Fremont Brewing's Barrel Aged Series is a celebrated line of limited-release craft beers from Seattle, Washington, offered in 22oz wax-top bottles. The flagship release is the Dark Star Barrel Aged Imperial Oatmeal Stout, a rich and complex brew aged in 7-12-year-old Kentucky bourbon barrels. Costco sells this as a single-bottle limit per member, reflecting its high-demand, collectible nature.

Dark Star is brewed with 2-Row Pale, Roast Barley, Crystal-60, Chocolate, and Carafa-2 malts along with Flaked Oats and Columbus, Willamette, and Cascade hops. The beer clocks in at approximately 14.8% ABV and 50 IBUs. Roasted and chocolate malts complement smooth oats, balanced by bourbon barrel warmth and a touch of sweetness. The series is typically a blend of barrels aged at 8, 12, 18, and 24 months.

This beer has earned numerous accolades including Platinum at the 2022 and 2023 World Beer Championships (Barrel Aged Imperial Stout category), Gold at the 2016 Brussels Beer Challenge, and Champion Gold at the 2014 Sip Northwest Best Barrel-Aged competition. Must be 21 or older to purchase.