5 Steps for Better Grain Sampling

Harvest is busy, but taking time to sample properly pays off. A good sample is the foundation for fair grading, accurate pricing, and smooth delivery. A poor sample, on the other hand, can create unexpected disputes and downgrades. 

Here are five key tips we’ve adapted from the Canadian Grain Commission; to help you collect the best possible samples this harvest. 

Step 1: Equip Yourself Properly 

The right tools make the job easier and more reliable. Keep these on hand: 

1. A rigid-handled scoop that holds 50–200 grams 

2. Several 20 L pails for raw collection and sample splitting 

3. A few 2 kg sample bags for buyers 

4. One 4 L pail for your own retained sample 

5. A tarp or large hopper to contain spills when dividing grain 

Image Source: Canadian Grain Commission

Step 2: Sample Every Load Into a Bin 

Don’t skip loads. Every truck unloaded into a target bin needs to be sampled. While the grain is flowing, reach across the full stream with your scoop. This avoids bias and ensures each part of the load is captured. 

Image Source: Canadian Grain Commission

Step 3: Collect Throughout the Unload 

Samples should represent the entire unload, not just one moment. Take scoops at regular intervals; from the start of unloading through to the finish. Do this until you’ve collected roughly three-quarters of a 20 L pail per truck. 

Step 4: Build a True Bin Sample 

Once each truck has been sampled, it’s time to combine them into a representative bin sample. This is done by “splitting down”: 

• Pour a truck sample evenly into two pails. 

• Discard one half. 

• Repeat the process until only ⅛–¼ of a 20 L pail remains. 

• Add this reduced portion to the bin sample. 

• Do this the same way for every truckload. 

To prepare samples for buyers, repeat the splitting process with the bin sample until you have uniform 2 kg bags. Always keep an additional 4 L pail sample on the farm for reference in case questions come up later. 

Step 5: Label Everything Right Away 

Clear labelling keeps things organized when dozens of samples start piling up. Include: 

• Farm name 

• Bin description 

• Tonnage 

For your retained pail, add extra notes such as harvest dates, field locations, or agronomic details you may want later. 

Why It Matters 

Sampling isn’t just a routine chore—it’s the proof of your grain’s quality. Accurate, representative samples reduce disputes, protect your pricing, and give buyers confidence in your deliveries. 

For more detail on stream sampling and other methods, see the Canadian Grain Commission’s full guide.