Washington gas prices peak well above $5 per gallon before ceasefire reports The average price for a gallon of regular gas in Washington was about $5.38 on Tuesday, according to AAAShare this: National gas prices reach highest since 2022; Washington average hits $5.35 per gallonDateMarch 31, 2026In relation toKing 5 NewsWashington gas tax increases to 56.5 cents per gallon July 1DateJune 30, 2026In relation toKing 5 NewsWashington gas prices rise again amid Middle East conflict, hitting Seattle drivers and nonprofitsDateMarch 5, 2026In relation toKing 5 News