Seasonal Pet Care: Heat and Cold Limits for Small Pets, Reptiles and Birds

This is the year-round reference: the temperatures each common small pet, reptile and bird tolerates, and which season puts each one at most risk. For the detail on hot weather, see summer pet care; for cold snaps, outdoor hutches and power cuts, see winter pet care.

Heat and cold thresholds by species

Species	Target range	Cold limit	Heat limit	Main risk by season
Rabbit	50–68°F (10–20°C) (RSPCA)	Near freezing: move the hutch indoors or into a shed (RSPCA)	Heatstroke once body temperature passes 104.9°F (40.5°C); rabbits don’t pant or sweat (PDSA)	Spring/summer: flystrike and heatstroke. Winter: wet bedding, frozen water
Guinea pig	63–68°F (17–20°C) (RSPCA)	Below 59°F (15°C): chilled; bring indoors (RSPCA)	Above 79°F (26°C): heatstroke (RSPCA)	Summer: heatstroke. Autumn: cold nights outdoors
Chinchilla	50–64°F (10–18°C) (RSPCA)	Draughts and damp (RSPCA)	Above 65–80°F (18.3–26.7°C), worse with humidity; °F + %RH over 150 is dangerous (MSD)	Summer: heatstroke, matted fur in warm humid air (MSD)
Hamster	64–79°F (18–26°C) (Merck)	Cold triggers torpor; domestic hamsters lack the fat reserves to survive it for long (RSPCA)	Keep below the top of the range, 79°F (26°C) (Merck), and out of bright sunlight (RSPCA)	Winter: torpor in cold rooms. Indoors only (RSPCA)
African pygmy hedgehog	75–85°F (24–29°C); 72–90°F (22–32°C) acceptable (Merck)	Torpor below 68°F (20°C), an attempted hibernation that may lower resistance to infection (Merck)	Very high heat can also cause torpor (Merck)	Autumn/winter: heating off overnight, power cuts
Reptiles	Species-specific, e.g. corn snake 77–86°F (25–30°C), bearded dragon 77–90°F (25–32°C), basking about 9°F (5°C) warmer (Merck)	Glass tanks lose heat fast (Merck)	Tanks in sun overheat (RSPCA)	Winter: heater failure. Summer: sunlit vivaria
Pet birds	Indoors, away from radiators and draughts (RSPCA)	At risk below 50°F (10°C) (RSPCA)	Shade needed; no published threshold found	Winter: cold, dry air, non-stick pan fumes (RSPCA)

Use a thermometer at the animal’s level, not the thermostat in the hall. Rabbits, guinea pigs and chinchillas have overlapping but different ranges; a chinchilla is in danger at temperatures a hedgehog needs.

Spring and summer: what outdoor rabbits need

• Flystrike checks. Blowfly maggots can eat into a rabbit’s flesh within 24 hours. Check the rear end every day, and at least twice a day in summer; any rabbit with a dirty bottom is at very high risk (RWAF). Flystrike is also common just above the tail. Fly-repellent products don’t replace checks (RWAF).
• Toxic garden plants. Ivy, rhubarb and foxglove are among the commonest serious rabbit poisons; lilies, clematis, rhododendron and lily of the valley have also poisoned rabbits. Keep runs free of these and not overhung by them (RSPCA).
• Shade and cooling. Keep hutches and runs out of direct sun, give extra water, and offer a semi-frozen water bottle wrapped in a towel to lie against (RSPCA).
• No glass buildings. When it is 72°F (22°C) outside, conservatories, outbuildings, caravans and cars can reach 117°F (47°C) (RSPCA).

Heatstroke first aid is species-specific

Species	Do	Don’t
Rabbit	Move to shade; wet the ears with cold tap water, then slowly soak the body, away from nose and mouth; sit on a cold wet towel; drive to the vet with someone wetting the ears (PDSA)	Cuddle it or cover it with a wet towel; that traps heat (PDSA)
Guinea pig and other rodents	Move to a cool, shaded place, wrap in a cool damp towel, phone the vet (RSPCA)	Leave it in a hot hutch “to see”
Chinchilla	Move to a cool, dry room and call the vet	Wet it. Chinchillas become ill in wet or humid conditions (RSPCA), and damp fur mats (MSD)
Parrots and other pet birds	Shade and gentle misting with cool water (RSPCA)	Leave the cage in a sunny window

Rabbit signs to know: hot red ears, fast shallow breathing, open-mouth breathing, lethargy, wobbliness, seizures and collapse (PDSA).

Autumn and winter: housing changes

Outdoor rabbits (RSPCA):

1. Raise the hutch at least 4 in (10 cm) off the ground to stop damp and frost rising.
2. Insulate the walls with cardboard, blankets or insulation board, and cover most of the shelter at night, leaving a gap for ventilation.
3. Bed on dust-free hay and straw over newspaper; remove wet bedding daily, because it freezes overnight.
4. Check water at least twice a day; keep a spare bottle indoors and add a bowl, which freezes more slowly than a bottle.
5. Never feed frozen or frosty greens.
6. A shed or unused garage is fine; a garage with a car in use is not, because exhaust fumes harm rabbits.

Guinea pigs come indoors below 59°F (15°C) (RSPCA). Hedgehogs need their heat kept on overnight; a cold, limp, unresponsive hedgehog should be treated as torpid, not dead, and warmed under veterinary guidance (Merck). Read the hedgehog and rabbit pages for full setups.

Mistakes that cause seasonal emergencies

• Treating chinchillas like rabbits. Wetting a chinchilla to cool it, or keeping one in a humid room above 80°F (26.7°C), risks heatstroke and matted fur (MSD; RSPCA). See the chinchilla page.
• Leaving guinea pigs out through autumn. Nights below 59°F (15°C) chill them, and big swings when moving them in and out cause problems too (RSPCA).
• Letting the hedgehog heater cycle off at night. Torpor can start below 68°F (20°C) (Merck).
• Skipping the summer bottom check. Hours, not days, separate egg-laying from tissue damage (RWAF).
• Cooking with non-stick pans near a bird in winter, when windows are shut (RSPCA).

Avoid: hot rocks for reptiles (Merck), cages beside radiators, and wet bedding left in outdoor hutches.