Based on the original post and the work that has already been done. "Home Depot" or "Lowe's" and pick up a piece of 4' x 6" Sonotube cut it in half for 2' lengths... place them in heavy duty trash bags inside your holes allowing 4" to 6" above ground level. Soak or brush your post with creosote, place in hole and pour concrete. I'd bury some slab wire mesh reinforcement and put a wire mesh roof on it if Coyotes are a problem. But its a chicken coop not a bridge abutment...
Phil
Actually, all the OP ever asked was if concrete would set in a wet hole.
I think he has the rest his schit together and knows exactly what he is gonna do..
