I have not seen a solid number regarding square foot minimums for coops and runs. My backyard chicks will not be able to run free most of the time. I have a space that is 4x19 feet to devote to their home. I've seen recommendations of 2-10 sq ft (per hen) for the coop and 4-10 sq ft (per hen) for the run. I live in a mild climate. Lows year round range from around 40-50, and highs range from 50-70. It's rainy here: 64 inches/year. My run will be protected from the wind, against a garage wall. Here is what I'm thinking: 6 hens Coop: 4x5 feet = 3.33 sq ft per hen Covered Run (open on one end and the front): 4x14 feet = 9.3 sq ft per hen Looking for wisdom from you, my chicken friends. Thanks!