Party food safety: the 2-hour rule, buffets, coolers and leftovers
Big parties are where food safety slips: dishes sit out for hours, coolers get opened every minute, and leftovers cool slowly in deep pots. The rules are short and come from USDA’s Food Safety and Inspection Service and university extension services. Every quantity on this site is a planning estimate; these temperatures and times are not.
The 2-hour rule
Perishable food — meat, poultry, seafood, eggs, dairy, cooked rice and pasta, cut fruit, salads with dressing — should not sit at room temperature for more than 2 hours, or 1 hour when it is above 90 °F, by USDA FSIS. After that, throw it out; do not put it back in the fridge for later. Bacteria multiply quickly between 40 °F and 140 °F, which is why the clock matters even when the food looks and smells fine.
Hold hot food hot and cold food cold
| Food | Hold at | How |
|---|---|---|
| Hot dishes | 140 °F or above | chafing dishes, slow cookers, roasters, a low oven |
| Cold dishes | 40 °F or below | bowls set in ice, small batches from the fridge |
| Anything between | 2 hours at most (1 hour above 90 °F) | then discard |
For buffets, extension food-safety advice is to serve food on several small platters rather than one large one, and to replace empty platters rather than adding fresh food to a dish that has already been sitting out. Put out what will be eaten in an hour or so; keep the rest hot in the oven or cold in the fridge.
Cook to a safe internal temperature
| Food | Safe minimum internal temperature |
|---|---|
| Poultry — turkey, chicken, wings, ground poultry, stuffing in the bird | 165 °F |
| Ground beef, pork and sausage (burgers) | 160 °F |
| Beef, pork, lamb steaks, chops and roasts | 145 °F, then rest 3 minutes |
| Fresh (raw) ham | 145 °F, then rest 3 minutes |
| Precooked ham, reheated | 140 °F if packaged in a USDA-inspected plant; otherwise 165 °F |
| Fish | 145 °F, or until flesh is opaque and flakes |
| Shrimp, crab, crawfish | until flesh is pearly or white and opaque — see how much shrimp per person for a boil |
| Casseroles and leftovers | 165 °F |
A food thermometer is the only reliable test. For a turkey, check the innermost thigh and wing and the thickest part of the breast — see how long to cook a 20 lb turkey for when to start checking. Barbecue cuts like pulled pork and brisket are cooked far beyond 145 °F to become tender, but the safety line is the same.
Thawing
Thaw frozen turkeys and roasts in the refrigerator (about 24 hours per 4 to 5 lb for a turkey), in cold water changed every 30 minutes (about 30 minutes per lb), or in the microwave and then cook immediately — never on the counter. The tables are in the turkey thawing and cooking chart, and the most-asked size in how long to thaw a 20 lb turkey.
Coolers and outdoor parties
- Separate coolers for drinks and for food — the drinks cooler is opened constantly and warms up.
- Plenty of ice: Reddy Ice recommends 1 to 2 lb per guest for drinks; food coolers need their own. See how much ice for 50 people.
- Cold sides on ice: set the potato salad bowl in a larger bowl of ice, and swap in a fresh bowl — how much potato salad for 50 people covers the amounts.
- Above 90 °F, 1 hour. On a hot afternoon, bring food out in small batches and back in quickly.
- Raw and cooked apart: a clean plate for cooked burgers, not the one that carried the raw patties.
Leftovers
Refrigerate leftovers within 2 hours of cooking or serving. Divide them into smaller portions in shallow covered containers so they cool fast — carve meat off the bone first. Use refrigerated leftovers within 3 to 4 days; frozen leftovers keep best for 2 to 6 months. Reheat to 165 °F, and add a little broth or water to keep meat moist.
Planning for safety, not just quantity
The calculators on this site add an allowance for seconds, but more food is not safer food. Plan to cook in batches, hold hot food in chafing dishes or roasters, and put out only what will be eaten while it is safe. For a buffet of 50, that might mean three rounds of each hot dish rather than one big pan — see how much food for 50 people.
Frequently asked questions
How long can food sit out at a buffet?
No more than 2 hours at room temperature, or 1 hour above 90 °F, according to USDA FSIS. Then discard it.
What temperature should hot food be kept at on a buffet?
140 °F or above. Cold food should be kept at 40 °F or below.
How long do party leftovers last in the fridge?
Three to four days, refrigerated within 2 hours of serving. Reheat to 165 °F.
Sources
- USDA FSIS — Let’s Talk Turkey: A Consumer Guide to Safely Roasting a Turkey (copy hosted by UW–Madison Extension) (opens in a new tab) — 1 lb of turkey per person (1¼ lb pre-stuffed); refrigerator thawing about 24 hours per 4–5 lb; cold water 30 minutes per lb; roasting timetable at 325 °F (163 °C); 165 °F (74 °C); 20-minute rest; 2-hour rule.
- FoodSafety.gov — Safe Minimum Internal Temperature Chart (reviewed Dec. 2022; copy hosted by the Virginia Department of Health) (opens in a new tab) — Poultry and stuffing 165 °F (74 °C); pork, beef and raw ham 145 °F (63 °C) with a 3-minute rest; ground meat 160 °F; leftovers 165 °F (74 °C).
- Utah State University Extension — Five tips for food safety at holiday buffets (opens in a new tab) — Hot food at 140 °F or warmer, cold at 40 °F or colder; 2 hours; several small platters; replace rather than add.
- NC Cooperative Extension — Keep those leftovers safe (opens in a new tab) — Bacteria multiply rapidly between 40 °F and 140 °F; refrigerate within two hours; use leftovers within three to four days.
- Reddy Ice — How much ice you need for a party (opens in a new tab) — 1 to 2 lb of ice per person.