Does Grass Seed Expire and How Do You Know

You are sipping coffee this morning, and you see a bare spot in your garden or in your front lawn. The sight pricks you, and you want to do something about it.

You go to your garden storage and find leftover grass seed in one of the containers.

The euphoria takes over (I know, I have been there too), but before you sprinkle that in your lawn, search for that tiny voice that asks, “How long has this grass seeds been there?”, “Does grass seed expire?

This may not be a dilemma for non-garden enthusiasts, but trust me when I say that you are going to need to answer these questions once in your life.

So for this article, we are going to talk about storage and the shelf life of grass seeds specifically.

A direct answer to the question

does grass seed have expiration date

To answer the question, yes, grass seeds do expire.

Like all other products, you can see the expiration date of the grass seed stamped on the bag.

Just like any product, too, grass seeds lose potency as they age. Thus, an expired grass seed will not really germinate no matter how much irrigation and oxidation you give it, no grass shall grow after you sprinkle it.

Other sites like Lawn Site would even go as brutal as telling you (honestly, I would do, too) to throw out your leftover grass seed if you do not intend to use it in the next two months.

The Spruce suggests that it is very important for us to know what affects the potency of grass seeds because this information is directly associated with expiration.

Knowing this is essential (and must be convincing enough) for us to not hold on to excess grass seeds anymore.

The following are some of the reasons why grass seeds become less potent when they are stored long:

– The moist content of the grass seed has lessened. Grass seeds that have low moist content are most likely to die because they won’t thrive well in humidity.

– They have lost potency because of storage temperature. Being exposed to changing and extreme temperatures lose the viability of grass seeds to grow. Not only do grass seeds expire, but if stored in unideal temperatures, they would lose potency even before they expire.

How do I know if my grass seeds have expired?

This question is totally understandable. 

Some grass seed bags only have visible packing dates but have blank expiration dates (I am basing this on experience). 

If this happens, checking if the leftover grass seed is expired is easy to detect.

I can recommend two easy ways to identify an expired grass seed.

First, check the bag if it is damp or if it has a weird odor as soon as you pick it up.

If it is not damp or smelly, open the bag and look for clumps or any form of discoloration.

The clumps and discoloration may be due to fungi contamination because of the moisture inside the bag.

If one of these two happens to your excess grass seeds, they sure are expired.

The expiration date is a few months away. Can I still use my stored grass seeds?

If you are one of the many who may have this question in mind, allow me first to commend you for being risk takers because while the answer is a clear yes, it is always a risk to use it near its expiration date because, for sure, the germination percent shall be very low.

If by a few months you mean two to four months away, I suggest that you weigh it on a bit.

If the work, effort, and the thought that you might re-seed your grass again because it did not grow out as you expected, then go for it. But if not, you might as well learn from this lesson and buy a new stack.

You may also be asking this because you were not too aware that the grass seeds stacked on the shelves when you bought them had different expiration dates.

I suggest that the next time you buy one, make sure that you see the expiration date.

Grass seeds normally expire after 12 to 18 months, so technically, you are given ample time to use them.

Plus, it is quite pricey, so it will be for your benefit to use it at its peak health.

For this question, I suggest that you watch these videos on YouTube posted by Christian Country Living and Garden and Lawn

does scotts grass seed expire

How can I preserve grass seed?

I don’t want this to happen again. What can I do?

I have already mentioned that the average shelf life of grass seeds is twelve to eighteen months.

Some sites like the Peak Yard say that it can even last up to 36 months, depending on the type.

The recommended storage procedure boils down to just two things:

Store at room temperature. Keep out from direct exposure to sunlight, or just make sure that where you store it is dry.

– If possible, keep it in its original pack or bag. Almost all grass seed bags are made of polypropylene, which avoids moisture from entering the bag. But still, there is sturdier packaging. If you are thinking of buying new stacks of grass seeds with sturdy packaging, I suggest Scotts Turf Grass Seed, Scotts EZ Seeds Patch and Repair, Marley’s Cat Grass, and Hancock’s Pensacola Bahia Grass Seed.


If you will have further questions after this, please feel free to comment with your queries.

At best, we established that grass seeds do expire.

Because of this fact, we need to make sure that we get the most out of the life expectancy of the grass seeds that we buy.

Planting grass seeds that are near expiration is quite a risk, but if you can make it work, then well and good.

One thing is for sure, though, to prevent this from ever happening again, see to it that you follow the necessary storage procedures.

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Ben Bareja

Ben Bareja, the owner-founder-webmaster of This website was conceptualized primarily to serve as an e-library for reference purposes on the principles and practices in crop science, including basic botany. Read more here

1 thought on “Does Grass Seed Expire and How Do You Know”

  1. Some of the bags at Lowe’s have a second sticker on top of the original one, with a new test date and expiration date. I’m guessing the manufacturer test the lots from bags they have stored at their facilities and issues new tags, is that correct?


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