LoneCowboy: I feel your pain about the lunacy that is Boulder County.
Living on the eastern plains we have many foxes aruond. I once trapped one live and dispatched it. I felt bad about doing it realizing that another one would fill the void.
I would suggest using a product called Shake Away. It is made from coyote urine. If you have foxes around chances are you don't have coyotes around. They eat foxes.
We have used this and it does work. However doing everything you can to make sure they can't get to your chickens is your best bet.
Hope this helps.
P.S. Keep warm !!!
Living on the eastern plains we have many foxes aruond. I once trapped one live and dispatched it. I felt bad about doing it realizing that another one would fill the void.
I would suggest using a product called Shake Away. It is made from coyote urine. If you have foxes around chances are you don't have coyotes around. They eat foxes.
We have used this and it does work. However doing everything you can to make sure they can't get to your chickens is your best bet.
Hope this helps.

P.S. Keep warm !!!