Soup Left Out Overnight: Is It Safe?
Written by Jordan Morley · Reviewed against FSA chilling & danger-zone guidance · Last updated 28 October 2026
No — soup 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, soup 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 soup 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 soup alongside its safety information.
How long can soup be out? Limits compared
| Source | Limit | Detail |
|---|---|---|
| Food Standards Agency (Clostridium perfringens page, 2026) | Cool and chill within 2 hours; not more than 4 hours out (less on a very warm day) | Spores 'can survive cooking and grow during slow cooling and unrefrigerated storage'; applies to batch cooking at home |
| USDA FSIS, 31 Jul 2020 | 2 hours; 1 hour above 90°F (32°C) | Divide a big pot of soup into smaller, shallow containers to cool it |
| The Daily Meal, 7 Jan 2024 (US) | 'The short answer is: No!' for soup left overnight | Danger zone 40 to 140°F, more than two hours |
| Love Food Hate Waste NZ, Feb 2026 | Refrigerate within 2 hours; over 4 hours safer to discard | General leftovers |
Overnight is 8 hours or more: past every limit above.
Why a big pot of soup is the problem
A pot of soup is hot right to the middle, so it cools slowly and spends a long time in the temperature range where bacteria multiply. The Food Standards Agency's Clostridium perfringens page says to cool leftovers within 2 hours and to divide food into smaller portions so it cools faster, and that the risk 'also applies to batch cooking at home'. A Bromley council leaflet for caterers says bacteria can multiply in 'the bottom of a large pot of casserole or stew'. Neither source names soup, so this is the nearest sourced reasoning, not a soup-specific rule. Letting the pot cool on the hob and putting it away in the morning is exactly the situation the advice is written for.
Can boiling it again save it?
The Daily Meal says you would have to 'boil the soup vigorously for 10 minutes' to be completely safe and that even then boiling will inactivate, but not destroy, botulinum spores. That article cites no source for the 10 minutes, so we do not adopt it. The Food Standards Agency's research page says reheating to steaming hot throughout is for killing bacteria that grew in properly stored leftovers; none of the UK sources we read says reheating makes soup that sat out overnight safe, which is why our advice is to bin it.
If you did get it in the fridge in time
| Source | Fridge life for soup or cooked leftovers |
|---|---|
| Food Standards Agency | Eat within 48 hours or freeze it |
| Which?, 17 Dec 2025 | 2 to 3 days |
| safefood (Ireland) | 3 days for a cooked dish (lasagne example) |
| Tasting Table, 25 Feb 2024 (US, citing USDA) | 3 to 4 days for homemade soup |
We use the Food Standards Agency's 48 hours. See how long leftover soup lasts in the fridge and freezing leftover soup.
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; smaller portions; spores survive cooking; batch cooking at home
- USDA FSIS: Leftovers and food safety (last updated 31 July 2020) — 2 hours; 1 hour above 90F; divide a big pot of soup
- The Daily Meal: You accidentally left your soup out overnight (Tom Maxwell, 7 January 2024; US) — No for overnight; boil 10 minutes claim (not adopted)
- London Borough of Bromley: Clostridium perfringens leaflet for food businesses (no date shown) — bacteria multiply at the bottom of a large pot
- Love Food Hate Waste NZ: How long is it safe to keep your leftovers? (published 30 October 2016, modified 20 February 2026) — 2 hours; over 4 hours safer to discard
- Food Standards Agency research report: Not reheating leftovers until steaming hot throughout (published 31 October 2023; not consumer guidance) — reheat steaming hot to kill bacteria that have grown
- Food Standards Agency: How to chill, freeze and defrost food safely (page text 'Published 18 December 2017'; page metadata shows 2026 updates) — eat leftovers within 48 hours or freeze
- Which?: Revealed, the best ways to reheat your takeaways (17 December 2025, Tom Morgan) — refrigerated leftovers within 2-3 days
- safefood (Ireland): Freeze raw meat (no date shown) — cooked dish eaten within 3 days
- Tasting Table: How long you can store homemade soup in the fridge and freezer (Austin Havens-Bowen, 25 February 2024; cites USDA) — 3-4 days (USDA-cited)
- NHS: Food poisoning (page last reviewed 19 December 2024) — symptoms, timing, home treatment, when to call 111 or 999
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Cool it faster next time
Soup: the other answers on this site
| Question | Short answer (links to the full page) |
|---|---|
| Reheating | Yes — boil it through |
Common questions
Can I reheat soup 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 do soups, stews and curries need extra care?
Big pots cool slowly in the middle, which keeps the centre in the danger zone for hours. Clostridium perfringens, which loves large batches of meat dishes and gravy, thrives in exactly that. Portion into shallow containers so it cools quickly.
How should I cool leftovers so this doesn't happen?
Divide into shallow containers, let the steam escape, and get it into the fridge within 1–2 hours of cooking (rice within 1 hour). Keep the fridge at 5°C or below. Freeze anything you will not eat within 2 days.
How long does soup last if it IS stored properly?
In the fridge at 0–5°C, soup 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 soup left on the hob overnight safe if I boil it before eating?
None of the UK sources we read says so. The Food Standards Agency's guidance is to cool leftovers within 2 hours and chill or freeze them. We would not rely on boiling soup that sat out overnight.
How should I cool a big pot of soup quickly?
The Food Standards Agency says to divide food into smaller portions so it cools faster and to get it into the fridge or freezer within 2 hours. USDA FSIS gives the same shallow-container example for a large pot of soup.
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.