Hay vs Grass for Horses The Complete Canadian Owner Guide

If you're new to horse ownership, you've probably heard the words "hay" and "grass" used almost interchangeably. Someone tells you to make sure your horse has enough grass, and the next person tells you to make sure you've got enough hay stocked up for winter. So which is it?

Are they the same thing, or is there an important difference every horse owner in Canada needs to understand?

The short answer: grass and hay are closely related, but they are not the same thing and understanding the difference is one of the most important pieces of forage knowledge you can have, especially if you're managing a horse through a Canadian winter.

 In this guide, we'll break down exactly what separates grass from hay, whether horses can survive on one or the other alone, the different types and forms of hay available, and how to choose the right hay for your horse.

What Is the Difference Between Grass and Hay?

Let's start with the basic question: is grass and hay the same thing?

Not exactly but they're closely connected. Grass is living, growing forage in a pasture. It's rooted in the ground, actively photosynthesizing, and constantly changing in nutritional content as it grows, matures, and responds to weather.

Hay, on the other hand, is grass that has been cut, dried, and cured for storage. In simple terms, hay is preserved grass.

So what is the difference between grass and hay in practical terms? It comes down to the curing process. When grass is cut for hay, it goes through a drying period in the field where moisture content drops from around 80% (typical of fresh growing grass) down to somewhere between 12–18%, depending on the type of bale.

This moisture reduction is what allows hay to be stored for months sometimes over a year without spoiling, provided it's kept dry.

During this curing process, some things change:

• Moisture content drops dramatically, which concentrates the remaining nutrients
• Some vitamin content decreases (particularly Vitamin A and E, which degrade with light and time)
• Fiber structure becomes more stable, which is actually beneficial for digestion
• Sugar and starch levels can shift depending on when the grass was cut and how it was cured

So while hay comes from grass, by the time it reaches your horse's feeder, it behaves differently in terms of nutrition, digestibility, and how your horse's body processes it. This is why so many owners ask about hay vs grass for horses as if they're two separate feeding categories because functionally, they are.

Can Horses Survive on Grass Only?

This is a common question, especially from new owners who picture horses living entirely on open pasture. And it's a fair question after all, wild horses do exactly that.

Historically, wild and feral horse populations have survived almost entirely on grazing grass. This leads to a related question a lot of people ask: how are horses so strong if they only eat grass? The answer lies in a few key factors that don't always translate to domesticated horse management:

• Wild horses graze constantly, often 16–20 hours a day, across large territories with varied plant life
• Natural selection plays a role — horses that couldn't thrive on available forage simply didn't survive or reproduce as successfully
• Wild horse lifespans and workloads differ significantly from domesticated horses, who are often asked to perform, compete, or maintain specific body conditions humans have decided on
• Body condition standards are different — a "healthy" wild horse and a "healthy" show or performance horse are judged by very different criteria

For a domesticated horse in Canada, relying on grass alone comes with real limitations. Pasture quality varies dramatically by season lush and sugar-rich in spring, nutrient-sparse by late summer, and completely unavailable once snow covers the ground.

A horse living purely on seasonal pasture in Alberta would face months of inconsistent or nonexistent forage, which is neither safe nor practical.

Can Horses Survive on Just Hay?

Flip the question around, and the answer becomes much more straightforward: yes, horses can absolutely survive and thrive on hay alone, provided it's good-quality, appropriately selected hay.

In fact, for the majority of domesticated horses across Canada, hay is the primary forage source for at least half the year, and for many boarding and stabled horses, it's the primary forage source year-round.

Hay can supply everything a horse's digestive system evolved to process: consistent long-stem fiber, steady energy, and (when properly selected or tested) appropriate protein and sugar levels.

The key word here is "appropriately selected." Just as with grass, not all hay is created equal, and a horse's specific needs age, workload, metabolic status should guide which type of hay makes up their diet. We'll cover hay selection in more detail shortly.

Why Do Horses Eat Hay and Not Grass Especially in Canada?

This brings us to one of the most practical questions for owners in this country: why do horses eat hay and not grass, particularly for such a large part of the year?

The answer is almost entirely about climate and access. Most of Alberta and much of Canada has a grazing season that realistically runs from May through October and even that window can shrink depending on the year's weather.

Once snow covers the ground, typically from November through April, pasture grazing becomes impossible or severely limited.

This creates a clear operational reality for Canadian horse owners:

• Hay bridges the five-to-six-month gap when pasture simply isn't available
• Hay allows for consistent, testable nutrition — you know exactly what your horse is eating, which isn't possible with variable pasture
• Hay is storable and transportable, making it practical for farms, boarding barns, and backyard horse properties alike
• Hay quality can be controlled and verified through nutritional analysis, while pasture composition is much harder to manage precisely

For farms and ranches across the country, stored hay isn't a backup plan it's the backbone of winter feeding operations.

This is exactly why so much of the horse feed industry in Canada is built around hay production, testing, and supply rather than pasture management alone.

Available Forms of Hay

Once you've decided hay is going to make up a significant part of your horse's diet, it helps to know that hay doesn't only come in one form.

Depending on your setup whether you're running a large operation or keeping one horse on a small acreage different forms of hay may suit you better.

Baled hay is the most traditional and widely used form:

• Small square bales — easy to handle, ideal for backyard owners or smaller barns
• Large square bales — more cost-efficient for bigger operations, but require equipment to move
• Round bales — economical for larger herds or free-choice feeding setups, common on ranches

Compressed or bagged hay is a more recent option, popular for its convenience:

• Easier to transport, especially for owners without a truck and trailer
• More consistent moisture protection since it's bagged
• Great for horse owners who travel or compete and need forage on the road

Hay cubes and pellets offer an alternative form worth knowing about:

• Compressed, processed hay that's easier to store and measure
• Particularly useful for senior horses with dental issues who struggle with long-stem hay
• Convenient for travel, since they take up less space than baled hay

Haylage is less common in general horse-keeping but worth mentioning:

• A semi-fermented forage baled at a higher moisture content than dry hay
• Requires careful storage due to fermentation risk
• More commonly used in specific regions or specialized operations

Understanding these forms matters because your feeding setup, storage space, and horse's individual needs (like dental health or travel requirements) should all factor into which form works best.

Types of Hay

Beyond the form hay comes in, there's also the type of hay to consider meaning the actual plant species the hay is made from. This is where hay selection really starts to matter for your horse's health.

Grass hays are generally lower in protein and calories, making them a safer default for most horses:

• Timothy hay — one of the most widely used and trusted grass hays in Canada, known for its lower sugar content and high fiber
• Orchard grass — soft and palatable, slightly higher in sugar than timothy but still a solid grass hay option
• Brome — another common grass hay in parts of Canada, often used in mixed pastures and hay fields

Legume hays are higher in protein and calcium, better suited to specific life stages or workloads:

• Alfalfa — energy-dense, high protein, ideal for growing horses, lactating mares, or hard-working performance horses
• Clover — less common as a standalone hay but sometimes found in mixed hay

Mixed hays combine grass and legume species in a single bale, offering a middle-ground nutritional profile.

A timothy/alfalfa mix, for example, balances the lower calorie density of grass hay with the added protein of alfalfa a combination many Canadian horse owners find works well for horses in moderate work.

If you want a deeper breakdown of how these two major categories compare, our full guide on Timothy Hay vs Alfalfa Hay for Horses in Canada walks through the nutritional differences, when to use each, and how to transition safely between them.

Hay Selection: How to Choose the Right Hay for Your Horse

With so many forms and types available, how do you actually choose? A few core factors should guide your decision:

• Age — growing horses and seniors often need different protein and fiber profiles than mature horses in light work
• Workload — performance horses generally need more energy-dense hay than horses in light or no work
• Metabolic status — horses with insulin resistance, PPID, or a history of laminitis need hay with controlled sugar and starch (NSC) levels
• Regional availability — in Alberta, timothy and timothy/alfalfa mixes are widely available and well-suited to the local climate and growing conditions

Beyond matching hay type to your horse's needs, quality assessment matters just as much. Visual and smell inspection can catch obvious problems — but they only go so far. For a full breakdown of what to look for (and what to avoid), our guide on 7 Signs You're Buying Bad Hay covers the details.

And for horses with metabolic concerns specifically, hay selection becomes a health issue, not just a nutrition preference. Our complete resource, Low Sugar Hay for Horses: What Canadian Owners Should Know, covers everything from NSC levels to testing and soaking.

If you're looking for a ready-made option that balances both grass and legume benefits, our Levante Timothy/Alfalfa Round Bales offer a clean, screened, balanced mix suited to a wide range of horses. For owners who need an easy-to-store, easy-to-feed alternative, Summit Forage Timothy/Alfalfa Cubes provide the same balanced nutrition in a more convenient form.

Hay vs Grass for Horses: Pros and Cons

To bring everything together, here's a straightforward comparison:

 

Neither option is inherently "better" in isolation they serve different purposes. Grass offers natural grazing behavior and hydration during the months it's available. Hay provides the year-round consistency and control that Canadian horse owners need to fill the months when pasture simply isn't an option.

Conlusion:

At the end of the day, grass and hay aren't competing options they're the same forage at different stages of its life. Grass is the living plant; hay is that same plant preserved for the months when growing pasture isn't available.

For horse owners across Canada, hay isn't a fallback or a lesser substitute for "real" grazing it's the backbone of a properly managed feeding program for at least half the year, and often longer.

Understanding how to select the right type, form, and quality of hay for your specific horse is one of the most valuable skills you can develop as an owner.

If you're ready to source tested, high-quality hay for your horse, browse our full selection at Horse Creek Hay & Feed, or reach out directly — we're always happy to help match the right forage to your horse's specific needs.