⛽ Costco Gas Prices in Washington
Estimated today · Based on Washington AAA avg · Source: AAA + historical Costco savings data
Washington Avg Today
—
per gallon · regular
Est. Costco Price
—
~15–30¢ below state avg
⚠️ Costco does not publish real-time prices. Estimated price uses today's Washington AAA average minus Costco's typical 15–30¢/gal savings. Actual prices vary by location.
Washington Gas Tax Context
Washington's state gas tax is approximately 49¢ per gallon — above the national average. This tax applies equally to all stations including Costco, so the 15–30¢ membership discount is on top of the post-tax street price. In high-tax states like Washington, the absolute price at the pump is higher, but the relative savings from a Costco membership remain the same.
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~30 Costco locations in Washington
Use the Costcoapp or website to find the nearest fuel center and confirm today's price.
Membership required
Costco fuel is available to members only. $65–$130/year · Gold Star ($65/year)
Costco Gas in Washington — FAQs
How much is gas at Costco in Washington today?
Based on today's Washington average of current local prices, Costco in Washington is estimated at around $a few cents less per gallon. Costco typically prices 15–30¢ per gallon below the state average.
Is Costco gas cheaper than regular gas stations in Washington?
Yes. Costco gas in Washington is typically 15–30¢ per gallon cheaper than branded stations. Washington has relatively high state gas taxes (~49¢/gal), which affects all stations equally — the Costco discount still applies on top of that base.
Do you need a membership for Costco gas in Washington?
Yes. A valid Costco Membership ($65–$130/year) is required to purchase fuel at any Costco location, including those in Washington.
Why is gas more expensive in Washington than the national average?
Washington gas prices are currently near the national average of $—. State gas tax is approximately 49¢/gal.