Real depreciation math on exposed agricultural equipment — and why the gap between "stored inside" and "left outside" is wider than most operators think.
A new John Deere S7 or Case IH AF series combine rolls off the lot between $450,000 and $1,000,000 Canadian, depending on configuration. Even a mid-spec machine with a decent header package sits comfortably above $300,000. It's one of the most expensive single assets on most farming operations — and on prairie after prairie, it sleeps outside.
Not because the owner doesn't care. Usually because the building hasn't happened yet. There's always a reason: the shed project got pushed to next year, the old quonset is full of other equipment, the budget went to land or inputs instead. And so the combine sits. One winter becomes two. Two becomes five. And by the time you're ready to trade it in, the number the dealer puts on the table tells a story you weren't ready to hear.
This isn't a temperate climate. Alberta's combination of intense UV exposure, extreme cold, dramatic temperature swings, precipitation, and hail creates one of the most punishing environments for unprotected machinery in North America.
Consider what a single year delivers. Edmonton and central Alberta experience between 5 and 15 freeze-thaw cycles annually — each one driving moisture deeper into every crack, seal, and joint. Average precipitation ranges from 300 to 550mm. Winter humidity hits 91% to 93%, creating persistent condensation on cold metal surfaces. And Alberta's UV index in summer is intense enough to visibly degrade unprotected rubber and paint within a single season.
Then there's hail. Calgary averages five hail days per year. The Insurance Bureau of Canada reports $6 billion in Alberta hail damage over the last five years alone. Hailstones don't discriminate between roofs and combines.
The damage is cosmetic at first. UV begins oxidizing the paint's clear coat. Rubber components — belts, hoses, tire sidewalls, cab seals — start their slow decline as polymer chains break down under solar exposure. Moisture finds its way into electrical connectors and hydraulic reservoirs during temperature swings that create condensation inside tanks and housings. None of this shows up as a failure. It's all setup for what comes later.
Paint fading becomes visible, especially on dark surfaces and south-facing panels. Rubber seals on cab doors, windows, and hydraulic cylinders begin to harden and micro-crack from freeze-thaw cycling. The first hydraulic weeps may appear at cylinder rod seals — not enough to notice a puddle, but enough to leave a film that collects dust. Battery capacity starts its permanent decline. Tire sidewall cracking — dry rot — becomes evident, particularly on tires that haven't moved regularly.
This is typically when operators first notice something is wrong. Hydraulic leaks that were cosmetic become functional problems. Electrical gremlins appear — intermittent sensor failures, corroded connections causing voltage drops, GPS or yield monitor glitches traced to harness corrosion. Cab interior materials — plastics, foam, fabric — show UV damage through fading and brittleness. The combine still runs. But the repair frequency starts climbing, and the hours spent diagnosing electrical issues begin eating into productive field time.
Corrosion in structural members, frame components, and sheet metal progresses from surface rust to material loss. Bearing housings that have been cycling between wet and dry, hot and cold, for four years start showing play. Hydraulic pump efficiency declines as contaminated fluid — carrying water, oxidation particles, and worn seal material — scores internal surfaces. The machine's total annual maintenance cost is now measurably higher than an identical unit stored under cover.
At trade-in or auction, the reckoning arrives. The machine that could have been "above average" condition is firmly in "fair" or "below average" territory. The dealer walks around it and sees exactly what five winters of exposure look like: oxidized paint, cracked rubber everywhere, surface corrosion on unpainted steel, a cab interior that's aged a decade in half the time. Before the engine even starts, the number has dropped.
Normal depreciation on a combine runs roughly 25% to 30% of remaining value per year in the early years, declining as the machine ages. That's the baseline — what happens regardless of storage. Weather exposure adds an additional 2.5% or more in annual depreciation on top of that baseline, according to equipment valuation industry data.
On a $300,000 machine, that 2.5% weather premium translates to $7,500 per year in additional value loss — value that would have been preserved by keeping the machine under cover. Over five years, the compound effect produces a gap that's difficult to ignore.
| After 5 Years | Stored Under Cover | Left Outside |
|---|---|---|
| Estimated resale value | ~$150,000 | ~$100,000 |
| Extra depreciation from exposure | $0 | ~$37,500 |
| Cumulative maintenance & repair | ~$28,000 | ~$86,000 |
| Maintenance cost difference | ~$58,000 | |
| Total 5-year cost of exposure | $91,000 – $101,000 | |
That table isn't theoretical. It's built from equipment depreciation guides, auction data patterns from Ritchie Bros and Purple Wave, and repair cost trends tracked by agricultural extension services. The maintenance gap alone — $58,000 over five years — tells most of the story. The additional depreciation at resale tells the rest.
At a Ritchie Bros or online auction, bidders make rapid condition assessments based on visual cues. They're not running diagnostic tests. They're looking at the machine and making inferences about its history.
Faded, oxidized paint says: this machine sat in the sun. Cracked rubber on hoses and belts says: the seals inside are probably just as bad. Rust on unpainted surfaces says: moisture got everywhere. A cab interior with UV-damaged plastics and stained upholstery says: nobody babied this machine.
Each of those observations suppresses bids. Not by a little — by a lot. A well-maintained combine that was stored inside, washed regularly, and shows intact paint and clean rubber consistently attracts more bidders and closes at a premium. The machine stored outside, identical in hours and model year, closes at a discount that reflects the buyer's assumption: if the outside looks like this, what does the inside look like?
Farm equipment insurers aren't blind to storage conditions. While policies vary, the principle is consistent: equipment stored in a secure building represents lower risk. Some insurers offer 5% to 15% premium reductions for sheltered equipment. Over five years on a typical farm equipment policy, that can mean $3,500 to $7,500 in premium savings — not enough to pay for a building on its own, but another line item in the total cost of leaving things uncovered.
More importantly, when a claim is filed, adjusters assess pre-loss condition. Equipment that was visibly weathered before a hail event, fire, or theft may receive a lower payout under Actual Cash Value policies, because the depreciation applied at the time of loss reflects the machine's degraded condition. A combine worth $150,000 in "good" condition might be valued at $100,000 in "fair" condition for the same claim — a $50,000 difference that shows up when you need it least.
Canada's Capital Cost Allowance lets farmers claim depreciation on equipment for tax purposes — typically at a 30% declining balance rate under CCA Class 10. But tax depreciation and actual market depreciation are different things. The CCA rate is designed to be generous enough to encourage equipment investment, not to track real-world value loss.
What this means in practice: the tax write-off happens whether the machine is stored properly or not. You don't get a bigger deduction for letting it rot outside. But you do get a smaller cheque when you sell it. The tax benefit is fixed. The resale loss from exposure is variable — and entirely preventable.
A fabric building large enough to shelter a combine — say a 40×80 or 50×100 — costs a fraction of the $91,000 to $101,000 in cumulative losses that five years of exposure extracts from a single machine. Most operations park more than one piece of major equipment. Two machines exposed means double the loss. Three means triple.
The math isn't complicated. It just requires doing it before the damage is done, rather than discovering it at trade-in.
Your combine is depreciating right now. The question isn't whether — it's how fast, and how much of that speed is within your control. A roof over it changes the answer to both.
Transparent installation pricing for every building size — right on our website. No quotes, no callbacks.