The average price of diesel fuel in the United States went above $5 per gallon on July 16, 2026, up from $4.9380 just one day earlier, according to AAA data. Regular gasoline is nearing $4 per gallon. The jump comes after Iran announced earlier this week that the Strait of Hormuz is closed to shipping, a decision that has shaken global energy markets and pushed crude oil to roughly $81 per barrel.

The Strait of Hormuz is a narrow strip of water at the mouth of the Persian Gulf. About one-fifth of all the oil the world uses each day passes through it. You can think of it as a narrow bridge on a busy highway: if the bridge closes, a huge portion of traffic has nowhere to go. Before this week, both Iran and the United States had said they would keep ships safe traveling through the strait. That arrangement collapsed when Iran declared the strait shut, and the US responded by announcing a blockade on all ship traffic to or from Iranian ports.

The escalation happened fast. On Monday, July 13, President Trump said the United States would take over the Strait of Hormuz and charge a fee equal to 20% of the value of any cargo passing through. He later dropped that plan. Over the next several days came an Iranian shutdown declaration and then a US counter-blockade. The result is that the legal and operational status of one of the world's most important shipping lanes is now unclear.

The AAA national averages as of July 16, 2026, show the impact across fuel types. Regular gasoline sits at about $4 per gallon, up from $3.8900 on July 15. Mid-grade gasoline averages $4.4480, premium averages $4.8290, and diesel has crossed $5 to reach $5.0050. E85, a fuel made partly from corn-based ethanol, remains the cheapest option at $3.0330.

Diesel prices over the past month have bounced around rather than climbing steadily. On June 16, the AAA national average for diesel was $5.1850, which is actually higher than today. It then fell to $4.8100 by July 9 before jumping more than 19 cents over the following week. The one-day leap from $4.9380 to $5.0050 between July 15 and July 16 lines up with the worsening Hormuz crisis.

Historical Context and Comparisons

Today's diesel price of $5.0050 is still below the all-time AAA national average record of $5.8160 set on June 19, 2022. Regular gasoline is well below its record of $5.0160 from June 14, 2022. But compared to a year ago, the change is large: on July 16, 2025, diesel averaged $3.72 per gallon and regular gasoline averaged $3.16. Today's regular price is about $0.84 higher than a year ago, and diesel is up about $1.28.

Fuel prices in recent months have followed the ups and downs of US-Iran tensions. In late April 2026, AAA reported a jump of nearly 30 cents in the national average for regular gasoline in a single week because oil prices were spiking. By early May, the average passed $4.50 for the first time since July 2022. Memorial Day weekend saw a four-year high of $4.56 per gallon, which was $1.38 above the same holiday in 2025.

Prices then dropped through June as Washington and Tehran worked toward a long-term deal, with AAA reporting that crude oil prices were falling. The national average for regular gasoline fell below $4 on June 18, reaching $3.99, its first reading under $4 since March 30, 2026. The Associated Press said the decline was due to a 15% drop in US crude prices. By June 25, AAA reported the average at $3.91, staying below $4 for a second straight week. Reuters noted a sixth consecutive week of declining prices on June 22, at $3.85.

That downward trend has reversed sharply. By July 3, GasBuddy projected a July 4 average of about $3.75. Two weeks later, on July 14, Reuters reported the national average had risen to $3.84, up 9.8 cents in a week. AAA's July 16 figure of nearly $4 per gallon for regular continues that climb, and diesel has now gone above $5.

Regional Variation

Fuel prices vary a lot depending on where you live. In Alaska, AAA reports regular gasoline at $4.6710, mid-grade at $4.9090, premium at $5.0990, and diesel at $5.2440. Alabama's regular average is $3.5880. Colorado shows regular at $3.8840, mid-grade at $4.2880, premium at $4.6350, and diesel at $4.6310. The District of Columbia's record averages, from June 2022, are still the highest on record: $5.2620 for regular unleaded and $6.2280 for diesel.

What Comes Next

The broader question is whether the Hormuz shutdown and the US blockade are temporary bargaining chips or a lasting disruption to global shipping. The June price decline happened because people expected a US-Iran deal; this week's reversal suggests those hopes have faded. Both the Iranian closure and the American blockade have been announced, but how either would actually be enforced remains unclear. That gap between what has been declared and what can actually be done is where energy markets will find their next direction.

For American consumers and the trucking industry, diesel above $5 matters a lot. Diesel fuels the trucks that deliver goods, the machinery used in farming, and the equipment in factories. If the price stays this high, it pushes up the cost of moving goods around, which can feed into broader inflation at a time when the Federal Reserve is already dealing with competing pressures. Crude oil at about $81 per barrel has not yet jumped to levels that would suggest full market panic, but it has moved well above the lows that made June's lower prices possible.

The Trump administration's quick withdrawal of the cargo toll plan suggests it recognizes the political and economic risks of a prolonged Hormuz disruption. Whether that recognition leads to a real de-escalation or just a temporary pause is the open question facing oil markets, shipping insurers, and anyone filling up at the pump.