Uncovered for over 15 years, outside on the deck, no roof, nada. I lived in the Chicagoland area and currently live in central IL. I have a Genny with the side burner, an SSP with gas assist (gas assist not currently working) and a 18 WSM. Other than some rust through the base of the WSM they're all in good shape. Oh and the rails that hold the drip pan on the Genny rusted through and we had to drill out the screws and replace them. Mine are cookers, not lookers but this year for the first time I dragged them out to the lawn and gave them a bit of a scrub. These were my ex's grills and he never covered them. I've done a bit of spiffing and replacing parts this year so I'm thinking of covering them this winter, although I do grill year round.
Frankly, it's s testament to how well these pups are made that the only rust through has been in the WSM (bottom bowl from accumulated water siting in it) and I recently fixed that with a touch of high heat silicone. I've replaced parts here and there but nothing too extreme.
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