Tractors, grain dryers, augers and hog barns all run loud enough to damage hearing, and harvest season stacks the exposure up fast. Here are the real numbers, and protection that works with farm life instead of against it.
If you farm, you've been told to wear earplugs more times than you can count. You've probably also spent a twelve-hour day in the combine, backed a grain truck up to a running auger, and gone to bed with your ears ringing anyway. Farming hearing loss isn't a lack-of-information problem, it's a "the advice never fits the work" problem.
So this article skips the lecture. Instead, here are the actual noise numbers behind common Prairie equipment, how quickly a harvest season uses up your ears' safe limit, and the protection strategies that hold up in real farm conditions, including a few things most producers have never been told, like why custom-moulded plugs work better under a set of muffs, and where WCB Manitoba fits in for hired farm workers.
Sound is measured in decibels (dB), and the scale is logarithmic, every 3 dB increase roughly doubles the sound energy hitting your inner ear. Manitoba's workplace rules treat an average of 85 dB over an eight-hour day as the line where hearing protection and conservation measures kick in.
Here's where common farm equipment sits, based on measurements published by agricultural health and hearing research organizations:
Notice that almost everything on that list sits above the 85 dBA mark. The cab is the exception, which is why keeping the windows shut and the door sealed matters more than most people think.
The 85 dBA limit assumes a full eight-hour day. For every 3 dB above that, the safe exposure time is cut in half. Using the exposure limits recommended by NIOSH (the U.S. occupational health institute whose 3 dB exchange rate matches the approach used in Manitoba):
Read that against the equipment list above. An open-station tractor running in the mid-90s uses up a full day's safe exposure before your morning coffee break. A grain dryer at 105–110 dBA gets through your entire daily allowance in a few minutes of standing next to it.
And here's the part harvest makes worse: those limits assume you stop at the end of the day. During seeding and harvest, sixteen-hour days are normal, there's no quiet weekend to recover, and the exposure runs for weeks. Your ears never get the rest the math assumes they will. Noise damage is cumulative, every overexposed day adds to the total, and the total never goes back down.
Farming consistently ranks among the occupations with the highest rates of noise-induced hearing loss. U.S. national occupational health data (NIOSH) found that within the agriculture, forestry, fishing and hunting sector, some industries show hearing loss in as many as one in three noise-exposed workers. A 2025 research review of studies on farm workers found hearing loss rates ranging from roughly 46% to 98% depending on the population studied and how hearing loss was defined, startlingly high numbers by any measure.
Why so high? A few reasons stack together:
If you want the broader picture of how noise damages hearing, we've covered it in our guide to noise-induced hearing loss prevention for Canadians.
Farmers don't skip hearing protection out of stubbornness. Foam plugs fall out when you're sweating, muffs get knocked off climbing in and out of equipment, and anything that blocks the sound of a struggling bearing or an approaching truck feels like a hazard of its own. The fix is matching the protection to the job.
Custom plugs are made from an impression of your own ear, so they seal properly without the constant re-rolling and re-fitting foam needs. They're washable, they last for years, and because they fit right the first time, they actually get worn. They also sit flush in the ear, which means you can wear a set of muffs over them for the loudest jobs. Doubling up like that is the practical answer for grain dryers, chainsaw work and older open-station equipment, where one layer of protection isn't enough on its own. We make custom-fit hearing protection right here in Winnipeg, including filtered styles that cut the roar while still letting you hear speech and machine sounds.
Electronic muffs and earplugs use small microphones to pass normal sound through, conversation, engine tone, that ticking you want to catch, while instantly clamping down when the noise spikes. For producers who need to stay in touch on a two-way radio or hear what's happening around them, this style removes the biggest excuse for leaving the ears bare.
Hearing damage from noise almost always follows the same pattern, and the early signals are easy to brush off:
That temporary ringing after a loud day is your inner ear telling you it got hurt. Do it enough times and temporary becomes permanent. If any of this list sounds familiar, our post on the signs you need a hearing test goes deeper, and a baseline hearing test now gives you something to measure against later, even if your hearing turns out fine.
Here's something many people in Manitoba agriculture don't realize: hired farm and agricultural workers must be covered by WCB Manitoba. Farm owners and their family members aren't required to be covered, but owners can purchase optional coverage for themselves and family members who work on the farm.
That matters for hearing, because WCB Manitoba accepts claims for noise-induced occupational hearing loss, generally where a worker was exposed to workplace noise averaging 85 decibels over eight-hour days for at least two years. Accepted claims can cover hearing aids, batteries, repairs and replacements. If you've spent years as a hired hand around equipment, or you employ workers who have, it's worth understanding how the system works. We've written a full walkthrough in our WCB Manitoba hearing loss claims guide.
No. Noise-induced hearing loss happens when the microscopic hair cells in the inner ear are damaged, and those cells don't grow back. That's the honest reason prevention gets repeated so often, hearing aids can help a great deal, but nothing restores the hearing you had. The ringing or muffled feeling after a loud day may fade, but repeated episodes leave permanent damage behind.
Often, yes, with the door and windows closed, a modern sealed cab typically brings levels down to roughly 76–87 dBA, which is manageable for a working day at the quieter end of that range. But the cab only protects you while you're in it. The moments outside the cab, dryers, augers, the shop, livestock, are where most of the risky exposure happens, so keep plugs or muffs within arm's reach for those.
For sound in the 105–110 dBA range, use double protection: well-fitted earplugs (custom-moulded ideally) underneath earmuffs. A single layer, even a good one, leaves you with very little safe time next to a dryer. And remember that limiting your minutes near it counts as protection too.
Not automatically. In Manitoba, farm owners and their family members are exempt from mandatory WCB coverage, though owners can buy optional coverage. Hired farm workers, on the other hand, must be covered by their employer. Either way, a hearing assessment is free at our clinic, so checking where your hearing stands costs you nothing.
Whether you want a baseline before another harvest, you've noticed the ringing sticking around longer, or you want custom protection made for the way you actually work, we're here to help. Prairie Hearing Centre offers free comprehensive hearing assessments, no referral needed. We're an independent, family-owned clinic on Corydon Avenue in Winnipeg, and to us you're not just a neighbour, you're family. Call (204) 306-9144 or book online. Find us at Unit 4-2090 Corydon Avenue, Winnipeg, open Monday to Friday, 9:00 to 4:30 (closed 12–1).