If you get a day in late winter or spring when it's dry enough, consider dusting the base of pop doors and other entrances with some food-grade diatomaceous earth (DE). Do the same with the ends of roosts and the bottoms of nest boxes. Think like the insects and eight-legged pests, especially the tiny ones. Without stirring up a cloud of dust, lace the nooks and crannies where lice and ticks could enter, or ants. . If you have a covered run or if it is dry enough, coat the perimeter, even up on the wire a short distance above the soil. Pay attention to thresholds inside and out, eggs can be stored and adults can hibernate in the most benign places. This may give you a head start before warmth and moisture make prevention a difficult procedure. DE is not an instant killer of insects or arachnids, rather it sets up a situation where the eggs or adults are compromised by the microscopic edges of the diatoms and will die off usually within 12 hours. It's also a good time to buy no-pest strips to hang when it's warmer and a time to check the run, rake and treat with Stable Boy or other stall treatments that are safe for poultry, This will neutralize the soil and prevent bacterial from monopolizing the situation when it gets warmer. Head start for those of us up north!