When the Douglas, Ariz., port reopens to Mexican cattle Monday, Aug. 24, 2026, the first loads won’t simply walk through the gate. After more than a year of closure over New World screwworm (NWS) concerns, the U.S. Department of Agriculture (USDA) and the Arizona Department of Agriculture are layering inspections, treatments, traceability and new state-level checks on every animal that crosses.
Arizona Agriculture Director Paul Brierley says he’s confident in the system.
“I’m confident that it’ll keep it from coming in on cattle,” Brierley explains. “There’s still the problem of wildlife and pets, but as far as cattle, the protocols that USDA’s instituted and the protocols that we’ve instituted, I don’t believe it’ll come in on the cattle they’re processing.”
Despite a confirmed bovine case of NWS in the Mexican state of Sonora just days before the reopening, the U.S. Department of Agriculture (USDA) confirmed on Thursday afternoon that plans remain unchanged. In an official statement on X, USDA announced: “We have no plans to change the Douglas, Ariz., port reopening on 8/24.” The agency added that the case — located 292 miles from the border — has triggered a rapid, layered and aggressive containment response.
As the Agua Prieta-Douglas crossing prepares to receive its first shipments of cattle in over a year, U.S. producers are left weighing the economic relief of fresh feeder cattle supply against the threat of NWS.
Uncompromising Biosecurity: The Multi-Tiered Defense
The primary concern surrounding the reopening is NWS. However, state officials, brokers and feeders express overwhelming confidence in the multi-tiered defensive barriers established on both sides of the border.
Before crossing, cattle must undergo at least three separate veterinary inspections and two rounds of anti-parasitic treatments:
- At the Ranch of Origin: Cattle are pre-inspected and treated with an ivermectin or dormectin injection.
- At the Mexican Export Facility: Vets inspect the herd, checking for any open wounds, ticks or lesions.
- The Dipping Vat: Cattle must swim through a dipping vat at the APHIS facility, fully submerging their heads under the supervision of a USDA veterinarian.
For beef producers concerned about transmission, industry leaders point out the border inspection process remains one of the most thorough in modern agriculture.
“There’s no way a screwworm will come into the United States on a bovine. It just won’t happen,” insists Wesley Eade of EMCO Cattle Co., a longtime cattle feeder in Arizona and California whose business has brought cattle across the border for decades. “These cattle [will] be cleaner than a load of cattle coming out of South Texas now.”
Bernie Teran, a veteran Mexican cattle broker with 35 years of experience, agrees. “Trust me, by the time we get them on the U.S. side, there is no way they’re going to have screwworm.”
Modernizing Traceability: The Transition to Electronic ID (EID)
On the U.S. side, Brierley says Arizona’s new rules add another layer: mandatory electronic identification (EID) tags, on‑site veterinarians issuing certificates for each animal, and state staff double‑checking paperwork and destinations as the port ramps up from a few hundred head toward its usual volume of 1,200 to 1,500 cattle per day.
The EID tags replace the antiquated blue metal clip tags. “Those blue metal tags did cause some issues with rejection of animals. Because of the type of ear tag and the timing with when those tags were placed, they caused some fresh wounds,” explains New Mexico State Veterinarian Dr. Samantha Holeck.
Holeck emphasizes EIDs will drastically improve processing speed and accuracy. “Once the animals enter the United States, yes, it definitely will help to speed that process up, and it’ll provide some reassurance to the states who are receiving those cattle.”
The EID requirements ensure every animal can be traced directly back to its herd of origin in Sonora — a state widely regarded as the “gold star” of Mexican animal health.
The Process on Day 1
On Sunday evening, Teran says he received a text from Union Ganadera that said, “The crossing is a go for tomorrow with 13 lots totaling 716 head all steers ready for inspection.”
He explains the process he expects on Monday: USDA officials and Brierley on Monday morning will go to the Mexican side a do a walk through. Then the cattle go through a chute where they’re physically inspected. From there they’re weighed, which will be the pay weight. Once everything is done, then the dipping process starts then about 2 p.m. or 3 p.m. they will open up the gate and then they cross lot per lot into the U.S.
Once they cross then brokers like Teran start the sorting process for their buyers — stockers and feedlots.
The Phased Reopening: Timeline and Capacity
The USDA’s strategy is designed to test and refine logistics before returning to full commerce.
If the Douglas port operates successfully for 30 days, the USDA will evaluate opening eastern ports of entry, including Santa Teresa and Columbus in New Mexico. When fully operational, the combination of these ports can move between 3,500 and 4,000 head of cattle per day.
Notably absent from the initial phase is Nogales, Ariz. — traditionally the highest-volume port for the state of Sonora. Industry leaders hope Nogales is added soon to provide a safety net if Douglas is closed.
Why Mexican Cattle are Vital to Southwest Feeders
The border closure left a massive void in the Southwest beef industry, where local dynamics differ greatly from the Midwest or Plains. In regions like California’s Imperial Valley, feeders rely heavily on Holstein and dairy-cross calves. Mexican feeder cattle provide a critical alternative.
“What the Mexican cattle do is they provide a nice diversity,” says Mike Sulpizio, California Cattlemen’s Association feeder council chair and Superior Cattle Feeders cattle buyer and marketing manager. He says multiple feedlots in the Imperial Valley feed the Mexican cattle.
Beyond the feedlots, light Mexican calves (typically weighing 350 to 450 lb.) are essential stocker cattle for Arizona and California ranchers. These calves utilize winter pastures, which also plays an environmental role. Eade says the Mexican stocker cattle help with fire prevention by grazing down heavy fuel loads on seasonal pastures.
Economic Friction and Market Outlook
The yearlong border closure has forced significant structural shifts on both sides of the border. U.S. cattle feeders are bracing for an initial wave of heavier-than-normal cattle because animals have been held on Mexican ranches for months.
While the gates are opening, do not expect a massive flood of cheap cattle immediately. A year of zero exports has left Mexican feedlots overstocked, and Mexican producers are eager to capture peak U.S. prices. However, experienced brokers are preaching patience.
“The Mexican naturally wants more money, but my customers don’t want to pay more than what a break-even will justify,” Teran says.
Teran plans to sit on the sidelines for the first week to let the market establish realistic pricing.
Additionally, the long-term landscape of Mexican trade has changed. During the year-long closure, Mexican processing giants like SuKarne expanded their domestic feedlot capacity and began exporting more boxed beef and whole carcasses directly into the U.S.
“They are going to be a competitor of ours moving forward, I believe,” Sulpizio notes. “In five years, I don’t see us being back at levels that we were before by any means.”
For many in the beef industry, the reopening of the Port of Douglas is a massive sigh of relief. While the process will start slow, face logistical hurdles with new EID scanning on-site and require tight vigilance, it signals a return to crucial commerce for feeders and stocks in the Southwest. Backed by state-of-the-art biosecurity, U.S. cattle feeders and ranchers can once again safely leverage high-quality Mexican genetics to diversify their operations.
