California is the largest milk-producing state in the US, generating enough raw milk volume that the processing infrastructure required to handle it has become a competitive advantage in its own right. If you’re sourcing a co-manufacturer for fluid milk, cheese, whey ingredients, UHT beverages, or cultured dairy, California’s supplier landscape offers options at nearly every scale and specialization level. This guide covers the ten most relevant players, with enough operational detail to help you evaluate fit before your first call.
1. California Dairies, Inc. (CDI)
Best for: Bulk dairy commodities, ESL/UHT beverages, nutritional ingredients, private label shelf-stable milk
CDI is the largest dairy cooperative in California, co-owned by approximately 300 family dairy farms that collectively ship 17 billion pounds of milk annually — roughly 40% of the state’s total raw milk production. That volume guarantees consistent supply, which is the primary reason large private label buyers partner with them.
The cooperative operates six manufacturing facilities across the Central Valley. Its Visalia plant houses the largest single evaporator-dryer in North America, making it a dominant player in milk powder and butter production. Its Turlock North facility produces lactoferrin, a high-value bioactive ingredient used in infant formula and immune health products.
The most significant recent development is Valley Natural Beverages (VNB), CDI’s $200 million greenfield facility in Bakersfield. VNB uses steam infusion UHT technology — a gentler heat treatment than direct steam injection — which eliminates the “cooked” flavor typically associated with shelf-stable milk. For private label brands that need UHT or ESL products without compromising sensory quality, VNB is one of the few facilities in the US that can deliver this at commercial scale.
Key facilities: Visalia, Fresno, Tipton, Turlock North, Turlock South, Bakersfield (VNB)
2. Leprino Foods
Best for: Mozzarella, pizza cheese, whey protein, industrial cheese formats
Leprino is the world’s largest producer of mozzarella cheese and controls approximately 85% of the US pizza cheese market. Its California operations are centered in Tracy and Lemoore. The company’s patented pasta filata process — a specific method of heating and stretching cheese curd — produces a product engineered for consistent melt, stretch, and browning performance in high-heat pizza ovens.
For food manufacturers and converters, Leprino offers proprietary industrial formats. “Ribbon” cheese is designed for high-speed shredding lines, eliminating manual processing steps. “Precision Melt” is formulated for enrobed bakery and snack applications. These formats reduce processing time for buyers operating continuous manufacturing lines.
Whey protein, lactose, and micellar casein are byproducts of the cheesemaking process that Leprino has commercialized into a significant revenue stream, supplying infant formula and clinical nutrition manufacturers globally.
Key clients: Pizza Hut, Domino’s, Papa John’s, DiGiorno, Hot Pockets
3. Hilmar Cheese Company
Best for: Natural cheese in bulk formats, whey ingredients, pharmaceutical-grade lactose, co-development with private label clients
Hilmar processes 12.5 million pounds of milk daily at its single-site facility in Hilmar, California — one of the highest single-site volumes in the world. The milk comes from over 280 dairies, with approximately 20% sourced from Jersey cows, which produce milk with higher solids content and is therefore more efficient for cheesemaking.
The company’s ingredient division produces whey protein concentrates, whey protein hydrolysates, and multiple grades of lactose including pharmaceutical-grade, which is used as an excipient in tablet manufacturing. This lactose is exported to over 50 countries.
Hilmar’s Innovation Center includes a pilot plant and commercial kitchen where their R&D team works directly with private label clients to develop custom cheese formulations. Varieties span American classics (cheddar, Monterey Jack), European styles (mozzarella, provolone, romano), and Hispanic styles (queso quesadilla, asadero). Their HilmarConnect Global platform gives wholesale partners real-time access to cheese availability and pricing.
Cheese formats: 40 lb and 640 lb blocks
4. Valley Natural Beverages (VNB)
Best for: ESL and UHT shelf-stable dairy beverages, private label ultra-filtered milk, aseptic co-packing
VNB operates as a division of CDI but warrants a separate entry because its capabilities are distinct from CDI’s commodity-focused plants. The 200,000-square-foot Bakersfield facility was built as a greenfield site with Industry 4.0 infrastructure, including a fully automated lights-out warehouse with 8,400 pallet positions managed by robotic cranes and shuttles.
The facility produces ESL and UHT beverages in Tetra Pak and Elopak formats, including ultra-filtered white milk, flavored milk, dairy creamers, and lactose-free products. For co-packing partners, the lights-out warehouse translates directly into lower storage costs and more precise inventory management.
On the sustainability side, VNB’s location in Kern County eliminates approximately 312,000 ranch-to-plant transport miles annually. An on-site methane digester converts organic waste into renewable fuel used for heat treatment and cleaning systems, which reduces the GHG intensity attributable to products manufactured there — a relevant claim for brands with sustainability commitments.
5. Ninth Avenue Foods
Best for: ESL and aseptic UHT beverages, plant-based co-packing, allergen-segregated runs, private label organic milk
Ninth Avenue Foods, based in Industry, California, is one of the most technically specialized ESL and aseptic beverage co-packers in the Western US. The company uses direct steam injection UHT systems and holds SQF Level 3 certification, which is the highest level in the Safe Quality Food program and a prerequisite for supplying major national retailers.
Its filling capacity covers ESL bottles from 8 oz to 52 oz and gable top cartons from 8 oz to 64 oz, which means it can service both single-serve and family-size SKUs in the same relationship. Ninth Avenue Foods also co-packs soy, almond, nut, and flax milk blends, and its CIP (clean-in-place) procedures allow allergen segregation between dairy and non-dairy runs — a capability that many co-packers in this category cannot offer.
A notable 2026 development: Ninth Avenue Foods is launching Aseptic PET packaging, which combines the shelf-stability of UHT products with the consumer appeal and visual clarity of clear plastic bottles. This format is expected to compete directly with refrigerated products on retail shelves. The company is also expanding nationally, with new facilities in Longview, Texas, and Indiana.
6. Saputo Cheese USA (Tulare, CA)
Best for: Comprehensive contract manufacturing across multiple dairy categories, cultured dairy, aerosol whipped toppings, co-manufacturing with R&D support
Saputo ranks among the top ten dairy processors globally and operates a significant facility in Tulare, California. Its contract manufacturing arm, Saputo Production Solutions, covers a wide product range: aerosol whipped toppings, cottage cheese, sour cream, nutritional beverages, plant-based milks, coffee creamers, and bulk whey protein.
The differentiator for mid-size private label brands is Saputo’s integrated R&D support. Their culinary and formulation teams work from a fully equipped test kitchen in Dallas and offer sensory testing services, which means clients without their own R&D infrastructure can develop custom dairy formulas before committing to a commercial run.
Packaging flexibility is another strength: they offer portion control cups, stick packs, Tetra Pak (330 ml), gable top, and bag-in-box for foodservice — which allows brands to serve retail, foodservice, and industrial channels from a single manufacturer relationship.
7. Producers Dairy
Best for: Fresh fluid milk, organic private label, local sourcing claims, same-day bottling
Producers Dairy is based in Fresno with a second private-label plant in Fairfield. Their member farms are located an average of 26 miles from the Fresno processing plant, which supports same-day bottling — a meaningful differentiator for brands that need to substantiate “fresh” or “local” claims with verifiable sourcing data.
The company produces HTST-pasteurized fluid milk, organic USDA-certified milk, ice cream, and cultured products. The organic line adheres to animal welfare and feed standards required for USDA Organic certification. For regional premium private label brands, Producers Dairy fills a gap that the large-scale cooperatives and commodity processors don’t address: high-quality, locally sourced, fresh dairy with a shorter supply chain.
8. Crystal Creamery
Best for: Cultured dairy private label (cottage cheese, sour cream), ice cream, SQF-certified co-packing
Crystal Creamery, headquartered in Modesto, operates two processing plants and specializes in cultured dairy and ice cream for private label and foodservice clients. They hold SQF and HACCP certifications and offer commercialization support for retailers launching new dairy SKUs. Their focus on the cultured category — specifically cottage cheese, sour cream, and premium ice cream — makes them a relevant partner for grocery retailers building out private label dairy programs in those segments.
9. Scott Brothers Dairy
Best for: Private label frozen yogurt and specialty frozen dessert mixes, non-dairy alternatives, artisan bases
Scott Brothers Dairy in Chino, California, is recognized as the world’s largest manufacturer of private label frozen yogurt. With over 100 years of operating history, the company produces a range of frozen dairy and non-dairy mixes, including soft-serve bases, liquid nitrogen (LN2) artisan bases, and probiotic yogurt lines. Their non-dairy mix portfolio is growing in response to demand for vegan foodservice options.
For specialty dessert brands and foodservice operators who need custom frozen formats, Scott Brothers offers a level of category depth that general dairy co-manufacturers do not.
10. Stremicks Heritage Foods / California Sunshine
Best for: Organic ESL milk, aseptic creamers, plant-based co-packing (soy, rice, almond), WIC-certified products
Stremicks Heritage Foods has operated in the organic dairy and aseptic beverage space for over 30 years. Their California Sunshine brand produces organic ESL milk with a shelf life of 77 days and aseptic creamers with shelf lives up to 214 days. Three manufacturing facilities handle both dairy and plant-based beverages including soy, rice, and almond milk.
Their 8th Continent soy brand offers vegan, kosher, and WIC-certified options, making Stremicks a viable partner for brands that need to meet WIC program specifications. For private label brands managing inventory across wide geographies or for export, the extended shelf-life capabilities are the primary operational advantage.
How to Evaluate a California Dairy Co-Manufacturer
When shortlisting a California dairy co-manufacturer, four criteria determine whether a manufacturer can actually support your program:
Processing technology: HTST gives you 14–21 days of shelf life. Ultra-pasteurization (ESL) extends that to 70–85 days. UHT aseptic production gives you 6–12 months without refrigeration. Your logistics model and distribution footprint should determine which processing method you actually need before you evaluate suppliers.
Certifications: SQF Level 3 is required by most major national retailers. HACCP is the baseline. Organic (USDA), kosher, and WIC certification matter depending on your channel.
Volume and format flexibility: Some manufacturers in this list only work in large commodity volumes. Others support multi-SKU private label runs with frequent changeovers. Match your projected volume to the manufacturer’s operational model.
Co-development support: If you don’t have internal R&D, manufacturers with pilot plants and test kitchens (Hilmar, Saputo) let you iterate on formulations before committing to production runs.
