How do you keep your fruit shipments from spoiling? When fresh produce is shipped, you need precise temperature control to keep its quality and protect your investment.
Each variety of produce is different, and managing the reefer container temperature for these fruits is necessary for your success.
This guide covers the ideal settings to use to keep your cargo fresh during transit.
Ideal Reefer Container Temperature for Different Fruit Categories
| Product | Temperature (Fahrenheit) | Temperature (Celsius) | Operational Notes |
| Strawberries | 31°F to 32°F | -0.5 °C to 0°C | Strawberries require rapid pre-cooling and high humidity to prevent moisture loss. |
| Blueberries | 32°F to 34°F | 0°C to 1°C | Blueberries are extremely sensitive to mold, so they benefit from controlled atmosphere shipping. |
| Raspberries | 32°F to 34°F | 0°C to 1°C | Raspberries are highly perishable, which is why they require precise humidity control. |
| Blackberries | 32°F to 34°F | 0°C to 1°C | Blackberries require immediate cooling post-harvest to maintain their firmness. |
| Grapes (Table) | 32°F to 34°F | 0°C to 1°C | Grapes are shipped with sulfur dioxide pads to control decay. |
| Kiwi (Actinidia) | 32°F to 34°F | 0°C to 1°C | Kiwis are highly sensitive to ethylene gas, so they must be kept away from ethylene producers. |
| Apples (Gala/Fuji/Delicious) | 32°F to 34°F | 0°C to 1°C | Apples should be stored at near-freezing temperatures because they produce ethylene. |
| Pears (Bartlett/Anjou) | 30°F to 32°F | -1°C to 0°C | Pears require prompt cooling because they have a high risk of friction bruising. |
| Quince | 32°F to 34°F | 0°C to 1°C | Quinces are prone to skin browning if kept too long at low temperatures. |
| Peaches | 31°F to 32°F | -0.5°C to 0°C | Peaches are susceptible to internal breakdown if kept between 36°F and 46°F. |
| Nectarines | 31°F to 32°F | -0.5°C to 0°C | Nectarines are similar to peaches in that they are both prone to mealiness if stored incorrectly. |
| Plums | 31°F to 32°F | -0.5°C to 0°C | Plums require slight temperature adjustments to reduce flesh browning. |
| Apricots | 31°F to 32°F | -0.5°C to 0°C | Apricots have a short storage life; their fragile skin requires careful handling. |
| Cherries (Sweet) | 30°F to 32°F | -1°C to 0°C | High humidity is needed to preserve the green stems of cherries. |
| Oranges (Navel/Valencia) | 38°F to 48°F | 3°C to 9°C | Temperatures for the storage of oranges vary by origin, and low temperatures can cause rind pitting. |
| Lemons | 50°F to 55°F | 10°C to 13°C | Lemons are susceptible to chilling injury at temperatures below 50°F. |
| Limes | 48°F to 55°F | 9°C to 13°C | Low temperatures turn the limes’ skin yellow and cause pitting. |
| Grapefruit | 50°F to 60°F | 10°C to 15°C | Grapefruits are vulnerable to chilling injury; the exact temperature depends on the harvest season. |
| Mandarins / Tangerines | 40°F to 46°F | 4°C to 8°C | These fruits are prone to flavor alteration if ventilation is poor. |
| Bananas (Green/Ripening) | 55°F to 59°F | 13°C to 15°C | Strict temperature control is required for bananas. Levels dropping below 55°F cause chilling injury. |
| Mangoes | 54°F to 55°F | 12°C to 13°C | Chilling injury causes grey skin color and uneven ripening of mangoes |
| Pineapples | 45°F to 55°F | 7°C to 13°C | The crowns on pineapples can brown if the temperature drops too low. |
| Papayas | 50°F to 55°F | 10°C to 13°C | Papayas require a higher temperature to ensure regular ripening. |
| Avocados (Hass) | 40°F to 45°F | 4°C to 7°C | The setting depends on fruit maturity; ripe avocados handle lower temperatures better |
| Passion Fruit | 50°F to 55°F | 10°C to 13°C | Passion fruits have a high respiration rate. Their skin wrinkles naturally during transit. |
| Pomegranates | 41°F to 45°F | 5°C to 7°C | Pomegranates are prone to internal breakdown and skin dehydration. |
| Figs (Fresh) | 32°F to 34°F | 0°C to 1°C | Figs are highly perishable, and their soft texture requires single-layer tray packing. |
| Guava | 46°F to 50°F | 8°C to 10°C | Guavas are extremely sensitive to bruising and rapid softening. |
| Lychee | 36°F to 41°F | 2°C to 5°C | Lychees need high humidity, as it is essential to prevent browning of the outer shell. |
| Dragon Fruit (Pitaya) | 50°F to 54°F | 10°C to 12°C | Dragon fruits are prone to chilling injury if stored below 50°F. |
| Persimmons | 30°F to 32°F | -1°C to 0°C | Persimmons benefit from a controlled atmosphere to extend their storage life. |
| Star Fruit (Carambola) | 48°F to 50°F | 9°C to 10°C | The rib edges of star fruits are highly susceptible to physical damage. |
| Watermelon | 50°F to 59°F | 10°C to 15°C | Watermelons lose color and crispness if stored below 50°F. |
| Cantaloupe | 36°F to 41°F | 2°C to 5°C | Cantaloupes can be kept on settings that are cooler than watermelons, but watch for surface mold. |
| Honeydew | 45°F to 50°F | 7°C to 10°C | Honeydews are prone to chilling injury, and they require ventilation to clear ethylene. |
The Science of Fruit Preservation
To keep fruits fresh during long journeys, reefer containers should control how the cargo breathes, ripens, and holds moisture. Understanding this science will not only help you prevent spoilage but also make sure that your shipments arrive in perfect condition.
Respiration and Heat Generation
Fresh fruits are not dead cargo; they are living organisms that continue to breathe even after harvest. They take in oxygen, use up their stored sugar, and produce carbon dioxide, water, and respiratory heat.
The Challenge: If this heat builds up inside the container, the temperature rises. This speeds up the fruit’s aging process and causes rapid spoilage.
The Solution: The Reefer container must constantly remove this heat so it forces cold air up through the bottom floor, called the T-bar floor, and passes through the cargo to keep everything cool.
Ethylene Gas Management
Ethylene gas is a natural gas released by fruits as they ripen. It acts like an invisible signal that tells the surrounding fruits to ripen as well.
The Challenge: If you let this gas build up, it creates a chain reaction that quickly rots the entire shipment.
The Solution:
Fresh Air Ventilation: The reefer container opens fresh air vents to flush out ethylene and carbon dioxide, which are replaced by clean outside air.
Controller Atmosphere: High-tech containers actively lower oxygen levels and raise carbon dioxide levels. This balance puts the fruit into a state of hibernation that stops it from producing or reacting to the ripening gas.
Humidity Control
Fruits are mostly made of water. Once picked, it can no longer draw moisture from the plant, so it slowly loses water to the surrounding air.
The Challenge: If the air inside the reefer container is too dry, your fruits will shrivel and lose weight. If the air is too wet, moisture condenses on the skin, which creates a breeding ground for mold and fungi.
The Solution: Most fruits need a high humidity setting, usually between 85% to 95%. Reefer units use advanced sensors to maintain this exact balance that prevents both drying out and mold growth.
Factors Affecting Reefer Performance
Setting the right temperature is only half the battle. To ensure your reefer container operates at peak performance, you must manage how the container is handled, how air moves inside, and the environment outside.
1. Pre-cooling requirements
Reefer containers are designed to maintain temperature, not to cool down warm cargo. You must pre-cool your fruit to its optimal transit temperature before loading it into the reefer. Additionally, keep the reefer unit turned off while loading to prevent warm, humid outside air from entering and creating frost on cooling coils.
2. Air circulation
For cold air to protect your shipment, it has to move freely around and through every single box. You need to load cargo within the designated height limit below the red line on the container wall and ensure that boxes have ventilation slots.
This allows the air to be forced up from the floor to circulate properly through the entire load instead of getting blocked and creating hot spots.
3. Ambient Conditions
The weather outside your container changes constantly as it moves across different climates. Extreme outside temperatures, whether intense heat or freezing winter air, force the reefer unit to work much harder to keep the interior stable.
You must ensure the reefer’s machinery is well-maintained and monitored throughout the journey to handle these changing outside environments.
Conclusion:
Shipping fresh fruits successfully comes down to maintaining the exact temperature your cargo needs. By keeping precise control over the climate inside the container, you slow down how fast the fruits age and prevent them from spoiling.
When you combine steady temperature settings with proper pre-cooling and balanced airflow, you protect your entire shipment from transit damage.
If you have any questions regarding this topic or are looking for a custom reefer container manufacturer, message our team for expert guidance.
Frequently Asked Questions:
Why do different fruits require different temperatures during shipping?
Fruits are living organisms that continue to respire after harvest. Different fruits have unique biological thresholds: some thrive in near-freezing climates, while tropical fruits suffer cell damage if they get too cold. Matching the exact temperature to the specific fruit profile is important to slowing down aging without damaging the tissue.
Can I ship different types of fruit together in the same reefer container?
Mixing different fruits in one container is risky. Fruits not only require different optimal temperatures, but they also have different respiration rates and release varying amounts of ethylene gas. Shipping high-ethylene fruit with a gas-sensitive fruit will cause the entire shipment to spoil prematurely.
What role does the fresh air vent play in temperature control?
Because fruit breathe, they consume oxygen and release carbon dioxide, moisture, and heat. If the fresh air vent is kept closed, the buildup of respiratory gases and internal heat will overwhelm the refrigeration system. The vent must be opened to a precise percentage to flush out carbon dioxide and ethylene gas while bringing in fresh oxygen.
Does the reefer container cool down warm fruit picked straight from the field?
No. Reefer containers are designed to maintain cargo temperature, not to remove field heat. Fruits must always be pre-cooled to their specific ideal transport temperature before they are loaded into the container.
Do defrost cycles ruin the fruit?
No. Reefers automatically melt ice on their internal coils periodically, but these cycles are kept to 15-30 minutes so the brief warmth doesn’t penetrate the core of the fruit.
You may also find this blog post useful
How Does a Reefer Container Work?
How to Rent a Reefer Container?
A Guide to Reefer Container Temperature Monitoring and The Challenges You May Encounter
How are Reefer Containers Powered?
Different Types of Reefer Containers
About The Author
Evan Wang
I am Evan Wang, the General Manager, Marketing Director, and SEO Expert at Sunnyda Cold Room. I have over 20 years of experience in the refrigeration industry, and my expertise is in commercial refrigeration solutions.
I’d be delighted to share practical ideas about refrigeration products, project selection, export trade, SEO, and marketing.
Let’s connect!
