A checklist built from official USDA and Mexican government sources, not press releases or guesswork.
What Growers Need Before Shipping Corn from the U.S. to Mexico
Mexico is the largest export market for U.S. corn.
Corn is also the single largest U.S. agricultural export to Mexico by value, more than $5.6 billion in 2025 out of roughly $30 billion in total U.S. agricultural exports to the country.
The reason is a straightforward supply gap. Mexico's livestock and feed industry consumes far more yellow corn than the country grows on its own.
For more than a decade, the U.S. has covered most of that shortfall, about 90-94% of it, averaging roughly 12.5 million metric tons a year between 2009 and 2022.
If you're a grower weighing this corridor, the trade volume isn't the hard part. The paperwork is.
A USMCA certificate of origin, a phytosanitary certificate, the right HS code, SENASICA compliance on the Mexican side. One missing document can hold a shipment at the border regardless of how good the corn is.
3 Things Most Exporters Get Wrong
The USDA inspection rule isn't what most exporters assume.
Grain generally has to be officially inspected and weighed under the U.S. Grain Standards Act, but there's a standing waiver for grain shipped by rail or truck to Mexico.
That's most of this corridor. Knowing which rule actually applies to your shipment saves a step most guides don't mention.
GM corn policy changed in 2025, and it's easy to find outdated information.
Mexico repealed its restrictions on importing genetically modified corn in early 2025 following a USMCA dispute panel ruling. A separate constitutional amendment bans domestic cultivation of GM corn in Mexico, but not imports. Those are two different rules, and conflating them leads growers to assume a restriction that no longer applies to their shipment.
"HRZ" and "HRF" are not interchangeable
Getting them confused points you to the wrong regulatory document. HRZ covers animal products. Corn, a plant product, falls under a separate phytosanitary framework. It's a small distinction with real consequences if you're the one filling out the paperwork.
U.S. Export Requirements and Documentation
Before your shipment moves, you need four things. A USMCA certificate of origin: no official government form required, just nine data elements usually added directly to your commercial invoice.
A phytosanitary certificate, if Mexico requires one for your specific shipment. The correct Schedule B classification for your corn's grade and color. And your Electronic Export Information filed in AES. Aflatoxin testing applies regardless of shipment size or transport mode.
Mexican Import Requirements and SENASICA Compliance
On the Mexico side, your buyer needs a registered Importer of Record. They also need a licensed Agente Aduanal to file the Pedimento de Importación.
Confirmation from SENASICA's phytosanitary module that your shipment meets current requirements under NOM-028-FITO-1995 is also needed. Tariff rates and GM corn policy have both moved substantially in the past year, so this is not a section to treat as settled.
What's Inside the Full Checklist
- Part 1: Before You Ship: The complete U.S. export side, from FGIS inspection status to your USMCA origin statement
- Part 2: Before It Clears: The complete Mexico import side, including current GM corn status and tariff cautions
- U.S. Documents Checklist: A printable, checkbox list for your logistics team
- Mexico Documents Checklist: What your buyer's customs broker will need, split by who files it
- Export-import process flowchart: A visual walkthrough from your warehouse to Mexican customs clearance
- Appendix: Key Contacts: Real USDA and U.S. Commercial Service contacts, not a generic support line
Every claim in the checklist traces back to an official U.S. or Mexican government source. The full source list is included at the end.
Frequently Asked Questions
Do the requirements differ for yellow corn versus white corn?
Yes, starting with classification. Yellow dent corn and white corn fall under different 10-digit HS/Schedule B codes, so make sure you're using the right one, not a generic corn code. On the Mexican side, Mexico's 2025 repeal of GM corn import restrictions covers human, feed, and industrial use broadly, but yellow corn (largely feed and industrial use) and white corn (largely human consumption) sit in different parts of Mexico's domestic market, so it's worth confirming end-use-specific requirements with your buyer's broker rather than assuming one set of rules covers both.
Is there a minimum export volume that changes what I need to file?
Not for the core requirements. A USMCA origin statement, EEI filing over $2,500, and phytosanitary certification (if required for your shipment) apply regardless of how much corn you're shipping. There's a separate, unrelated FGIS inspection waiver tied to shipment size and mode of transport, but it doesn't change your documentation requirements. It only affects whether official USDA grain inspection is mandatory.
Does it matter if I ship by rail, truck, or ocean vessel?
It affects one specific rule: grain shipped by rail or truck to Mexico is exempt from the mandatory USDA grain inspection and weighing requirement that otherwise applies. Ocean shipments don't get that exemption. Transport mode can also determine which Mexican port of entry handles your shipment, and not every crossing has agricultural inspection capacity, so confirm your route can actually process the shipment before it departs.
Compiled from official U.S. and Mexican government sources, including USDA APHIS, USDA AMS/FGIS, U.S. Census Bureau Schedule B, U.S. Customs and Border Protection, and USDA FAS's FAIRS Country Report for Mexico. Not legal or customs advice. Last verified August 2026.
