Is a Grain Dryer Worth It? The Payback Math

Grain drying · 6 min read

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Asking whether a grain dryer is worth it comes down to one number: your cost per bushel dried on the farm versus what the elevator charges you for wet corn. The elevator's moisture schedule looks simple on the rate card, but once you add shrink, handling, and the hidden cost of waiting on field drying, the math usually favors drying at home — if you run enough bushels. Here's how to run the numbers.

What drying actually costs per bushel on the farm

A grain dryer burns propane and electricity to remove moisture points. A good rule of thumb is about 0.02–0.025 gallons of propane per point of moisture removed per bushel. At $1.60 per gallon, removing 7 points (from 22% down to 15%) costs roughly $0.22–$0.28 per bushel in fuel. Add electricity for fans and augers at another $0.03–$0.05 per bushel, plus maintenance and labor.

But the biggest line item is shrink, and it's the same whether you dry at home or the elevator dries for you. Corn loses about 1.4% of its weight per point of moisture removed. Taking 22% corn down to 15% means roughly 9.8% shrink — on a $4.50 market, that's about $0.44 per bushel of lost weight. Shrink isn't a drying cost, though; it's physics. You lose it either way, so it cancels out of the comparison.

What the elevator charges for wet corn

Most elevators charge a drying fee of $0.035–$0.06 per point of moisture above 15%, plus their own shrink factor (often 1.4–1.5% per point). On that same 22% corn at a $0.045-per-point schedule, you're paying about $0.32 per bushel in drying charges — roughly $0.05–$0.10 more per bushel than your on-farm fuel and electric cost. On 100,000 bushels, that gap is $5,000–$10,000 per year straight to the bottom line.

And the schedule only covers grain at or above the elevator's scale. If you deliver corn at 26% in a wet fall, some buyers dock you harder or refuse it outright until it airs down — leaving you with wet corn, a full bin, and no place to put it.

Worked example: 100,000 bushels at 22% moisture

Here's the annual math for a mid-size operation drying 100,000 bushels of corn from 22% to 15%:

Line item	Per bushel	Annual total
Propane (7 pts × 0.022 gal × $1.60)	$0.25	$25,000
Electricity	$0.04	$4,000
Maintenance & labor	$0.03	$3,000
Total on-farm drying cost	$0.32	$32,000
Elevator drying charge (7 pts × $0.045)	$0.32	$32,000
Avoided extra handling / shrink disputes	$0.06	$6,000
Net annual benefit of owning		$6,000+

On a $120,000 dryer, that $6,000-a-year savings alone gives a 20-year payback — which looks terrible. But that table leaves out the two biggest payback drivers.

The inputs that actually move the payback

• Bushels dried per year. This is the single biggest lever. Double the bushels and you roughly double the savings while the dryer payment stays fixed. A dryer that barely pencils at 60,000 bushels can pay back in 4–6 years at 150,000.
• Early harvest. Starting harvest at 25% moisture instead of waiting for 18% can buy you 7–14 extra harvest days. Field losses from stalk lodging, ear drop, and wildlife run 0.5–1% per week of delayed harvest — on 100,000 bushels at $4.50, that's $2,250–$4,500 per week saved.
• Wet-year insurance. In a wet fall, the spread between your cost and the elevator's schedule widens, and elevators may stretch delivery times. The dryer pays for itself fastest in the years you'd least want to be without it.
• Propane price. At $1.20/gal your per-bushel cost drops to about $0.18; at $2.20/gal it climbs past $0.35. Locking in summer-fill propane is part of the strategy, not just the math.

When the payback doesn't work

A grain dryer usually does not pencil if you run under 40,000–50,000 bushels a year, if you consistently harvest at 18% or below, or if your elevator's drying schedule is unusually cheap. In those cases, selling wet and letting the elevator dry is often the right call — and the math will tell you so before you write the check.

The honest way to decide: plug in your bushels, your moisture, your propane price, and your elevator's schedule. Generic rules of thumb get you in the neighborhood; your own numbers get you a payback year you can take to the bank.