Are organic oats glyphosate-free?

Usually close to it. Organic farming does not allow glyphosate. In EWG’s first 2018 tests, most organic oat samples had none detected, and the ones that did had small amounts, 10 to 30 parts per billion, likely from drift or shared processing.

Why are oats sprayed with glyphosate?

Some farmers spray glyphosate shortly before harvest to kill weeds and dry the crop evenly, which makes harvesting easier in cool, wet climates. Because it is applied close to harvest, it can leave more residue on the grain.

Do gluten-free oats have less glyphosate?

Not necessarily. A gluten-free label means the food meets FDA rules for gluten. It does not tell you anything about glyphosate.

How much glyphosate is in oatmeal?

It varies widely by product and batch. In EWG’s 2018 tests, conventional oat products ranged from none detected to about 2,840 parts per billion, and most were above EWG’s benchmark of 160. Its 2023 report found lower levels on average. The EPA’s legal limit for oat grain is 30 parts per million.

Is it safe to eat oats with glyphosate?

The EPA says residues below its limits are safe, while some groups, including EWG, argue the limits should be much lower, especially for children. If you want to minimize exposure, choose organic or certified residue-free oats.

Glyphosate-Free Oats: Why Oats Test High

Key takeaways

Some farmers spray glyphosate on oats shortly before harvest to kill weeds and dry the crop, which can leave more residue on the grain.
In EWG’s first 2018 tests, 43 of 45 conventional oat samples had glyphosate, and 31 were above EWG’s own benchmark of 160 parts per billion. Organic samples had much less.
Newer EWG testing reported in 2023 still found glyphosate in every conventional sample, but at lower levels on average.
The EPA’s legal limit for oat grain is 30 parts per million, or 30,000 parts per billion. “Legal” and “low” aren’t the same thing.
For the least glyphosate, choose USDA Organic oats, or oats certified “Glyphosate Residue Free” by an independent tester.

Why oats often test positive

Oats are usually grown in cool, northern climates where the crop can dry unevenly. Some farmers spray glyphosate shortly before harvest. It kills weeds and helps the oats dry down so they can be harvested sooner.^[4]

Because the spray goes on so close to harvest, more of it can remain on the grain than when glyphosate is used only on weeds early in the season. Farm extension experts say this use stays within legal limits.^[4] Critics say the limits themselves are too high.^[2]

For background on the chemical itself, see our guide to glyphosate in food.

What the tests found

The Environmental Working Group (EWG), an advocacy group, has had oat foods tested several times since 2018.

Oat samples with glyphosate detected (EWG, first 2018 round)

Conventional (45 tested)43 of 45
Organic (16 tested)5 of 16

EWG, August 2018.^[1] 31 of the 45 conventional samples were above EWG’s 160 ppb benchmark. The five organic samples with glyphosate had small amounts, 10 to 30 ppb, which EWG said likely came from drift or shared processing.

In a second 2018 round, EWG found glyphosate in all 28 conventional oat samples it tested, and 26 were above its benchmark. The highest was close to 2,840 parts per billion, in a sweetened oat cereal.^[2]

In 2023, EWG reported newer tests. Glyphosate still showed up in every conventional sample, but levels were lower on average, and fewer than a third were above its benchmark. Some products that tested near 3,000 parts per billion in 2018 came in far lower.^[7]

What the limits mean

Two numbers come up a lot, and they’re far apart. Parts per million (ppm) and parts per billion (ppb) measure how much of a substance is in food. One ppm equals 1,000 ppb.

Glyphosate in oats: two very different lines
Who sets it	Amount	What it is
U.S. EPA	30 ppm (30,000 ppb)	The legal limit (tolerance) for oat grain. Food over it can be seized.
EWG	160 ppb	EWG’s own screening benchmark for children, assuming a 60-gram serving every day. It is not a government limit.

Sources: EPA tolerance list and EWG.^[3]^[4]^[1]

The EPA says residues within its limits are safe.^[3] EWG argues its much lower benchmark better protects children.^[2] Most conventional oats in EWG’s 2018 tests fell between the two: legal, but above EWG’s line.

How to choose glyphosate-free oats

Buy USDA Organic. Organic farmers can’t use synthetic weed killers like glyphosate. Traces can still drift in, but EWG’s organic results were far lower.^[1]
Look for “Glyphosate Residue Free.” This certification means testing found no glyphosate above the lab’s detection limit, usually 10 ppb. That’s very low, though not proof of zero.^[6]
Check the brand’s sourcing. Some oat millers publish test results or buy only from farmers who don’t spray before harvest. If it isn’t on the label, ask.

Keep eating oats

Oats contain beta-glucan, a soluble fiber linked to heart health. Oat foods that meet FDA rules can carry a health claim: eating 3 grams of oat beta-glucan a day, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease.^[5]

Oats are also much lower in arsenic than rice, which makes them a good grain to rotate in. See arsenic in rice.

Questions people ask

Are organic oats glyphosate-free?: Usually close to it. Organic farming does not allow glyphosate. In EWG’s first 2018 tests, most organic oat samples had none detected, and the ones that did had small amounts, 10 to 30 parts per billion, likely from drift or shared processing.
Why are oats sprayed with glyphosate?: Some farmers spray glyphosate shortly before harvest to kill weeds and dry the crop evenly, which makes harvesting easier in cool, wet climates. Because it is applied close to harvest, it can leave more residue on the grain.
Do gluten-free oats have less glyphosate?: Not necessarily. A gluten-free label means the food meets FDA rules for gluten. It does not tell you anything about glyphosate.
How much glyphosate is in oatmeal?: It varies widely by product and batch. In EWG’s 2018 tests, conventional oat products ranged from none detected to about 2,840 parts per billion, and most were above EWG’s benchmark of 160. Its 2023 report found lower levels on average. The EPA’s legal limit for oat grain is 30 parts per million.
Is it safe to eat oats with glyphosate?: The EPA says residues below its limits are safe, while some groups, including EWG, argue the limits should be much lower, especially for children. If you want to minimize exposure, choose organic or certified residue-free oats.

Sources

[1]Environmental Working Group. Breakfast with a dose of Roundup? Weed killer in oat-based foods. August 2018.
[2]Environmental Working Group. Roundup for breakfast, part 2: In new tests, weed killer found in all kids’ cereals sampled. October 2018.
[3]U.S. Environmental Protection Agency. Glyphosate. accessed October 2026.
[4]Oklahoma State University Extension. Glyphosate use as a pre-harvest treatment: Not a risk to food safety. accessed October 2026.
[5]Electronic Code of Federal Regulations. 21 CFR 101.81: Health claims: Soluble fiber from certain foods and risk of coronary heart disease. accessed October 2026.
[6]The Detox Project. Glyphosate Residue Free certification. accessed October 2026.
[7]Environmental Working Group. Going, going, gone? EWG finds glyphosate levels drop in oat-based products. April 2023.
[8]U.S. Food and Drug Administration. Questions and answers: Gluten-free food labeling final rule. accessed October 2026.

This article is for general information. It is not medical advice and does not replace a doctor, dietitian or pediatrician. Purus gives estimates for general information; it is not a medical device and does not diagnose, treat or prevent any condition.

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Glyphosate-free oats: why oats test high and how to choose