A firewood cover is a piece that many rack manufacturers leave out. While racks are a good, simple way to keep your stacks up off the ground and organized, they often don't come with any top to protect from snow or rain.
You can use a simple tarp for this purpose. Any weatherproof vinyl material that can resist cracking long-term will work. The downside of this is that it may not fit your rack or stack securely. You may need to weigh or stake it down, and they tend to come loose during tough winter or wind storms. If you do go with a full cover understand that wood needs access to the air to dry and season. They are designed to be used with seasoned wood.
A dedicated cover usually is a step up in terms of functionality. You'll get a snugger fit and it often comes with an easy zip or velcro hitch to get easy acces to the wood.
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