What is the Minimum Number of Chickens I can keep?

Chickens are social creatures used to living in small flocks and they will not thrive if they are living alone. Most people will keep a minimum of 3 chickens rather than 2 so that if anything happened to one, they still have a pair in the flock. This is important because introducing new chickens, especially birds of different ages can be so traumatic until the pecking order is re-established. Remember that if you have a small run for your chickens, you can still let them out to give them some free range time whilst you're around.

Keeping one hen on her own is very unfair and I would consider getting her some company as soon as you can.