented and stored to prevent the growth of harmful bacteria or molds.

3. Silage

Silage is another alternative forage option that can be considered for horses in rainy weather. Silage is made by chopping and fermenting whole plants, such as corn or grass, and storing them in airtight conditions. The fermentation process preserves the nutrients in the forage and creates a highly palatable feed option for horses.

While silage is primarily used in livestock production, it can be fed to horses in limited quantities as a source of additional forage. It is important to note that not all types of silage are suitable for horses, so it is recommended to consult with a nutritionist or veterinarian before incorporating silage into a horse’s diet.

4. Soaked Beet Pulp

Soaked beet pulp is another alternative forage option that can be beneficial for horses in rainy weather. Beet pulp is a byproduct of sugar beet processing and is available in dried form. When soaked in water, beet pulp expands and becomes a soft, fibrous feed option for horses.

Soaked beet pulp can be fed as a supplement to hay or other forage options, providing additional fiber and moisture to the horse’s diet. It is important to follow soaking instructions provided by the manufacturer to ensure the proper consistency and digestibility of the beet pulp.

5. Forage Balancer Supplements

In addition to alternative forage options, forage balancer supplements can also be considered for horses in rainy weather. These supplements are specifically formulated to provide the necessary vitamins, minerals, and nutrients that may be lacking in a horse’s forage-based diet.

Forage balancer supplements can help ensure that horses receive a balanced diet even when access to fresh pasture is limited due to rainy weather. It is important to consult with a nutritionist or veterinarian to determine the appropriate type and dosage of forage balancer supplement for a horse’s individual needs.


When rainy weather makes it difficult for horses to graze on fresh pasture, alternative forage options are essential for meeting their nutritional needs. Hay, haylage, silage, soaked beet pulp, and forage balancer supplements are all viable options to consider. Each option has its own benefits and considerations, so it is important to choose the most appropriate option based on the horse’s individual needs and consult with a nutritionist or veterinarian for guidance. By providing alternative forage options during rainy weather, horse owners can ensure that their horses remain healthy and well-nourished.

Best Practices for Hay Storage to Prevent Moisture Damage

Proper storage of hay is essential to maintain its quality and prevent moisture damage. Hay that is exposed to excessive moisture can lead to mold growth, nutrient loss, and even spontaneous combustion. To ensure your hay remains in top condition, follow these best practices for hay storage:

1. Choose a Well-Drained Storage Location

The first step in preventing moisture damage is to select a storage location that is well-drained. Avoid areas prone to flooding or areas with poor drainage. An elevated site with good airflow will help prevent water accumulation around the bales.

2. Use Appropriate Shelving or Pallets

When storing hay, it is important to keep it off the ground to prevent moisture absorption. Use shelving or pallets to elevate the bales and allow for air circulation underneath. This will also help reduce the risk of pests and rodents accessing the hay.

3. Cover Hay with a Waterproof Tarp

To protect your hay from rain or snow, cover the stacks with a waterproof tarp. Make sure the tarp is securely fastened to prevent it from blowing off in strong winds. This will help keep the hay dry and minimize the risk of moisture damage.

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4. Avoid Overstacking

Proper stacking is crucial to prevent compression and heat buildup within the hay bales. Overstacking can restrict airflow, leading to condensation and mold growth. Leave enough space between each stack to allow for proper ventilation.

5. Maintain Adequate Ventilation

Good ventilation is essential for hay storage. Ensure there is sufficient airflow around the bales by leaving enough space between stacks and maintaining proper clearance from walls. This will help dissipate moisture and prevent the growth of mold or mildew.

6. Regularly Inspect and Rotate the Hay

Regular inspections are necessary to identify any signs of moisture damage or mold growth. If any bales appear to be wet or moldy, remove them from the storage area immediately to prevent further contamination. Additionally, rotating the hay periodically can help prevent localized moisture buildup.

7. Monitor Humidity Levels

Monitoring the humidity levels in the storage area can help identify potential moisture issues. Use a hygrometer to measure the humidity and take appropriate measures if levels exceed acceptable limits. Installing proper ventilation systems or dehumidifiers may be necessary in high-humidity environments.

8. Keep Hay Storage Area Clean

Maintaining cleanliness in the hay storage area is crucial to prevent the introduction of mold spores or pests. Regularly remove any debris, dust, or old hay from the storage area. Keeping the area clean and free from potential contaminants will help preserve the quality of the stored hay.

9. Consider Using Hay Preservatives

In high-moisture environments, using hay preservatives can help prevent mold growth and extend the storage life of hay. Consider treating the bales with an appropriate preservative product to inhibit the growth of mold spores and maintain hay quality.

10. Plan Ahead for Seasonal Changes

Seasonal changes can significantly impact hay storage conditions. During wetter months, it may be necessary to take extra precautions to prevent moisture damage. Adjust your storage practices accordingly and be prepared to make modifications as needed to protect the hay from moisture.

In summary, proper hay storage is crucial to prevent moisture damage and maintain the quality of your hay. By choosing a well-drained location, using shelving or pallets, covering with a waterproof tarp, avoiding overstacking, maintaining adequate ventilation, regularly inspecting and rotating the hay, monitoring humidity levels, keeping the storage area clean, considering hay preservatives, and planning for seasonal changes, you can ensure that your hay remains in excellent condition for use.


Can horses eat hay that has been rained on?

It is generally recommended to avoid feeding horses hay that has been rained on. Rain can cause mold growth, which can be harmful to horses and may lead to respiratory issues and digestive problems. It is best to provide horses with fresh, dry hay to ensure their health and well-being.

What should I do if my horse won’t eat hay?

If your horse is not eating hay, it could be a sign of dental issues, digestive problems, or a lack of appetite. It is important to consult with a veterinarian to determine the underlying cause. In the meantime, you can try soaking the hay in water to make it more palatable or consider alternative forage options such as haylage or hay cubes.

How much water should a horse drink per day?

A horse should drink approximately 5 to 10 gallons (19 to 38 liters) of water per day. However, the actual water intake can vary depending on factors such as the horse’s size, activity level, weather conditions, and diet. It is important to provide horses with fresh, clean water at all times to prevent dehydration and promote proper digestion.


In conclusion, horses can eat hay that has been rained on, but it is not ideal. Rain can cause the hay to lose its nutritional value and can also promote the growth of mold and bacteria. It is essential to inspect the hay thoroughly before offering it to horses and discard any damp or moldy portions. Providing horses with fresh, high-quality hay is always the best practice to ensure their health and well-being. If rained-on hay is the only option available, it should be used sparingly and supplemented with other nutritious feed sources.

Remember, horses have sensitive digestive systems, and feeding them hay that has been rained on excessively or has become moldy can lead to digestive issues and even colic. It is always recommended to store hay properly and protect it from rain or moisture to maintain its nutritional content. Regularly monitoring the hay quality and consulting with a veterinarian or equine nutritionist can help ensure that your horses receive the best possible diet for their overall health and longevity.