Maine’s average price for regular gasoline has risen to its highest point since August 2022 as the conflict in Iran continues to drive up global oil costs.

A gallon of regular gas averaged $4.03 here Tuesday, ticking up more than 6 cents overnight, according to data aggregated by motor club AAA. That price has risen 38.5% — about $1.12 — since Feb. 28, when the United States and Israel struck Iran, triggering a conflict that has since spilled into the broader Middle East.

Premium gas was up to $5.07 per gallon in Maine, topping $5 for the first time in nearly four years. Diesel, meanwhile, averaged about $5.90 per gallon Tuesday.

Collectively, those figures mark the state’s highest average gas prices since the summer of 2022, when the Russian invasion of Ukraine drove gas prices to record highs. A gallon of regular gas peaked at $5.09 that June, the highest ever recorded by AAA.

For more than five weeks, the conflict in the Middle East has sent shockwaves through international oil and stock markets. Following the initial strikes, Iran closed the Strait of Hormuz, a crucial shipping passage through which roughly one-fifth of the world’s oil typically flows.

President Donald Trump ramped up his threats against Iran late last week, vowing to destroy the country’s bridges and power plants if it did not reopen the strait by Tuesday. That threat came in an expletive-laden social media post over the weekend.

Trump then re-upped the threat in a Tuesday morning post, saying that evening would mark “one of the most important moments in the long and complex history of the world.”

“A whole civilization will die tonight, never to be brought back again,” he wrote shortly after 8 a.m.

Later in the morning, officials told The Associated Press that the United States had struck Kharg Island, a major Iranian oil hub, overnight. The Israeli military also said it had struck bridges in five cities, which it said Iranian forces were using to transport weapons and equipment, the AP reported.

This week, Maine’s gas prices were the 21st highest among the 50 states and Washington, D.C., according to AAA. California, Hawaii, Washington, Nevada and Oregon all saw average prices above $5 per gallon Tuesday.

Maine’s average price crossed the $4 threshold a week after the national average did so. The national average was up to $4.14 Tuesday, AAA data shows.