King County’s lowest diesel gas price recorded at $6.29 for week ending Apr. 25

Laura V. Swett, Chairman of Federal Energy Regulatory Commission (FERC)

Apr 30, 2026

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King County had one gas station selling diesel gas at the lowest price of $6.29 per gallon during the week ending Apr. 25, according to customer reports submitted to GasBuddy.

The average reported price of diesel gas across the county was $7 per gallon.

Of the 512 reported gas stations in cities within King County, 242 offered diesel gas.

The statewide average price of diesel gas in Washington was $6.81 per gallon for the week ending Apr. 25, an increase from the previous week.

According to an analysis by Time Magazine, fuel prices remain elevated and volatile as global oil markets react to geopolitical developments tied to the U.S. conflict with Iran, with supply concerns focused on potential disruptions in the Strait of Hormuz. As of mid-April, the national average for gasoline remains above the $4-per-gallon mark, while diesel exceeds $5.60, reflecting recent swings driven by a temporary ceasefire and subsequent renewed escalation. Analysts say prices are likely to rise further in the near term as uncertainty persists and supply risks remain, with additional increases expected unless shipping flows through key transit routes are restored.

Gas price data reflects cash payments. Some stations may charge higher prices for credit card transactions due to processing fees, though such surcharges are prohibited in some states and territories.

Lowest Reported Diesel Gas Prices in Cities Associated With King County in Week Ending Apr. 25

Information in this article was obtained from GasBuddy. The source data can be found here.