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How cold is too cold for chickens? No extension source gives one number. Two of the three below name a temperature for frostbite risk, about 10°F in one and “single digits” in the other. The third gives no number and says wind and moisture are the problem. This page puts the three side by side, with what each one says and what it leaves out.
Short answer
No single cutofftwo sources point to the 10°F range for frostbite risk in combs
Oregon State Extension says comb tips can freeze at about 10°F. eXtension says frostbite can become a problem in single digits and below. Ohioline gives no number. All three tie the risk to damp air, drafts and large combs, so check the coop’s moisture before you check the thermometer.
What each extension source says about cold
| Source | Temperature given | What it says about the cause | Prevention it names |
|---|---|---|---|
| Small and Backyard Poultry (eXtension) | “Extremely low temperatures (single digits and below)” | Frostbite is more likely at night in a cold, poorly ventilated coop with damp bedding | Dry bedding, ventilation, a deep litter system and an in-bucket water warmer |
| Oregon State University Extension | “Comb tips can freeze at about 10°F” | Cold snaps hurt combs and feet; it says to give birds a dry, draft-free place out of wind, rain and snow | A dry, draft-free shelter; unfrozen water |
| Ohioline, Ohio State (ANR-66) | None. It says most breeds tolerate cold, “even sub-freezing temperatures” | Trouble comes when wind and moisture are added to cold; humid air creates more frostbite risk than drier air | Block drafts, keep ventilation, deep bedding, roost space and snow removed from the run |
Oregon State’s page was last updated in December 2025 and the Ohioline fact sheet is dated December 19, 2018. The eXtension article shows no date. Last checked October 18, 2026.
Where the sources agree and where they differ
They agree that moisture matters. eXtension names damp bedding and poor ventilation. Ohioline says a poorly ventilated, humid coop predisposes birds to frostbite. Oregon State asks for a dry, draft-free place.
They differ in how they frame temperature. Oregon State gives a plain figure for comb tips, about 10°F. eXtension says “single digits and below,” which is close to that figure but is worded as when frostbite becomes a problem in a well-run coop. Ohioline avoids a figure and talks about wind and moisture. None of them gives a temperature for hens with small combs, and none gives a temperature at which a healthy, acclimated flock needs a heater. I am not adding a threshold they do not state.
The only thing they give for heat is a set of conditions. Ohioline says cold-tolerant breeds that are acclimated, in an insulated, dry coop with adequate ventilation, do not usually need supplemental heat. eXtension says deep litter and a water warmer can be enough, even below zero.
Which birds are most at risk
eXtension says frostbite is most common in roosters, because they usually have larger combs and wattles, and that any hen with a large comb, such as a Leghorn, can be vulnerable. It says pea and strawberry combs see much less frostbite. Ohioline says a large comb or wattle, or a rooster of most breeds, can develop frostbite even in a cold-tolerant breed. It lists breeds it calls noted for cold hardiness, including Buff Orpingtons, Plymouth Rocks, Rhode Island Reds and Wyandottes.
Ohioline’s other frostbite steps are practical: remove snow from the run, make sure every bird can roost off the floor at night, and give at least 6 to 8 inches of roost space per chicken. It says roosts should be 1½ to 3 inches in diameter.
What to do about frostbite
eXtension’s advice is to warm affected areas slowly and not use direct heat such as a hair dryer or heat lamp. It says not to rub or massage the area and not to trim blackened tissue unless it becomes infected, because the dead tissue protects what is underneath. Healing can take four to six weeks, it says, and egg production and fertility can drop in extreme cold even without visible frostbite. Ohioline says to use warm, not hot, foot soaks and not on the comb or wattle, and to contact a veterinarian if you suspect infection.
When to call a vet
Swelling, increased redness, discharge or a bad odor on a frostbitten area can mean infection. Both eXtension and Ohioline say to watch for these signs, and Ohioline says to contact a veterinarian if you suspect infection.
What to check in your own coop
- Look for condensation on windows or walls in the morning. eXtension says that means ventilation must be increased to keep the coop dry. The ventilation guide covers vent area.
- Keep bedding dry and top it up. eXtension says the extra layer also helps insulate, and the insulation guide covers walls and ceilings.
- Check water at night and again in the morning. Both Oregon State and Ohioline raise frozen water. See heated chicken waterers.
- Decide on heat last. The heating guide compares what two other extension services say, and it explains why a heat lamp is the riskiest choice.
This page is part of the winter coop guide. The sources above are the three read for this page. Other extension services may give different numbers, and the heating guide covers one that does.
Questions people ask
How cold is too cold for chickens?
No extension source here gives one number that is too cold for every flock. Oregon State Extension says comb tips can freeze at about 10°F. The Small and Backyard Poultry site (eXtension) says frostbite can become a problem in single digits and below. Ohioline says most breeds tolerate even sub-freezing temperatures, and that wind and moisture are what cause trouble.
At what temperature do chickens get frostbite?
Oregon State Extension says comb tips can freeze at about 10°F. eXtension says frostbite is more likely at night in a cold, poorly ventilated coop with damp bedding, and becomes a problem in single digits and below. Ohioline says humid air creates more frostbite risk than drier air.
Do chickens need a heater when it is below freezing?
Ohioline says acclimated, cold-tolerant breeds in an insulated, dry coop with enough ventilation do not usually need supplemental heat. eXtension says flocks can do well at sub-zero temperatures with a deep litter system and an in-bucket water warmer, with no external heat. See heating a chicken coop for the extension split on heat.
Which chickens get frostbite most easily?
eXtension says frostbite is most common in roosters because they usually have larger combs and wattles, and that any hen with a large comb, such as a Leghorn, can be vulnerable. It says birds with smaller comb types, such as pea and strawberry, have much less frostbite. Ohioline makes the same point about large combs and wattles.
What should I do if a chicken gets frostbite?
eXtension says to warm the affected area slowly, with no hair dryer or heat lamp, and not to rub it. It says not to trim blackened areas unless they become infected, and that healing can take four to six weeks. Call a veterinarian if you see swelling, discharge or a bad odor.
Sources
Written by Kyle
Kyle has kept backyard chickens on his own small farm for five years. He reads the extension research, the spec sheets and the owner complaints, then tells you what he would buy and what he would skip.
