Prawns: Storage, Freezing, Reheating and Pregnancy Answers

Written by Jordan Morley · Reviewed against NHS, FSA and USDA FoodKeeper guidance · Last updated 28 October 2026

This page pulls together the 9 prawns answers on the site: how long it keeps, whether you can freeze it, whether you can reheat it, how long it can be left out, what the date on the label means, where it stands in pregnancy and what applies while breastfeeding. The table gives the short answer for each; the page behind each row gives the full reasoning, the source and the exceptions.

In pregnancy: Hot, thoroughly cooked prawns are safe in pregnancy. The NHS says cold, pre-cooked ready-to-eat prawns must be cooked until steaming hot, and raw prawns are to be avoided.

Worth knowing: Reheating prawns is safe under the standard rules: it must have been cooled within 2 hours of cooking, kept refrigerated, and be reheated to 75°C (165°F) throughout, once only. Fish is delicate, so gentle methods — a covered dish in the oven, or short microwave bursts — get it safely hot without turning it to rubber.

Quick answers

Question	Short answer	Full answer
Can you eat it when pregnant?	🟡 Cooked — cold prawns need heating	Prawns when pregnant?
While breastfeeding?	🟢 Safe	Prawns when breastfeeding?
How long does it last?	🧊 Up to 2 days in the fridge	How long do cooked prawns last?
Can you freeze it?	🟢 Yes — freezes well (best quality for 1–3 months)	Can you freeze cooked prawns?
Can you reheat it?	🟡 Yes — once, gently	Can you reheat prawns?
Left out overnight?	🔴 No — throw it away	Prawns left out overnight?
Past the date on the label?	🔴 No — use-by means use by	Prawns after its use-by date?