Costco is expanding the availability of Kirkland Signature grass-fed butter beyond its previous New Zealand-only supply by adding Irish production through dairy co-op Tirlán. For U.S. Costco members buying the warehouse staple, the change shifts the butter's origin while keeping the same private-label product in Costco's lineup.
Costco's website now identifies the butter as coming from New Zealand or Ireland, and the wrapper no longer includes tablespoon guides for home kitchen measuring. Tirlán also supplies Ornua, the company behind Kerrygold, so the contract places a lower-priced Kirkland option alongside Irish-branded butter.
A Kirkland butter priced below Kerrygold widens Costco's opening in a category where Americans bought 6.8 pounds per person in 2024. The Irish supply deal also shifts pressure upstream, as farmers' groups there expect private-label competition to squeeze milk payments.
Image Credit: Kirkland Grass-Fed Butter
What's Driving This Trend
- Private-label Premiumization
- Retailers are reshaping premium grocery categories by offering store-brand products with provenance cues that rival established specialty brands at lower prices.
- Origin-based Value Positioning
- Country-of-origin labeling is becoming a competitive lever as shoppers associate specific regions with quality, sustainability, and authenticity in everyday staples.
- Dairy Supply Diversification
- Global sourcing flexibility is creating new resilience for high-volume grocery products while intensifying price pressure across regional producer networks.
Who This Affects Most
- Grocery Retail
- Warehouse clubs and mass retailers are expanding control over premium private-label assortments to capture margin and loyalty in frequently purchased food categories.
- Dairy Production
- Co-ops and processors are increasingly exposed to large retailer contracts that can scale volume quickly while altering payment dynamics for farmers.
- Packaged Foods
- Branded butter and staple food companies face heightened competition as retailer-owned labels adopt quality signals once reserved for national brands.
