Disclaimer: These are my opinions and do not represent the official view of this forum.  
	
		
	
	
		
		
			16% protein is a bare minimum. It's not enough for molting chickens, as feathers are made of protein so they need more.
		
		
	 
This is one place I disagree with a lot of people on here, including people I respect.  When hens molt they typically stop laying eggs.  Many lay 5 or 6 eggs a week.  Eggs contain a lot of protein, about 5 to 7 grams each, depending on size.  Since they are not laying they have extra protein to use to grow feathers.  
The speed of a molt is controlled by how fast the feathers fall out, not how fast they grow back in once they fall out.  That is controlled by genetics.  Feeding them extra protein is not going to make the feathers fall out any faster.  
I do not personally see any benefit regarding the molt in feeding them higher levels of protein than they normally get.  Breeders that raise show chickens do feed a high level of protein.  The judges reward them for big chickens and more protein means bigger chickens.  There could be a benefit in how pretty the feathers look with a lot of protein but some that raise show chickens drizzle a little oil on the feed to get shinier prettier feathers.  I don't raise show chickens so I don't worry about things like that.  I was probably spoiled by growing up with chickens that pretty much fed themselves except when there was snow on the ground.  I understand in Minnesota you get a lot of snow and you do need to feed them.  
I've seen chickens sleep in trees in temperatures as low as -10 Fahrenheit, with no issues.  Those trees were in an area protected from winds.  You cannot get better ventilation than sleeping in a tree.  The vast majority of us do not have the ability to let the chickens roam and live like that.  I sure do not.  The way we house them can put them at higher risk, either from lack of ventilation or us letting a cold breeze hit them.  On their own they are extremely good at managing these things but sometimes we limit their options.
To me, my chickens are not pets or members of the family.  I think of them as chickens and try to give them a good life for chickens.  That includes decent food, clean water, protection from predators, and protection from the elements.  I try to let them act like chickens.  I understand I am different to a lot of members of this forum.  
Your chickens are used to 16% protein feed.  I would expect them to do fine on that.  If your chickens were used to 20% or22% protein feed I'd suggest you maintain that.  Their bodies have probably gotten used to that and may now need it.  
	
		
	
	
		
		
			she’s finished her molt, now she’s very energetic and eating well. how can i help my other hens with their molt? they just look so sad and huddled up. how do i know if they’re just molting or they’re sick?
		
		
	 
The one you were so worried about is now fine.  Now the other two are molting and you are worried about them.  It is late for a molt, I'm not sure why they are so late.  How do you know they are molting?  Are you seeing feathers that have fallen out?  Bare spots not attributed to some other cause?  
Across the internet I can't tell if they are sick or molting.  Are they eating and drinking well?  Are they spending all day in one spot fluffed up and looking miserable?  If they are eating and drinking OK and moving around some they are probably OK but I can't give guarantees.
Good luck!