This weekend there are supposed to be 3 or 4 days where the temperature doesn't get above 10 degrees with the overnight temperatures well below zero. I don't know what the windchill will do to the temperature.
Here are a few things I do to help my hens.
1. Make sure there is always plenty of fresh water! I use a heated dog bowl which is quite big so if for any reason I can't get there right away they will have enough water.
2. I make sure they have really deep shavings. I actually use an entire bag of shavings per coop.
3. Today I put 1 heat lamp (on a timer) in each coop so overnight when it gets dangerously cold they have a place to perch and keep warm.
4. I added a little extra cracked corn and gamebird feed to their food mix. The gamebird feed is higher in protein and the cracked corn I understand takes some work to digest so keeps their body temp up.
5. I put vaseline on all combs to protect against frost bite.
6. I check them often.
7. Helpful link
photo by bytegirl2