Moving a pet in the winter months raises a different set of risks than a summer move, and the airline industry treats the two seasons very differently. Where a hot-weather move is mostly about heat stroke risk during ground handling, a cold-weather move is about outright refusal: airlines will simply decline to check a pet into cargo once temperatures fall past a defined threshold, regardless of how healthy or well-prepared the animal is. If you are planning a move between roughly November and February, understanding these embargo rules before you book anything will save you a canceled reservation on moving day itself.
Cold-weather embargoes: the actual thresholds
Airlines that accept pets in cargo generally set a standard acceptable range and then cut off service entirely below a hard floor. American Airlines Cargo and Alaska Airlines both require ground temperature at departure and arrival to fall roughly between 45 and 85 degrees Fahrenheit for a routine pet cargo booking, the same window that governs the hot-weather side of the rule. Below about 20 degrees Fahrenheit, most airlines will not check a pet into cargo under any circumstance, acclimation certificate or not; that floor exists because extreme cold poses a real risk during tarmac handling regardless of how the animal is bred or how long it has lived somewhere cold. The IATA Live Animals Regulations that most international and many domestic carriers reference set the underlying framework airlines build their own specific thresholds from.
Between the 45-degree standard cutoff and the roughly 20-degree hard floor sits a middle zone where a veterinarian-issued acclimation certificate can sometimes unlock an exception. Alaska Airlines is one of the carriers that may accept a pet down to around 20 degrees with a completed certificate of acclimation, generally reserved for breeds with heavier coats that a vet can document as genuinely cold-hardy. This is airline-specific and not something to assume applies universally, so confirm the exact policy and paperwork requirement directly with your airline before relying on it.
Quick reference: winter cargo temperature bands
| Temperature range | Typical airline response |
|---|---|
| Above 85 F | Subject to the separate summer heat embargo instead |
| 45 F to 85 F | Standard acceptable range, routine booking |
| 20 F to 45 F | May require a veterinarian acclimation certificate, airline-specific |
| Below 20 F | Most airlines refuse cargo booking regardless of paperwork |
Airlines check both ends of the trip, and layovers count
The same rule that applies to summer travel applies here in reverse: airlines check forecast temperatures at both the origin and the destination airport, and on a connecting itinerary, at any layover city where the pet will sit on the tarmac during a plane change. A perfectly mild departure city does not protect a booking if the destination or a connection point is forecast well below the airline's floor that day. This is one of the most common reasons a booked winter pet flight gets pulled at the last minute, and it is worth checking the forecast for every leg of the itinerary, not just your home airport, in the days leading up to travel.
The acclimation certificate: what it actually requires
An acclimation certificate is a document a licensed veterinarian signs stating that a specific animal has been kept in conditions that make it reasonably tolerant of colder temperatures than the airline's default cutoff. It is not a form you fill out yourself, and it does not apply broadly to any pet; it is issued per animal, typically within a short window before travel, and airlines that accept it will specify their own expiration timing and exact wording requirements. See the pet transport document checklist for how an acclimation certificate fits alongside the standard health certificate, rabies proof, and vaccination records every winter shipment still needs regardless of temperature.
Health certificates and standard paperwork still apply
Cold weather adds an extra document requirement on top of, not instead of, the paperwork every pet shipment needs. A valid USDA-endorsed health certificate, current rabies vaccination proof, and a legible, secured crate label are still required in winter exactly as they are the rest of the year. Do not let the seasonal embargo become the only thing you are tracking; a winter booking can still fail on ordinary paperwork grounds even if the temperature window is fine.
Snow, ice, and road conditions add a separate winter risk of their own
Even once the temperature-embargo question is settled, winter travel introduces road and flight delay risk that has nothing to do with a pet-specific rule. A snowstorm can delay a connecting flight enough that a pet ends up sitting in an airport cargo area for hours longer than planned, and icy roads can slow a ground transporter's route in ways that push back an otherwise reliable delivery window. Build extra schedule buffer into a winter pet move on both fronts, air and ground, rather than assuming a booked itinerary will run exactly on time the way it might in a milder season.
The PetMD cold-weather safety guidance is a useful general reference for how cold exposure affects dogs and cats physically, useful context even outside the airline-specific embargo rules covered here, particularly for understanding why puppies, kittens, senior pets, and short-coated breeds carry extra risk in genuinely cold conditions regardless of which transport method is used.
Why ground transport is often the more reliable winter choice
A climate-controlled ground pet transporter is not subject to an airline's cargo temperature embargo at all, because the animal never sits unsupervised on a tarmac or in an unheated cargo hold. The vehicle's interior temperature is actively managed and monitored by a handler for the entire trip, which sidesteps the entire category of risk the airline embargo rules exist to manage. For a winter move, especially one spanning a distance an airline might route through a cold connecting hub, ground transport with a USDA-registered transporter is frequently the more dependable option, not just a fallback for when a flight gets embargoed.
This does not mean ground transport is risk-free in winter. A vehicle can still be delayed by road conditions, and a longer multi-day ground route means more total hours of travel than a direct flight would take. But the temperature risk itself, the specific hazard that causes airline cargo bookings to fall through with little warning, is effectively removed. See driving your own pet cross-country versus hiring a transporter for how to weigh a winter ground move against doing the drive yourself, since winter road conditions cut both ways on that comparison too.
Building a winter moving-week schedule around the embargo
If your move is scheduled for winter and you are still deciding between air cargo and ground transport, build in a real buffer before committing to a flight-based plan. Check the multi-day forecast for every airport on the itinerary as early as booking allows, and have a ground-transport fallback quoted in advance rather than scrambling for one the day a flight gets pulled. If you know your move will land inside the typical November-through-February embargo window for a destination with real winter weather, it is reasonable to plan for ground transport from the start rather than treating it as a backup plan.
What to pack differently for a winter ground transport
A winter ground move still benefits from some season-specific prep even with climate control handling the temperature question. Send along a familiar blanket for extra comfort during any brief stops, and confirm with your transporter how they handle rest and bathroom stops in genuinely cold conditions, since a longer stop in freezing weather is a different experience for a pet than the same stop in mild weather. If your pet has a short coat or is a puppy, kitten, or senior animal, mention that directly to the transporter, since these groups handle cold exposure differently even during brief transitions between a heated vehicle and an outdoor stop.
A winter-appropriate crate setup is also worth a second look before travel day. A crate placed directly against a vehicle wall or window can be colder than one positioned more centrally, and a thin crate pad that is fine in mild weather may not provide enough insulation from a cold floor during a longer trip. Ask your transporter how crates are positioned within the vehicle and whether extra bedding is provided or expected from you, so there is no ambiguity about who is supplying what on travel day itself.
Multi-leg winter itineraries carry compounding risk
A pet moving through two or three flight legs in winter faces the temperature-check rule at every single stop, not just the final destination, which means a multi-leg itinerary carries meaningfully more risk of a last-minute embargo than a single nonstop flight does. If a nonstop option exists for your route, even at a higher fare, it is worth weighing that cost against the real chance of a connecting-leg embargo disrupting a multi-stop winter booking. If nonstop is not available, ground transport becomes a more attractive comparison specifically because it removes this compounding multi-stop risk entirely.
Snub-nosed breeds face compounding risk in winter too
Brachycephalic, or snub-nosed, breeds carry extra airline restrictions that apply regardless of season, and winter conditions do not remove that risk even though the primary snub-nosed airline concern is usually associated with heat. Cold air can still be harder for a compromised airway to manage efficiently during ground handling and boarding, so if you are moving a snub-nosed breed in winter, treat both the cold-embargo rules and the airline's separate breed restrictions as fully in effect together, not as competing concerns where only one applies at a time. Ground transport tends to be the more consistently reliable option across both risk categories for these breeds specifically.
Confirming an airline's exact policy before you rely on any of this
Every figure in this article represents general, commonly cited industry thresholds, and individual airlines set their own exact numbers, documentation requirements, and exception processes that can differ from the ranges described here. Call your specific airline's cargo department directly before booking a winter pet flight and get their current temperature policy and any acclimation certificate requirements in writing or documented by email, rather than relying on a general rule of thumb when your pet's actual booking is on the line.
Booking a winter ground transporter with real lead time
Winter is also a season where a good ground transporter's schedule can fill up faster than expected, partly because road-condition planning sometimes means routes take longer and partly because a share of would-be air travelers switch to ground transport once they discover an embargo will affect their dates. See how far in advance to book pet transport for realistic lead times, and treat a winter booking with the same or slightly more urgency than you would a summer one, rather than assuming ground transport availability is more flexible simply because it avoids the airline embargo issue.
What a transporter's own winter protocol should look like
A reputable ground pet transporter should be able to describe their own cold-weather protocol clearly: how the vehicle's interior temperature is maintained and monitored, how rest stops are handled in freezing conditions, and what happens if a route is delayed by weather. If a transporter cannot answer these questions specifically, that is worth treating as a real red flag rather than a minor gap, the same way vetting a pet transport company covers more generally across every season, and confirming they carry active USDA Animal Welfare Act registration is one of the fastest ways to rule out an unqualified operator before winter weather adds any extra pressure to the decision.