Do you clean poop out of the coop in a separate manner? I have 9 chickens, and I can fill a 5 gallon bucket with poop from their poop board in about 2 weeks. Chickens poop A LOT.
I use deep bedding in my coop. The chicken poo automagically disappears into the litter. My goal is to clean out the coop once in the spring after the snow melts, and a second time late in the fall so I can put in fresh litter in the coop for the winter. With the deep bedding I use, I could probably get by with cleaning it out only once a year, or less, if I just go by the smell. My dry deep litter method in the coop is basically smell free, so I assume it is doing good. All my coop deep litter gets dumped into the chicken run when I clean out the coop and put in fresh litter.
Years ago, I used straw, but that quickly gets wet and moldy, and I was always cleaning everything. It smelled a lot. When I got my laying hens, I switched over to using deep bedding with wood chips. Worked great for the first two years. This year I am experimenting with using paper shreds I make at home instead of using wood chips. The idea is that the paper shreds will compost faster than wood chips when I clean the coop and dump the shreds into the chicken run compost system to start composting.
So far, the paper shreds have been working great, again, no smell and the chicken poo automagically disappears into the paper shreds litter. I dump a fresh bag of paper shreds into the coop about every 2-3 weeks. The chickens fluff up the shreds enough that I have not had to do any interim cleaning.
Chickens poo a lot, but the only accumulation I ever get is under the roosts. Most of the poo disappears into the litter. If I see an accumulation of poo that needs attention, I will sometimes throw some chicken scratch over that area and the chickens themselves with scratch and peck for the treats, which turns over the litter, and takes care of the problem. Mostly, in the winter, I just dump more litter on top the old because frozen chicken poo is like cement and there is really nothing to be done with it until spring. I usually start off with about 3 inches of litter in the late fall and end up with about 12 inches of coop litter in the spring before cleaning. But I designed my coop for that method and it works great for me. Again, no smell which is the way I determine what, if any, corrective action needs to be taken.
I imagine freezing winter temps may help eliminate some harmful organisms also, so perhaps it's not so bad to apply in late Fall or early Winter. I've honestly not done much research on that bit. My biggest concerns though would be E. Coli and various parasitic worms.
Honestly, I have never been concerned about E. Coli and/or parasitic worms. I guess I assumed the chicken run compost was safe to use if left in the garden over winter. I have only used aged compost for planting, and it seems to work for me.
I did a quick Google search and found out that E. Coli suspends dividing/growing at 32F (Freezing temp),, but will start to replicate again when it gets warmer. At 0F, E. Ecoli starts to die. Well, in northern Minnesota where I live, we typically get as low at -40F in the dead of winter. I cannot imagine any of my surface compost not being safe to use after our winters.