No: a Campbell's body is not built for outdoor weather
A Campbell's dwarf hamster cannot live outdoors all year round in a hutch or run, because its tiny body loses and gains heat far faster than an outdoor setup can buffer. In cold weather a Campbell's can slip into a dangerous torpor-like state in conditions a hardier animal would merely find chilly, and damp cold is worse again, chilling a small mammal that cannot dry its own soaked bedding. At the other extreme, a hutch warming in sun can overheat a hamster that has no way to escape the hot end of a small box. Indoor rooms hold the steady, moderate temperature this species evolved to burrow away from extremes to find.
A hutch and run fail a dwarf hamster in other ways too
Even in a mild spell, a hutch is the wrong architecture for a Campbell's dwarf hamster. Hutches are ventilated with mesh a Campbell's could be dragged against by a cat's paw or terrified through nightly by rats and foxes it can smell but never escape. A run on grass exposes the hamster to soil parasites, pesticide-treated lawns, wild rodent droppings, and sudden rain that floods a burrower at ground level. Hamsters also chew relentlessly, and wooden hutch corners and plastic run parts that contain a rabbit will not hold a determined dwarf hamster for long. An escape outdoors is effectively unrecoverable for an animal this small.
What the Campbell's gets indoors that outdoors cannot give
Kept indoors, a Campbell's dwarf hamster gets the controlled version of everything it would seek outside: deep bedding it can tunnel through without the tunnels flooding, a stable day-night light pattern that keeps its nocturnal rhythm regular, and air that stays dry and draught-free. A glass enclosure or barred cage with narrow spacing, placed away from radiators and sunny windows, reproduces the sheltered burrow conditions this steppe species is adapted to. Room temperature that feels comfortable to a person in light clothing is roughly the band a Campbell's thrives in, which makes a spare room or quiet bedroom corner an easy, humane habitat.
If the hamster has been kept outside, bring it in properly
A Campbell's dwarf hamster that has been living in a shed or hutch should be moved indoors promptly rather than gradually acclimatised, because there is no safe acclimatisation to seasons it cannot handle. Set up the indoor enclosure first with bedding from the old cage mixed in, so the smells are familiar, then move the hamster in its hide during the day while it sleeps. Watch appetite, activity at night, and droppings over the following days; a hamster that stays hunched, stops eating, or feels cold to the touch after coming in from the cold needs a small-mammal vet quickly, since chilling can leave lasting harm.
Making indoor keeping a shared, reliable routine
The real care question for a Campbell's dwarf hamster is not outdoor housing but consistency indoors: fresh water daily, food scattered or bowl-fed on schedule, spot-cleaning that does not wreck its burrows, and a weekly check of the wheel, lid, and bar spacing. Those small jobs are easy to drop in a busy household, and a hamster cannot remind anyone. Writing them down and sharing them beats relying on one person's memory, especially during holidays when a neighbour may be feeding. KinsLe's Care Teams lets you assign your Campbell's feeding, water, and enclosure checks to family or helpers with each finished task timestamped, so its indoor routine holds steady all year.