Cooked Chicken Left Out Overnight: Is It Safe?
Written by Jordan Morley · Reviewed against FSA chilling & danger-zone guidance · Last updated 28 October 2026
No — cooked chicken left out overnight should be thrown away. Perishable food shouldn't sit at room temperature for more than 2 hours.
Why overnight is too long
In the fridge, cooked chicken keeps up to 2 days (FSA and NHS advice) — on the counter, the limit is 2 hours. Food kept between about 8°C and 63°C is in the range where bacteria can multiply; overnight is 6–8+ hours in it. Cooling quickly and keeping food cold is what the UK agencies stress, not reheating food that sat out, so reheating cooked chicken in the morning is not a reliable fix. It may look and smell completely normal; bin it anyway.
You can also check the calorie content of cooked chicken alongside its safety information.
How long can cooked chicken be out? The time limits compared
| Source | Limit | Detail |
|---|---|---|
| Food Standards Agency (Clostridium perfringens page, 2026) | Cool and chill leftovers within 2 hours; do not leave food out more than 4 hours ('less on a very warm day') | The 4 hours is an outer limit for food left out, not a target |
| Love Food Hate Waste NZ (modified Feb 2026) | Refrigerate or freeze within 2 hours; over 4 hours at room temperature 'you are safer not to eat it' | Same two numbers as the FSA |
| USDA FSIS (31 Jul 2020) and Chowhound (24 Mar 2025) | Discard after 2 hours; 1 hour if over 90°F (32°C) | US rule; Chowhound attributes it to the FDA |
| Bromley council leaflet (for food businesses) | Cool for no longer than 90 minutes before chilling; keep hot food above 63°C | Business guidance, shown for comparison |
Overnight is 8 hours or more, beyond every limit above. The 2-hour and 4-hour numbers are not a contradiction: 2 hours is when to get it into the fridge, 4 hours is the point past which no source says to keep it. Our page uses 2 hours as the working rule.
Which situation was it?
| Situation | What to do |
|---|---|
| Roast chicken carved and left to cool on the counter | Fridge within 2 hours (Food Standards Agency). Dividing into smaller portions helps it cool faster |
| On the table or a buffet | Under 2 hours: fridge it. Past 4 hours: bin it. On a hot day or in the sun, less (FSA gives no number; USDA says 1 hour above 90°F) |
| Slow cooker on the warm setting | Chowhound suggests no more than 4 hours on warm; the council leaflet says to keep hot food above 63°C |
| Takeaway chicken that sat in the bag | Count the time from when it was cooked, not from when you picked it up |
| Overnight, covered or in a closed oven | Bin it. A lid or foil does not stop bacteria growing |
The last two rows are our reading of the time rules above, not separate quotes from a source.
Will reheating make it safe?
The Food Standards Agency's own research page says leftovers should be reheated until steaming hot throughout to kill bacteria that may have grown since cooking, but that is advice for food that was cooled and stored properly. For chicken that sat out too long, Chowhound says that putting it in the fridge or reheating it 'will not kill all of the newly-grown bacteria', so it should still be thrown away. We found no UK source that says reheated overnight chicken is safe, and the UK agencies concentrate on cooling and cold storage instead. Properly stored cooked chicken keeps for up to 2 days in the fridge; see how long cooked chicken lasts in the fridge.
If someone already ate it
The NHS lists the symptoms of food poisoning as feeling or being sick, diarrhoea, tummy pain, a high temperature and feeling generally unwell. They 'usually start within a few hours or a few days' of eating the food (sometimes not for a few weeks) and 'usually get better within a week'. Most people can be treated at home with lots of fluids. The NHS says to call 111 if you are worried about a baby under 12 months, cannot keep fluids down, have had diarrhoea for more than 7 days or vomiting for more than 2 days, and to go to A&E or call 999 if you vomit blood. The NHS page does not mention pregnancy; if you are pregnant and unwell, our suggestion is to contact your midwife or 111 rather than wait.
Sources checked
Everything in the sections above was checked against these pages on 28 October 2026.
- Food Standards Agency: Clostridium perfringens (consumer guidance on GOV.UK; published 25 June 2026, page metadata updated 20 July 2026) — cool within 2 hours; not left out more than 4 hours, less on a very warm day
- Love Food Hate Waste NZ: How long is it safe to keep your leftovers? (published 30 October 2016, modified 20 February 2026) — 2 hours to refrigerate; over 4 hours safer not to eat it
- USDA FSIS: Leftovers and food safety (last updated 31 July 2020) — 2 hours; 1 hour above 90F; 3-4 days; 165F
- Chowhound: Here's how long you can safely leave cooked chicken out (Greta Pano, 24 March 2025; US) — FDA-attributed 2 hours; 1 hour above 90F; reheating does not kill all newly-grown bacteria; slow cooker 4 hours
- London Borough of Bromley: Clostridium perfringens leaflet for food businesses (no date shown) — 90 minutes cooling; keep hot above 63C
- Food Standards Agency research report: Not reheating leftovers until steaming hot throughout (published 31 October 2023; not consumer guidance) — reheat until steaming hot; bacteria grow between 8C and 63C
- NHS: Food poisoning (page last reviewed 19 December 2024) — symptoms, timing, home treatment, when to call 111 or 999
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Cooked Chicken: the other answers on this site
| Question | Short answer (links to the full page) |
|---|---|
| In the fridge | Up to 2 days in the fridge |
| In the freezer | Yes — freezes well (best quality for 4 months) |
Common questions
Can I reheat cooked chicken that was left out overnight to make it safe?
No. Reheating cannot be relied on to make food that sat out overnight safe, because bacteria that multiplied overnight may have left toxins behind that heat does not reliably remove (Healthline makes this point for Bacillus cereus in rice). Our advice is to bin it.
It looks and smells fine — is it really unsafe?
Unfortunately the bacteria that cause food poisoning don't usually change how food looks, smells or tastes. 'It seems fine' is not a safety test.
What if it was only out for a few hours?
The widely used cautious rule is a maximum of 2 hours at room temperature (1 hour above about 32°C), and NHS and FSA advice is to cool and chill leftovers within 1–2 hours. Past that, bacteria may have multiplied to risky numbers and some make toxins that cooking will not destroy, so 'only 3 hours' is not a safe bet.
Why is meat and poultry riskier than other leftovers?
The Food Standards Agency says Clostridium perfringens spores 'can survive cooking and grow during slow cooling and unrefrigerated storage', and a council leaflet for caterers names meat, meat products such as stews, and gravy as the main foods involved. We found no source that ranks cooked meat against other leftovers, but the cooling and storage rules matter most for meat dishes. Reheating is not a reliable fix for meat that has sat out overnight.
How long does cooked chicken last if it IS stored properly?
In the fridge at 0–5°C, cooked chicken lasts Up to 2 days (FSA and NHS advice) — as long as it goes in within 2 hours of cooking or serving. NHS and FSA advice for cooked leftovers is to eat them within 2 days. On the counter the limit is 2 hours; that gap is the whole point of the rule.
Is it 2 hours or 4 hours for cooked chicken?
The Food Standards Agency gives both: cool leftovers within 2 hours and put them in the fridge or freezer, and do not leave food out for more than 4 hours (less on a very warm day). We treat 2 hours as the rule and 4 hours as the absolute outer limit.
Can I keep chicken warm in the oven overnight?
No source we read supports it. The Bromley council leaflet says to keep hot food above 63°C, but that is guidance for businesses serving food, and an oven that is switched off is not holding that temperature.
Related answers
Primary source: FSA chilling & danger-zone guidance.
General information only, not medical advice: see the medical disclaimer. Feeling unwell after eating something? Contact NHS 111 or your GP.