Gas prices jump more than 21 cents in past week

OLYMPIA — Average gasoline prices in Washington rose 21.7 cents per gallon over the past week, reaching $5.62 per gallon as of Monday, according to a survey of 2,666 stations by GasBuddy.

Prices are 25.3 cents higher than a month ago and $1.43 higher than the same time last year. The national average for diesel increased 21.3 cents over the past week to $5.621 per gallon.

The national average price of gasoline climbed 38.2 cents in the past week to $4.42 per gallon. That figure is up 32.6 cents from a month ago and $1.31 higher than a year ago, based on GasBuddy data compiled from more than 11 million weekly price reports covering over 150,000 stations nationwide.

Within Washington, the lowest reported price Sunday was $4.70 per gallon, while the highest reached $6.79 per gallon, a difference of $2.09.

Regional averages also increased. Prices in Tacoma rose 26.6 cents to $5.72 per gallon, Seattle increased 18.6 cents to $5.80, and Yakima rose 17.8 cents to $5.29.

Historical data shows Washington prices have remained elevated compared to national averages in recent years. On May 4, 2025, the state average was $4.19 per gallon compared to the national average of $3.12. Prices were $4.67 in 2024, $4.56 in 2023, $4.73 in 2022 and $3.38 in 2021.

Patrick De Haan, head of petroleum analysis at GasBuddy, said refinery outages contributed to sharp increases in parts of the Great Lakes region.

“Gasoline prices rose in every state over the last week, with some of the most significant and fastest increases concentrated in the Great Lakes, where states like Michigan, Indiana, Ohio, and Illinois saw sharp spikes, while Wisconsin experienced more modest gains,” De Haan said. “At the same time, diesel prices surged to new records in parts of the region, with some areas touching the $6-per-gallon mark. While refinery outages were a key driver behind those outsized increases, early signs of improvement could help ease some of the most extreme price pressures in the Great Lakes in the days ahead. Beyond the region, markets are also digesting a wave of new developments— including OPEC+ raising production for June and President Trump outlining a plan to free stranded ships— which could help restore some supply. However, with so many moving pieces, the outlook remains highly fluid, and while some localized relief may emerge, broader price volatility is likely to persist in the near term.”

GasBuddy said its data is based on frequent updates from a combination of user reports, station data and transactional information.