What Makes a Food Shelf-Stable?
California cottage food law is restricted to non-potentially hazardous foods — the regulatory term for products that do not support rapid bacterial growth when stored at room temperature. In plain English: food that is safe to leave on a pantry shelf without refrigeration. Understanding this classification is the key to knowing what you can and can't sell.
Food safety scientists use two measurable properties to determine shelf stability. A food qualifies as non-potentially hazardous when its water activity (Aw) is at or below 0.85 and its pH is below 4.6. Meeting both criteria means bacteria that cause foodborne illness — including Salmonella, E. coli, and Listeria — cannot multiply fast enough to pose a safety risk at ambient temperatures.
Shelf-Stable in Practice — What This Looks Like
- A bag of granola with 3% moisture and no added water: shelf-stable
- A jar of strawberry jam made to 21 CFR Part 150 with 65°+ Brix: shelf-stable
- Shortbread cookies with less than 5% moisture: shelf-stable
- Roasted coffee, dried herbs, dried pasta: shelf-stable
- A buttercream cake with fresh fruit: requires refrigeration — not shelf-stable
- Cream cheese frosting: requires refrigeration — not shelf-stable
- Homemade salsa, even if vinegary: pH control must be verified in a lab — not allowed under cottage food
- Kombucha: live fermentation and variable alcohol content — requires separate assessment [VERIFY with CDPH]
California does not ask sellers to measure or verify their own Aw or pH values. Instead, the CDPH Approved Cottage Foods List acts as the pre-vetted shelf-stability guide — if your product matches a category on the list, it qualifies. This makes the system simpler than self-certifying food safety metrics, but also more restrictive: you cannot sell a product just because you've measured its pH as safe. It must be on the list.
California's Sales Caps
California is one of the few states with inflation-adjusted sales caps — the limits grow automatically each year in line with the California Consumer Price Index (CPI), so your earning ceiling increases without requiring new legislation. The base caps were set at $75,000 (Class A) and $150,000 (Class B) by AB 1144 in 2021.
What Counts Toward Your Cap?
- The selling price of every cottage food product you sell
- Shipping fees charged to buyers (if you charge separately for shipping)
- Sales tax collected does not count toward your cap
- Non-cottage food income (e.g., teaching classes, selling supplies) does not count
What Happens When You Hit the Cap?
Your cottage food registration or permit does not automatically expire, but you are legally required to stop selling cottage food once you reach your annual limit. Exceeding the cap while still operating as a CFO is a violation of the California Health and Safety Code. Your options at that point:
Where You Can Sell in California
California's cottage food framework is notably flexible in where you can sell — both classes allow online sales, farmers markets, and third-party delivery that many states prohibit. The key restriction is geography: all sales and deliveries must remain within California.
From Your Home
Open · Both ClassesSell directly to customers who visit your home. No additional permit needed beyond your CFO registration.
Farmers Markets
Open · Both ClassesAttend any certified farmers market in California. Most markets accept cottage food vendors. No limit on how many markets you attend.
Events & Festivals
Open · Both ClassesHoliday bazaars, bake sales, food swaps, community events, and pop-up markets are all permitted sales venues.
Online Sales
Open · Both ClassesTake orders through your website, social media, or online marketplaces. Delivery or shipping must stay within California.
Shipping (In-State)
Open · Both ClassesShip via USPS, UPS, FedEx, or other carriers to California addresses. Shipping outside California is prohibited — interstate commerce rules apply.
Third-Party Delivery
Open · Both ClassesPlatforms like DoorDash, Postmates, and UberEats are permitted delivery channels — a distinction that sets California apart from many states.
Retail Stores & Grocery
Class B OnlySell to local grocery stores, gift shops, and other retailers. Requires Class B permit and home kitchen inspection. Statewide since 2022.
Restaurants & Cafés
Class B OnlyRestaurants can purchase your cottage food products as ingredients. They must inform customers on their menu that homemade items are included.
Out-of-State Shipping
Not PermittedProhibited for all CFOs. Selling across state lines is interstate commerce, which falls under FDA regulation — not California's cottage food exemption.
Storage & Handling in Your Home Kitchen
Whether you are Class A or Class B, California law sets specific sanitation and operational requirements for your home kitchen during production. These aren't inspected upfront for Class A sellers (you self-certify), but county Environmental Health officers can and do conduct follow-up inspections after complaints — and Class B sellers receive annual inspections.
No Concurrent Domestic Activity
During food prep, no laundry, dishwashing, kitchen cleaning, or meal preparation for your family. One activity at a time.
No Pets or Small Children
Pets and small children must be out of the kitchen during all food preparation, packaging, and handling.
Sanitize Before Every Use
All food-contact surfaces, equipment, and utensils must be washed, rinsed, and sanitized before each production session.
Potable Water Required
Only safe drinking water from a municipal system or tested private well may be used. Well water requires quarterly bacterial testing.
Primary Residence Only
Production must occur in your primary home — where you actually live. Second homes, vacation properties, and RVs do not qualify.
Store in Your Home
All cottage food products and related ingredients must be made and stored within your registered home. No off-site storage facilities.
No Sick Workers
Any person with a contagious illness must stay out of the kitchen. This applies to the operator, employees, and helping family members.
Pest-Free Environment
All food prep, storage, and equipment storage areas must be maintained free of rodents, insects, and pests at all times.
California Sales Limit Tracker
Log your sales and automatically track your progress against California's annual cap — with alerts when you're approaching your Class A or Class B limit.
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