Gas prices in Moses Lake and Grant County rose this week, with the average price for a gallon of regular unleaded gasoline increasing from $5.00 to $5.03 per gallon in Grant County as of August 3, according to AAA data. Meanwhile, Adams County saw a slight decrease from $5.03 to $4.96 per gallon.
Compared to a month ago, Washington's average gas price has risen 10 cents to $5.13 per gallon, while nationally the average dropped slightly to $4.10. Washington remains one of only three states with an average price over $5 per gallon, alongside California and Hawaii. The national average has increased $1.29 from the start of 2026, and Washington drivers are paying $1.29 more per gallon than they were on January 5.