Winter is the dangerous season for a pet hedgehog kept at home, not because houses are arctic but because they fluctuate. Heating runs warm in the evening, switches off overnight, and leaves the coldest hours of the night exactly when a nocturnal hedgehog is awake, eating, and running on her wheel. A room that feels comfortable to people in sweaters can still let an enclosure drift low enough, for long enough, to put her at real risk.
Steady Warmth, Day and Night
The enclosure holds steadily in the low-to-mid seventies Fahrenheit, about 72 to 79 °F, day and night, verified on a thermometer inside the cage. That inside-the-cage detail matters: the hallway thermostat reports the warmest corridor in the house, while her enclosure may sit against an outside wall, near a window, or low on a floor where cold air pools. Place the thermometer probe at her level, near her sleeping area but not touching any heat source, and read it morning and evening through winter so a slow drift shows up as a pattern rather than a crisis. A heat source on a thermostat suits most homes, set to hold her range while the house heating cycles around it.
Steady warmth day and night through winter means planning for the gaps: overnight setbacks on the house heating, a cold snap while you are at work, and a power cut. Know which room in your home holds heat longest and move her there for the coldest weeks if her usual room swings widely. Keep her enclosure away from radiators as well as windows, since direct heat followed by sudden cooling stresses her system in the other direction. Check her belly gently during handling: a warm belly and an active, hungry hedgehog at night tell you the system is working.
Light Is the Second Half of the Picture
A steady light pattern matters alongside the warmth, because cold plus short dark days can push a pet hedgehog toward a dangerous hibernation attempt. Pet hedgehogs come from warm climates and are not built to hibernate; an attempt leaves them cold, depleted, and unable to rouse properly. Give her regular, predictable daytime light, roughly following a normal day, and real darkness at night while she is active, rather than a room lit brightly until midnight and dark until noon. If her room gets little natural winter light, a normal room light on a timer near her enclosure keeps the pattern honest without any special equipment.
Treat the two halves as one system. A hedgehog in a warm enclosure under chaotic short days may still slow down, eat less, and wobble, and a hedgehog under good light in a cold cage is in more danger, not less. When owners describe a hedgehog who went quiet in midwinter, the history usually shows both slipping together as the season darkened and the house cooled at night. Logging light and temperature together, even in a notebook on top of the cage, makes that drift visible in a way memory never does.
If You Find Her Cold
A cold, curled, unresponsive hedgehog is warmed gently and gradually and the vet is called; do not use hot water, a hair dryer, or a radiator blast, because rapid heating shocks a cold body. Warm her against your own body under a fleece, or on a warm (not hot) covered heat pad, and let her uncurl and stir in her own time while you phone your vet for guidance. A hedgehog who rouses, warms, and eats still deserves that vet conversation, because an attempt often signals that the enclosure has been running cold for days. Afterward, fix the system, not just the night: recheck the thermometer position, the thermostat setting, and where the enclosure sits. Families sharing winter checks can split the readings in KinsLe through Family Sharing, with one person logging the morning temperature and another adding the evening figure to the same shared record.