Short answer: an ultra-low temperature (ULT, or -80°C) freezer is normally moved empty, and its contents travel separately in a pre-chilled backup freezer or in validated temperature-controlled containers. The move works when the lab agrees in writing how long each sample type may be out of the freezer, how temperature will be monitored, and who is responsible for each step.
Last updated October 5, 2026. Regulations and manufacturer instructions change. Confirm the details below with your environmental health and safety (EHS) office and your freezer’s manual before you plan a move.
Can a -80°C freezer be moved with the samples still inside?
In most cases, no. A loaded ULT freezer is heavy, and a freezer that is tilted, jolted or left without power starts to warm quickly. The freezer’s own manual is the authority on how it must be prepared for a move, so check it first. In practice most labs choose one of two approaches.
| Approach | How the samples stay cold | Main risk | What to document |
|---|---|---|---|
| Empty-freezer move with a backup freezer | Samples are transferred to a pre-chilled ULT freezer at the origin or destination, or to a temporary storage freezer. | Samples are out of the freezer during each transfer. | Transfer start and end times, rack and box map, who handled each transfer |
| Empty-freezer move with transport containers | Samples travel in dry ice shippers or other validated containers while the freezer is moved separately. | Dry ice runs out, or the container is opened or delayed in transit. | Container contents, dry ice loaded, loading time, logger readings, receipt time |
| Freezer moved with contents (rare) | Only where the manufacturer and the sample owner both approve and backup power is available during transport. | Any power or temperature loss affects every sample at once. | Written approval, continuous temperature record, backup power plan |
What is the step-by-step process for relocating a ULT freezer?
Before the move
- Inventory the contents. Record every rack and box, the sample owner, and the temperature each item must stay at.
- Set temperature limits in writing. Ask each sample owner how long their material may be out of the freezer and what the highest acceptable temperature is. There is no universal figure; it depends on the sample type and the lab’s own stability data.
- Arrange the destination. Confirm the new location has the correct electrical supply, floor loading, ventilation and clearance, and that the freezer can get through doorways and elevators.
- Plan the backup storage. Pre-chill any temporary freezer or shipper before samples go in.
- Brief the people involved. The EHS office, the principal investigator or sample owner, facilities, the freezer manufacturer’s service technician if needed, and the moving team should each know their role.
On move day
- Transfer samples quickly, in the order agreed, with a second person recording what is moved and when.
- Place a calibrated data logger with the samples in each shipper or temporary freezer.
- Defrost, drain and prepare the empty freezer the way the manufacturer specifies, then secure doors and shelves for transport.
- Keep dry ice and the people handling it out of enclosed spaces without ventilation (see the safety section below).
- Hand off at each point with a signed record. See our guide to chain of custody in laboratory transport.
After the move
- Power the freezer on as the manufacturer instructs and let it reach its set point.
- Confirm the temperature with an independent calibrated thermometer before any samples go back in.
- Test the alarm and any remote monitoring.
- Return samples in the order and layout recorded on the inventory, and reconcile the final count against the original.
- File the temperature records with the move documentation.
Is dry ice regulated, and is it safe to transport in a truck?
Dry ice is solid carbon dioxide (listed by DOT as UN1845). Two separate issues matter: the transport rules and the safety hazard to people.
Transport rules
Under 49 CFR 173.217, packaging for dry ice must be designed to let carbon dioxide gas escape so pressure cannot build up and rupture it. Never seal dry ice in an airtight container. Dry ice is treated as a regulated hazardous material for air and vessel shipments, which carry additional marking and documentation requirements. Highway shipments are subject to the packaging rule above, but your employer, your carrier and your institution may set stricter requirements. Check the current regulation text with your EHS office.
Safety for the people involved
As dry ice warms it turns into carbon dioxide gas, which can build up in vehicles, cold rooms and other enclosed spaces. The NIOSH Pocket Guide entry for carbon dioxide lists these limits:
- Recommended exposure limit: 5,000 ppm averaged over a work shift, with a short-term limit of 30,000 ppm.
- OSHA permissible exposure limit: 5,000 ppm averaged over a work shift.
- Immediately dangerous to life or health (IDLH): 40,000 ppm.
The same entry lists headache, dizziness, breathing difficulty and loss of consciousness among the effects of exposure, and frostbite from skin contact with dry ice. In practice:
- Keep dry ice out of occupied passenger cabins and ventilate any cargo area where it is carried.
- Wear insulated gloves and eye protection; do not handle dry ice with bare hands.
- Never store dry ice in a sealed room or an unventilated cold room.
How is temperature monitored during the move?
Place at least one calibrated data logger or probe in each shipper or temporary freezer, so the record shows the temperature the samples actually experienced rather than the air in the truck. Set alarm thresholds before the move using the limits the sample owners agreed to. Keep the logger readings with the chain-of-custody record. For a broader look at cold-chain documentation, see our guides to biological sample storage and transport and GMP storage and cold chain management. Repository best practices, including the handling and transport of stored specimens, are covered in the ISBER Best Practices: Recommendations for Repositories.
Who is responsible for each part of the move?
| Task | Usually handled by |
|---|---|
| Deciding allowable temperature and time limits for samples | Sample owner or principal investigator |
| Classifying dry ice, chemicals and any hazardous contents | EHS office with the moving team |
| Power, ventilation and floor loading at the destination | Facilities |
| Shutdown, recommissioning and calibration of the freezer | Freezer manufacturer or a qualified service technician |
| Packing, transport, placement and handoff records | Moving team |
Responsibilities are different on every project. Settle them in writing during planning, not on move day.
What should you ask a laboratory mover about freezer moves?
- How will samples be kept at temperature, and how is that recorded?
- What happens if a container, vehicle or power source fails mid-move?
- How are dry ice and ventilation handled in the vehicle?
- What documentation do you provide at each handoff?
- Which tasks will your team perform, and which need the manufacturer or another qualified provider?
Laboratory Movers supports temperature-controlled transport at refrigerated, frozen, ultra-low-temperature and cryogenic ranges. Monitoring, backup resources and handoff procedures are set for each project. See our lab equipment moving and laboratory relocation services pages, or contact us to talk through a freezer relocation.
Frequently asked questions
Can a -80°C freezer be moved with samples inside?
Usually not. Most labs move the freezer empty and transfer the contents to a pre-chilled backup freezer or to temperature-controlled transport containers. Follow your freezer’s manual, and have the sample owner approve any exception in writing.
How long can samples be out of a -80°C freezer?
It depends on the sample type and the lab’s own stability data, so there is no single answer. Agree the maximum time and temperature for each sample type with its owner before the move, and write it into the move plan.
Is dry ice regulated for truck transport?
For highway transport, 49 CFR 173.217 requires packaging that lets carbon dioxide gas vent and prevents pressure buildup, so dry ice must never be sealed airtight. Dry ice is regulated as a hazardous material for air and vessel shipments. Confirm current requirements and any stricter institutional rules with your EHS office.
Is dry ice dangerous in a vehicle?
It can be. Carbon dioxide gas builds up in enclosed spaces. NIOSH lists a 5,000 ppm recommended exposure limit averaged over a shift, a 30,000 ppm short-term limit and a 40,000 ppm immediately-dangerous level. Keep dry ice out of occupied cabins and ventilate cargo areas.
How is temperature monitored during a freezer relocation?
With calibrated data loggers or probes placed with the samples, alarm thresholds agreed before the move, and the readings kept with the chain-of-custody record.
What should happen after the freezer arrives?
Power it on as the manufacturer instructs, let it reach its set point, confirm the temperature with an independent calibrated thermometer, test the alarm, and only then return samples, reconciling the count against the original inventory.