Costco Grocery Prices in Washington
Washington grocery prices are +6% above the national average. Costco members save an additional 15–30% on top of that.
Washington cost of groceries
+6% vs national avg
Costco savings vs supermarket
15–30%
Est. weekly savings in Washington
$36.57
on a ~$159 cart
Est. annual savings
$1902
Washington Grocery Cost Context
Washington grocery prices are close to the national average. Costco members in Washington save 15–30% on staple groceries vs traditional supermarkets, with the biggest savings on bulk items, meat, and dairy.
Best Costco Deals in Washington
Rotisserie chickenKirkland organic eggsSalmonButterOlive oilNuts & trail mixCheeseWine
⚠️ Costco does not publish real-time prices. Savings estimates are based on Costco's typical 15–30% discount vs Washington supermarket averages. Actual prices vary by location.
Costco Membership in Washington
✓Gold Star ($65/year) — standard warehouse access
✓Executive ($130/year — 2% annual reward on purchases, extra discounts)
At ~$36.57/week in grocery savings, the $65–$130/year membership pays for itself in roughly 5 months of regular shopping in Washington.
Costco Grocery Prices in Washington — FAQs
Is Costco the cheapest place to buy groceries?
Costco is consistently among the cheapest for bulk grocery staples. Studies show Costco can be 15–30% cheaper than traditional supermarkets on comparable items. The Kirkland Signature brand specifically often undercuts even store brands at competitors while maintaining high quality.
What groceries are cheapest at Costco?
Costco's best grocery deals include: rotisserie chicken ($4.99 — a famous loss leader), organic eggs, wild-caught salmon, Kirkland butter, olive oil, coffee, nuts, dried fruit, cheese, and fresh produce. The per-unit price on most packaged goods beats standard grocery stores.
Is the Costco Executive membership worth it for groceries?
The Executive membership ($130/year) pays for itself if you spend $3,250+/year at Costco through the 2% reward. For a family of four doing regular grocery shopping, this threshold is usually easy to hit. You'd receive $65 back, making your net membership cost $65 — same as the base Gold Star.