July and August should be two of the busiest months ever seen for imports at the nation’s major retail container ports, possibly setting a new record as merchants enter the back-to-school season and begin to stock up for the holiday season that will follow, according to a new forecast from the National Retail Federation, a retail trade association.

Ports covered handled 1.72 million twenty-foot equivalent units in May, the latest month for which after-the-fact numbers are available. That was up 7.3% from April and up 6.2% from May 2016. One TEU is one 20-foot-long cargo container or its equivalent.

“We’re expecting retailers to import some of the largest volumes of merchandise ever,” NRF Vice President for Supply Chain and Customs Policy Jonathan Gold said. “That’s a good indicator of what could be ahead for consumer demand and retail sales, and it’s a sign that retail is going strong despite what you might read in the headlines.”

 June was estimated at 1.66 million TEUs, up 5.3% from the same time last year. July is forecast at 1.71 million TEUs, up 5.1% from last year; August at 1.75 million TEUs, up 2.2%; September at 1.66 million TEUs, up 4.3%; October at 1.71 million TEUs, up 2.2%, and November at 1.6 million TEUs, down 2.7% from last year.

The August figure would be the highest monthly volume recorded since NRF began tracking imports in 2000, topping the 1.73 million TEUs seen in March 2015. The 1.7 million-plus numbers seen in May, July, August and October represent four of the six busiest months in the report’s history.

The first half of 2017 is expected to total 9.63 million TEUs, up 7.1% from the first half of 2016. Cargo volume for 2016 totaled 18.8 million TEU, up 3.1% from 2015, which had grown 5.4% from 2014.

NRF has forecast that 2017 retail sales – excluding automobiles, gasoline and restaurants – will increase between 3.7% and 4.2% over 2016, driven by job and income growth coupled with low debt.

It noted cargo volume does not correlate directly with sales because only the number of containers is counted, not the value of the cargo inside, but nonetheless provides a barometer of retailers’ expectations.

Hackett Associates Founder Ben Hackett, an economist who prepares the report for NRF, said the increases in imports have come despite threats by the Trump administration to impose new limits on international trade.

“Some actions to date appear to have alienated traditional allies and are causing them to work more closely together, leaving the United States on the sidelines,” Hackett said. “‘America First’ may well result in protectionist actions that will cut the United States off from the benefits of the global value chain and economic growth for U.S. importers and exporters.”

The report covers the U.S. ports of Los Angeles/Long Beach, Oakland, Seattle and Tacoma on the West Coast; New York/New Jersey, Hampton Roads, Charleston, Savannah, Port Everglades and Miami on the East Coast, and Houston on the Gulf Coast.