Depends on how dry you keep it. If I was building this directly on the ground in a rainy area, I would definitely be trying to find a way of either diverting run-off, providing a foundation with a solid floor or otherwise protecting the base of the structure from the rain. Moldy hay would not be a good place for the birds, I don't think. Maybe wrapping the bottom bales in good, heavy mil plastic as a barrier for this?
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