Updated March 2026.
There is no official “best Costco bourbon.” The warehouse rotates Kirkland private-label lots and national SKUs by region and week. That is a sticker, not a TTB class. If the bottle is bourbon, it still needs A 1.5-ounce pour is one NIAAA drink at 40% and 1.13 at 45%. We will not invent a 2026 Kirkland mash bill, DSP, or MSRP, read that neck.
Related: tequila at Costco, easy-to-find bourbon, Kirkland tequila.
Warehouse ≠ class
| Keep | |
|---|---|
| Kirkland bourbon | Private label; DSP/proof on that lot |
| National SKUs | Same proofs as the brand pages |
| Under-$X talk | Sticker that day |
| 1.5 oz drinks | Scale the neck |
A 1.75 L 45% handle is about 44 drinks. Four 1.5-ounce pours at 45% are about 4.5 drinks. Pour math: whiskey drinks.
Sources
- TTB 27 CFR 5.143. Kirkland bourbon producer/proof not fetched as a 2026 house PDF.
- NIAAA December 2025. No ranking or invented MSRP.