Primapressa

The Index / Brands

Does Kirkland Signature tell you when it was harvested?

No — best-by date only. You cannot tell how old this oil is from the label.

Published lab results: None found in our research.

Research notes: Costco house brand. Labels show best-by dates only; no published harvest dates or lot chemistry found. Desk research July 2026.

Evidence: Retailer site (checked 2026-07-04)

Work at Kirkland Signature and think this is wrong or out of date? Send lot data to hello@primapressa.com — we regrade on evidence, and we publish updates.

Kirkland Signature oils on the Index