Winterizing a chicken run and coop sounds like something that should involve snow boots, a shovel, heated waterers, and perhaps a heroic amount of straw. And if you live in Minnesota, Maine, Montana, or somewhere else where winter arrives with an attitude, it probably does.
But if you live in Northern California like I do, winterizing the chicken run looks a little different.
We don’t spend the winter digging chickens out of snowdrifts. Our bigger concerns are rain, mud, wind, drainage, and those stretches of wet weather when everything outside seems determined to stay damp.
And this year, I’m paying particular attention to the weather forecast. El Niño is strengthening, and NOAA/National Weather Service guidance gives a greater than 79% chance of a very strong El Niño during the Northern Hemisphere fall and winter of 2026–27.
El Niño often increases winter precipitation across the southern tier of the United States, but Northern California’s response is considerably less predictable. In other words, I’m not betting the chicken feed on exactly how much rain we’re going to get—but I’m absolutely going to make sure the run is ready for it.
The goal isn’t to make winter disappear. It’s to make sure the chickens have a dry, secure, well-ventilated place to spend it.
Table of Contents
- Preparing for a Wilder-Than-Usual Winter
- Keeping the Coop Dry
- Basic Preparation
- Start with the Roof
- Think About Drainage
- Give the Ground a Break
- Secure the Run for Wind
- Don’t Close Everything Up
- Don’t Forget the Chicken Run Perches
- Make a Winter Emergency Kit
- Cold Climates Need a Different Strategy
- Winterize for Your Climate, Not Someone Else’s
Preparing for a Wilder-Than-Usual Winter
The current 2026–27 El Niño forecast makes it reasonable to prepare for periods of heavier winter precipitation, particularly across parts of the southern tier of the country. But El Niño impacts vary considerably by location, and the National Weather Service notes that Northern California has a weaker and less consistent precipitation relationship with El Niño than Southern California. (source: National Weather Service: ENSO)
So I’m not preparing for a guaranteed deluge. I’m winterizing the chicken run for the possibility of more serious rain events than my run routinely sees.
That means checking:
- Roof panels and fasteners
- Runoff and drainage
- Low spots in and around the run
- Any areas that could get muddy (covered entrances are great!)
- Leaks, especially near nesting boxes or food areas
- Coop ventilation
- Waterer placement
- Areas where wind-driven rain can enter
- Hardware cloth and other predator barriers
- Gates, latches, and locks
- Cameras and any electronics, including smart sensors (or an automatic door)
Keeping the Coop Dry
I’ll start with the coop. After all, it is where the hens sleep at night, where they nest and lay eggs, and where they will retreat on particularly stormy days. The coop must be dry. The chicken run gets the attention because that’s where we would see the mud from any leaks or driving rain. But the coop itself matters even more.
Chickens can handle cold considerably better when they are dry. Persistent dampness creates a much less comfortable environment and contributes to wet litter, humidity, and ammonia problems.
I’ll address even the smallest leaks. This is especially important in the coop, over the roosts and nest boxes. A wet hen often leads to a sick hen. Wet bedding will be removed rather than simply covered with another layer. If you use deep bedding on the floor, monitor it rather than assuming more is always better. The goal is a dry, manageable bedding environment—not a compost pile with chickens living on top of it.
Good ventilation in the coop helps remove moisture and ammonia. Ventilation should be high up, in the eaves if possible. Monitor the roosts for drafts.
And if I smell ammonia when I open the coop, I’ll remediate that as soon as I can. Ammonia damages the delicate lining inside a chicken’s nasal passages and lungs, and can contribute to acute respiratory issues for your hens (and you). Ammonia can begin damaging respiratory tissue at concentrations much lower than we humans can smell.
Basic Run Preparation
Start With the Run’s Roof
No matter where you live, if your chicken run isn’t covered, winter is the time to think seriously about covering at least part of it.
A roof doesn’t have to turn the run into a chicken conservatory. Even a covered section gives the flock somewhere to get out of weather while still allowing them access to the outdoors.
For a wet winter, I want our roof to do more than keep rain off the chickens. I want it to keep the ground underneath them from becoming a mud pit. A good roof also protects feeders, keeps roosts, dirt bath areas, toys and bedding drier, and gives chickens an area where they can continue scratching and moving around when the weather isn’t cooperating.
If we expect significant rain, I’ll inspect the roof before the first major storms. I’ll look for leaks, gaps, loose panels, and places where water runs into the run. I do not want to discover a roof problem during a three-day rainstorm.
Think About Drainage Before Winter Arrives
Look at your run after a heavy rain. Where does the water go? Does it drain away from the run, or does it collect in one corner? Does water run off the roof and directly into the chicken yard? How about your entrances; do they become a mud puddle?
Fixing those problems before winter is much easier than trying to solve them while standing ankle-deep in chicken mud. If it is possible to add a covered entrance, now’s the time to do that. We added a small portico to our run entrance a couple of years ago and it is worth its weight in gold, especially when my hands are full, the chickens are trying to get out, and the skies are releasing a deluge, all at the same time.
If necessary, improve the grade around the run, redirect roof runoff, add appropriate drainage, or create a more durable surface in areas that receive heavy traffic. Consider adding an extra overhang or adding a planting area directly under to capture and/or disperse excess water.
- A simple overhang with corrugated metal sheets is simple to construct and works well for runoff (see photo below). We added ours 2 years ago and it works great!
- An inexpensive sail can be added to the roofline to help move more water away from the run. This is also great for sun and heat protection during the summer.
- Digging a trench under the eave and adding pea gravel or base rock will help prevent standing water. This is the same concept as a French Drain.
And remember that chickens are remarkably efficient at turning a small wet area into a much larger wet area.
Give the Ground a Break
A heavily used chicken run can become compacted surprisingly quickly. Our soil has a high clay content, so in high traffic areas it becomes super hard and smooth like smooth adobe or terracotta tiles.
Once winter rain arrives, this compacted clay soil has a harder time absorbing water, and areas around feeders, waterers, doors, and any low spots can become particularly messy.
A layer of appropriate bedding or ground material can help manage the surface. But I don’t ever pile material onto a saturated, poorly drained area. The underlying drainage still matters. Once a year I have to break up the compacted soil in a few places before the rains arrive to ensure proper drainage. It also gives me a chance to level out any high or low areas.
This is also a good time to inspect the area around the coop itself. We have gophers that through the summer like to reconstruct soil along edges such as the perimeter of the run. If any water is collecting in soil mounds near or against the structure, I’ll fix that before the rainy season gets serious.
Secure the Run for Wind
Rain isn’t the only concern during winter storms. Strong winds can loosen roofing, damage fencing, blow branches into the run, and create gaps that weren’t there yesterday.
Before winter, I want to inspect the entire run from top to bottom. I’ll check the frame and make sure the hardware cloth is firmly attached. Because we use 1/2-inch hardware cloth, I pay particular attention to the attachment points. The hardware cloth itself is only as useful as the structure holding it in place.
Check every latch. A strong storm is an excellent way to discover that the latch you thought was secure hasn’t actually been secure since last winter. And if Larry the bantam rooster is reading this, no, this does not mean you have permission to escape into the garden.
Also look above the run. Are there large branches hanging over it? If so, winter is an excellent time to address them before a storm does it for you.
Don’t Close Everything Up
One of the biggest mistakes people can make when winterizing your chicken run is confusing warmth with good housing. Chickens need protection from wind, rain, and extreme cold, but they also need ventilation.
Ventilation removes moisture, ammonia, and stale air. Excess humidity combined with cold temperatures can contribute to condensation (and frostbite in colder areas). Extension guidance specifically emphasizes maintaining ventilation while avoiding drafts directly on roosting birds.
So I don’t wrap the entire chicken run in plastic or insulation and seal it up like a greenhouse. That’s not winterizing. That’s building a chicken sauna.
Instead, I try to protect the areas where the flock needs shelter, while maintaining appropriate airflow. Ventilation openings should generally be higher than the birds so incoming air can mix with warmer air rather than blowing directly across the flock.
In our run, we can add corrugated metal panels that are cut to the exact height of the run. We can slot these in place when harsh weather (such as sideways rain) necessitates it. Importantly, we can add them on only one side of the run, where the wind and rain is coming from. Or, we can add several sides as needed, still maintaining gaps at the top for air.
And when the sun returns, we can remove them quickly and easily to allow airflow and increased sunlight.
In warmer climates, don’t over-winterize. My winter preparation focuses on flexibility. We may have winter days that are 65°F, followed by a chilly night, followed by a week of rain, followed by a warm sunny afternoon.
I want the run to dry quickly after a storm. I also want enough ventilation that a warm, sunny winter afternoon doesn’t turn the covered run into a humid box. Poultry heat stress can occur surprisingly quickly when temperatures and humidity rise, and ventilation is one of the primary tools for helping birds dissipate heat.
So whatever winter modifications you make, make sure they are flexible and can be opened, removed, or adjusted easily as conditions change.
Don’t Forget the Chicken Run Perch
Winter is also a good time to look at the run perch.
A run perch gives chickens somewhere to get off wet ground and provides another place for them to observe what’s happening around them. It doesn’t need to be fancy. And it doesn’t need to be very high off the ground.
A sturdy branch or properly secured wooden perch can work. I’ll check to make sure they are all stable, safe, and positioned where it won’t become a hazard during high winds or heavy rain.
Make a Winter Emergency Kit
A small coop-repair emergency kit can save a lot of scrambling during bad weather. Keep supplies somewhere dry and accessible:
- Extra bedding
- Extra feed
- A backup waterer
- Flashlight or headlamp
- Spare hardware cloth and fasteners
- Basic tools
- Towels
- A safe temporary crate or carrier
- First-aid supplies
- Backup power options where appropriate
If a storm knocks out power, damages part of the run, or makes our normal routine impossible for a day or two, I’ll be glad to have everything in one place.
Cold Climates Need a Different Strategy
If you live somewhere that regularly experiences freezing temperatures, snow, and ice, winterizing your chicken run will need to go considerably further than mine.
In genuinely cold climates, water can freeze quickly, so you may need a heated poultry waterer or another safe method of preventing freezing. Keep electrical equipment and cords away from water, bedding, and anything chickens can peck or knock over.
The important point is that cold and wet are not the same problem. A dry chicken with appropriate shelter can handle cold weather much better than a chicken sitting in a damp, poorly ventilated environment.
Make sure the coop is protected from drafts while maintaining ventilation. Provide adequate roosting space so birds can get off the cold floor and perch together. Wooden roosts are preferable to materials that become extremely cold.
And pay attention to individual birds. Smaller breeds, birds with large combs and wattles, older birds, and birds in poor condition may require more attention during extreme cold.
Winterize for Your Climate, Not Someone Else’s
This is probably the most important lesson. Someone in Maine has very different winter chicken priorities than someone in Northern California. In a cold northern climate, you’re thinking about freezing water, frostbite, snow, ice, extreme cold, and protecting birds from drafts.
In Zone 9B, I’m thinking about rain, mud, drainage, ventilation, and those wonderfully unpredictable winter temperature swings. And this year, with El Niño strengthening, I’m adding storm prep to the list.
But I’m not sealing up the coop. I’m not turning the run into a bunker. And I’m definitely not putting sweaters on the chickens. The goal is much simpler: keep them dry, secure, well ventilated, and comfortable while giving them access to the outdoors whenever conditions allow.
Because winterizing a chicken run isn’t about making winter disappear. It’s about making sure that when the rain starts, or the wind picks up, I can look out at the flock and think, yep. We’re ready.
