I replaced the burners a couple years ago and noticed the crossmember rusting then, but definitely wasn't as bad as is in the picture and at the time seemed like the only bad spot on the grill. A couple years later and its seems like the rust really overtook the frame. I've noticed the moisture seems worse in our backyard in the last year or two. You can see green moss growing on the grill basket. Its also on a concrete slab which I've read can speed up corrosion.