Dry ice weight limits by carrier

Every major U.S. carrier — FedEx, UPS, and USPS — accepts dry ice shipments, but each has different weight limits and thresholds that affect how your shipment is handled. Exceeding a carrier's dry ice limit is one of the fastest ways to get a shipment rejected at the counter. Knowing the limits before you pack saves time, money, and the frustration of splitting shipments or switching carriers at the last minute.

Here's a direct comparison of dry ice weight limits across all three carriers for both air and ground transport.

Quick Comparison Table

*FedEx publishes a 200 kg dry ice maximum per package. UPS domestic ground in the U.S. 48 contiguous states is handled like standard UPS Ground, but both carriers can apply service, route, account, or aircraft-specific limits. Always verify with your account representative for large-quantity shipments.

FedEx Dry Ice Weight Limits

Air Services

FedEx publishes a 200 kg dry ice maximum per package for dry ice shipments. Service, route, aircraft, and account constraints can still require a lower quantity.

For large or unusual quantities, coordinate with the FedEx Dangerous Goods department before tender.

Ground Services

FedEx Ground accepts dry ice under its standard Ground package limits. FedEx says dry ice is not regulated as a hazardous material in Ground service, but the package should still be marked as dry ice and the pickup driver should be told it contains dry ice.

International

FedEx accepts international dry ice shipments with standard UN1845 documentation. Requirements may vary by origin and destination country.

UPS Dry Ice Weight Limits

Air Services — The 2.5 kg Threshold

UPS does not publish a hard per-package dry ice weight cap, but they have an important carrier-specific policy: for domestic air shipments of non-medical goods, packages containing more than 2.5 kg of dry ice may trigger an enhanced documentation and audit path.

What this means in practice:

• Under 2.5 kg per package: Standard UN1845 acceptance — Class 9 label, outer markings, AWB text. Your shipment goes through normal processing.
• Over 2.5 kg per package (domestic air, non-medical): UPS may require additional documentation, an enhanced review at acceptance, or supplementary paperwork. The specific requirements can vary by UPS facility and the handling agent's judgment.

This 2.5 kg threshold is unique to UPS. Neither FedEx nor USPS has the same breakpoint.

Medical shipments (biological specimens, diagnostics, vaccines, medical supplies) are generally handled with more flexibility around this threshold. UPS recognizes that medical shipments often require larger quantities of dry ice to maintain temperature compliance, and the audit path may not apply. However, you should still declare the correct weight and be prepared to explain the medical nature of the shipment if asked.

Ground Services

UPS Ground in the U.S. 48 contiguous states does not apply the 2.5 kg air threshold; UPS says to process those dry ice shipments as standard Ground shipments. UPS notes that shipments to or from Alaska, Hawaii, Puerto Rico, and Avalon, CA must be processed as air shipments.

International

UPS accepts international dry ice shipments, but some routes may require an active UPS contract with dangerous goods authorization. Without a contract, international dry ice shipments could be refused. If you regularly ship dry ice internationally via UPS, establish this authorization with your account team proactively.

USPS Dry Ice Weight Limits

Air Services — 5 lb Hard Cap

USPS has the most restrictive dry ice weight limit of the three carriers: a maximum of 5 pounds (approximately 2.27 kg) of dry ice per mailpiece for any service that may travel by air.

This applies to Priority Mail, Priority Mail Express, and any other USPS service where the mailpiece could be placed on an aircraft. It is a hard cap — there is no exception process, audit path, or enhanced documentation option. If your package contains more than 5 lbs of dry ice and needs to travel by air, USPS cannot accept it.

Your options if you exceed 5 lbs:

• Split into multiple packages — each under 5 lbs of dry ice. Note that each package still needs its own full set of UN1845 labels and markings.
• Ship via ground — USPS Retail Ground does not have the 5-lb dry ice cap, but you must add a "Surface Only" marking and accept slower transit times.
• Switch carriers — FedEx and UPS accept higher dry ice quantities per package.

Ground Services

USPS ground/surface services do not have the 5-lb dry ice restriction, since the cap is specifically tied to air transport safety. Standard USPS package weight limits apply.

However, USPS ground shipments containing dry ice must be marked "Surface Only" or "Surface Mail Only" on the outer package. This prevents the mailpiece from being inadvertently loaded onto an aircraft, where it would violate the 5-lb limit.

International — Prohibited

USPS does not accept dry ice in any international mail class, regardless of quantity. Zero tolerance — even a small amount of dry ice disqualifies the mailpiece from international USPS service. This is a blanket prohibition across all international products (Priority Mail International, Priority Mail Express International, First-Class Mail International, etc.).

For international dry ice shipments from the U.S., use FedEx or UPS.

How Weight Limits Affect Your Shipping Strategy

Small Quantities (Under 2.27 kg / 5 lbs per Package)

All three carriers accept shipments at this level with standard documentation. USPS is viable for air and often the cheapest option. UPS and FedEx are straightforward.

Best for: Individual consumers, small laboratory samples, low-volume food shipments.

Medium Quantities (2.27 kg to 2.5 kg per Package)

USPS air is now excluded (over 5 lbs). FedEx and UPS both accept without additional friction. UPS is right at the 2.5 kg threshold, so you're fine as long as you stay at or below 2.5 kg.

Best for: Research labs, small clinical shipments, meal kit companies with moderate dry ice needs.

Larger Quantities (Over 2.5 kg per Package)

USPS air is out. UPS domestic air may trigger the enhanced audit path. FedEx handles these quantities with standard UN1845 documentation and is generally the path of least resistance.

Best for: Biotech and pharma companies, large-volume food shippers, clinical trial logistics. If using UPS, contact your account rep about the audit process beforehand.

High-Volume Shipments (Tens or Hundreds of kg Total)

At this scale, you're likely working with a carrier account manager regardless. FedEx and UPS both handle large dry ice volumes routinely for enterprise customers. Advance coordination with the carrier's dangerous goods team is recommended before any package approaches 200 kg of dry ice or a lane-specific limit.

Best for: Cryoport, clinical trial logistics companies, large food distributors, industrial cold chain operations.

Weight Conversion Reference

Since USPS uses pounds and most IATA/carrier documentation uses kilograms, here's a quick conversion reference:

Check Your Shipment Against Weight Limits Instantly

Rather than memorizing carrier-specific thresholds, use Dry Ice Wizard to evaluate your shipment in seconds. Enter your carrier, mode, dry ice weight per package, and number of packages — the tool immediately tells you:

• Whether your shipment is within weight limits (green/yellow/red)
• If you've hit the USPS 5-lb cap or UPS 2.5 kg threshold
• What documentation is required for your specific weight and carrier
• Print-ready labels, markings, and checklists calibrated to your shipment

No guessing, no searching through carrier PDFs.

Check your dry ice weight limits now →

Important Notes

• Weight limits and carrier policies can change. Always verify current requirements with your carrier's official guidance before shipping.
• This guide was last reviewed in June 2026.
• Official carrier resources: FedEx dry ice | UPS coolants and refrigerants | USPS Publication 52 §349.32 | USPS PI 9A
• This applies to UN1845 dry ice used as a refrigerant for non-dangerous goods only.

Last updated: June 2026 | dryicecompliance.com