Why prepared meals and perishable foods aren't part of the cottage food program — and the alternative paths available to you.
A TCS food is any food that requires temperature control — keeping it hot enough or cold enough — to prevent the growth of harmful bacteria. These foods contain enough moisture, protein, and nutrients to support dangerous pathogens like Salmonella, Listeria, E. coli, and Clostridium botulinum if held at the wrong temperature for too long.
The concept behind TCS is straightforward: certain foods become unsafe if they spend too much time in the "danger zone" — temperatures between 41°F and 135°F. Bacteria can double in number every 20 minutes in this range. That's why restaurants keep hot food above 135°F and cold food below 41°F, and why health codes limit how long food can sit at room temperature.
Common TCS foods include cooked meats, dairy products, cooked rice and pasta, cut fruits and vegetables, cream-based sauces, and any food containing eggs, milk, or meat. These are exactly the types of products that Washington's cottage food program prohibits — because a home kitchen, without commercial temperature monitoring equipment, introduces too much risk.
| Temperature Zone | Range | What Happens |
|---|---|---|
| Safe Hot Zone | 135°F and above | Bacteria are killed or can't multiply. Hot-held food must stay here. |
| Danger Zone | 41°F – 135°F | Bacteria multiply rapidly. Food should not remain here for more than 2–4 hours total. |
| Safe Cold Zone | 41°F and below | Bacteria growth slows dramatically. Refrigerated food must stay here. |
| Frozen | 0°F and below | Bacteria growth stops. Food is preserved but must be thawed safely. |
Washington's cottage food statute is explicit: only foods that are safe at room temperature qualify. This eliminates nearly all prepared meals, since most involve cooked proteins, dairy, fresh produce, or other perishable ingredients that require temperature control.
Here are the specific product categories the cottage food program prohibits that commonly fall under "prepared meals":
It's worth noting that some of these products (like pickles, sauces, and fermented foods) might technically be shelf-stable if prepared correctly. Washington's cottage food program still excludes them because the processes involved — canning, acidification, fermentation — introduce safety risks that the program's framework isn't designed to manage. These categories require specialized knowledge, equipment, and testing beyond what a standard home kitchen setup provides.
If your goal is to sell prepared meals, TCS foods, or products in the prohibited categories, you're not out of luck — you just need a different license. Washington offers several pathways depending on what you want to make and sell.
This is the most common next step for cottage food sellers who want to expand beyond shelf-stable products. A Food Processing Plant License allows you to produce a much wider range of food products, including those that require temperature control. You'll need a facility that meets commercial kitchen standards, pass a WSDA inspection, and comply with additional food safety regulations. There's no sales cap. Apply through WSDA Food Safety Applications.
If you don't want to build out your own commercial kitchen, you can rent time in a shared commercial kitchen (sometimes called a commissary or incubator kitchen). These facilities are already licensed and inspected, so you can use them under your WSDA Food Processing Plant License. Several shared kitchens operate around the Puget Sound area and in larger Washington cities. Search for "shared commercial kitchen" in your area, or ask your local economic development office for recommendations.
If you want to sell prepared meals directly to consumers — more like a restaurant or catering operation — you may need a food service establishment permit through your local county health department rather than WSDA. This pathway applies if you're cooking and serving food on-site (like at events or from a food truck) rather than manufacturing packaged products. Contact your local health jurisdiction for specific requirements.
Even though TCS foods aren't allowed under the cottage food program, understanding temperature safety is important for every food seller. Some cottage food products involve cooking steps — like candies that require candy thermometer monitoring, or baked goods that must reach specific internal temperatures. And if you eventually transition to a commercial license, temperature control will be central to your operations.
The FDA Food Code — which Washington's food safety rules are based on — establishes clear temperature requirements for food safety. Cold foods must be held at 41°F or below. Hot foods must be held at 135°F or above. Food should move through the danger zone (41°F–135°F) as quickly as possible during cooking and cooling. Cooling is especially critical: food must go from 135°F to 70°F within 2 hours, and from 70°F to 41°F within an additional 4 hours.
Even if you're only making shelf-stable products, proper cooking temperatures matter. Candies must be cooked to specific temperatures to achieve the right sugar concentration and water activity. Baked goods need adequate baking times and temperatures to eliminate any pathogens in raw ingredients like flour and eggs. Your WSDA-reviewed recipes should specify these details — follow them precisely.
Find out whether your prepared meal or food product qualifies as TCS in Washington — and discover which license pathway fits your plans.
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