My chickens have been out on their run for about a week now and it's currently grass. I know that won't last though so I'm starting to think about what I'm going to do after they've torn it up. I live in Seattle so it will need to hold up against a lot of moisture without getting too muddy. Fortunately the run is on a part of our lot that seems to drain well so at least we don't have to worry about water pooling in that area. Right now I'm leaning toward playground sand because I've heard it makes good footing and as a bonus it's super cheap! I'm planning to put it down this summer while it's dry so that the ground won't be torn up already... I learned the hard way with my horses not to try to throw down new footing on ground that's already a mud pit! So will sand hold up well in a climate as rainy as Seattle or do you guys have any suggestions that you think might work better?