Cold-chain shipping in India: a practical guide for shippers

Cold chain is road freight with one more thing to prove. A dry cargo shipment succeeds if it arrives complete and on time. A cold-chain shipment also has to arrive at the right temperature, and you have to be able to show that it stayed there all the way.

Most failures do not happen in the middle of a long run. They happen at the edges: a reefer box that was not pre-cooled, a door left open during a slow loading, product loaded warm, a sensor that stopped reporting and nobody noticed. This guide works through those edges in order.

Temperature classes

Temperature needs come from the product, not the truck. Confirm the range from your product specification or label before anything else.

Two practical notes:

• Frozen means −18 °C or colder at the product, not just in the air. Many shippers set the reefer below that to leave a margin for door openings and defrost cycles.
• Controlled room temperature is not ambient. An Indian summer can take an unrefrigerated box well above 40 °C, so CRT products often need an active reefer too.

Our cold-chain temperature guide lists common product categories and typical ranges.

Step 1: Choose the right reefer

A reefer truck is an insulated box with a refrigeration unit, usually powered by its own engine or by the truck. Check:

1. Unit capacity relative to box size and the lowest set point you need. A unit sized for chilled work may not hold frozen in summer.
2. Box condition. Damaged panels, worn door seals and holes for fittings leak cold air.
3. Floor. Grooved or T-bar floors let air return underneath the load.
4. Temperature monitoring. A display the driver can read, and ideally a telematics sensor that reports to you.
5. Cleanliness and odour. Especially for food and pharma.

Step 2: Pre-cool the box

A reefer is designed to hold temperature, not to pull heat out of warm product. Loading product into a warm box is the single most common cause of an excursion in the first hours of a trip.

1. Run the unit with the doors closed until the box reaches the set point.
2. Hold it there for a period before loading, so the walls and floor are cold too.
3. Record the box temperature before the doors open.
4. Load quickly, then close and let the unit recover.

Pre-cooling should be a recorded step, not an assumption. A reading taken at the dock, with time and temperature, is the evidence you will want later.

Step 3: Make sure the product is at temperature

The reefer maintains; it does not correct. Product should leave the cold room already at its target range. Loading frozen goods that have warmed on the dock, or chilled goods straight from production, pushes the unit beyond what it can recover during transit.

Keep dock exposure short. Stage product close to the door, and open the reefer only when the product is ready to go in.

Step 4: Load for airflow

Cold air has to circulate around the load and return to the unit. Blocking that path creates warm pockets even when the display reads correctly.

• Keep a gap at the top below the ceiling so air can travel to the rear doors.
• Do not load against the front bulkhead in a way that blocks the unit’s return.
• Use pallets or a grooved floor so air returns underneath.
• Leave space at the rear doors where the airflow turns.
• Do not overload. A box packed wall to wall with no gaps will not hold temperature evenly.
• Secure the load so it cannot shift and close the air gaps during the trip.

Step 5: Monitor, log and act

Every cold-chain shipment should produce a temperature record. There are two layers:

1. Data loggers placed with the product record readings at intervals and are downloaded at delivery. They give a trustworthy record, but only after the fact.
2. Live telematics reports reefer temperature and GPS location while the truck is moving. This is what lets someone act before a problem becomes a loss.

Alarms are only useful if someone responds. Agree in advance:

• The alarm threshold for each product
• Who receives the alert, day and night
• What they do: call the driver, check the unit, divert to a cold store
• How long an excursion can last before the load is quarantined for assessment

What a control tower adds

When you run many reefers at once, the question stops being “is this truck all right?” and becomes “which of these trucks needs attention right now?”. A control tower answers that by putting live GPS and temperature for every truck on one screen, flagging exceptions as they happen (a temperature rise, a sensor gone quiet, a long halt, a truck waiting too long at a dock), and keeping the record that proves the chain held.

SSL built and runs a live 4PL cold-chain control tower for a leading ice-cream maker’s primary distribution, covering 7 factories and a 98-truck dedicated roster drawn from 6 transporters (August 2026). The lesson from running it daily is simple: a sensor that goes silent is itself an exception, never a sign that all is well. Read more about our 4PL control tower service.

Step 6: Documents

Cold-chain consignments carry the usual road documents plus a few of their own:

• Tax invoice or delivery challan
• E-way bill where the value crosses the threshold under Rule 138 of the CGST Rules
• Consignment note (LR) stating the required temperature range
• Pre-cooling record for the reefer, with time and temperature
• Temperature log or logger report at delivery
• Product documents: batch details, and for pharma, any documents your quality system requires

Regulatory basics

Food: FSSAI

Under the Food Safety and Standards Act, 2006, businesses that transport food are food business operators. They need FSSAI registration or a licence depending on their scale. The criteria and application are on the FSSAI FoSCoS portal. As a shipper, ask your transporter for a copy, and check it is current.

FSSAI’s hygiene requirements also apply in transport: clean vehicles, separation from non-food cargo, and temperature control where the food needs it. See FSSAI for the regulations in force.

Pharma: CDSCO Good Distribution Practices

For medicines, the CDSCO has issued guidelines on Good Distribution Practices for pharmaceutical products. They cover qualification of vehicles and equipment, temperature mapping, monitoring, handling of excursions, and documentation through the distribution chain. Pharma shippers usually audit transporters against these guidelines and their own quality procedures.

Neither regime is satisfied by a certificate alone. Both expect evidence that temperature was controlled on each shipment.

Common failure points

• Box not pre-cooled, or pre-cooling not recorded
• Product warm on the dock before loading
• Doors open for long periods during slow loading or multi-drop delivery
• Load blocking the air return or packed without gaps
• Unit switched off to save fuel during halts
• Sensor offline and nobody noticing the silence
• Alarm sent to a number no one answers at night

For scale, SSL arranged 2,300+ cold-chain truck hires between September 2025 and August 2026. Across that volume, the same short list above accounts for most of what goes wrong.

Checklist

Before a cold-chain dispatch:

• Required temperature range confirmed from the product specification
• Reefer unit capable of that set point in current weather
• Box inspected: seals, panels, floor, cleanliness
• Box pre-cooled and the reading recorded with time
• Product at target temperature before loading
• Load pattern leaves air gaps top, rear and underneath
• Data logger placed with the product, or live sensor confirmed reporting
• Alarm threshold, recipients and response agreed
• Transporter’s FSSAI registration or licence on file (food)
• GDP requirements met and documented (pharma)
• E-way bill, LR with temperature range, and invoice ready

For reefer capacity on your lane, see our cold chain and reefer service or request a quote.