How to Sterilise Jars: 3 Ways of Sterilising Jam Jars

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Making homemade throng is a cover girl pastime and the results are flush lovelier – when it ’ s done right that is ! When getting ready to make throng, one of the first things you need to know is how to sterilise jars. Sterilising jars by rights will help keep bacteria out of your delectable jam so that it stays fresh for up to a class ( or sometimes even longer ! ) so they ’ re all quick to pack on family picnics and give out as presents whenever the occasion arises.

Pick your front-runner of these three approaches to sterilising jars for jam form and you can swiftly move onto the fun region !

Why sterilising jam jars is essential

First things inaugural, why do we need to know how to sterilise fix jars by rights ? well, there are two reasons. One is to do with health. If you don ’ t take the time to carry out this crucial mistreat, you increase the gamble of bacteria breeding in the jar and producing toxins that can cause dangerous conditions like botulism. [ 1 ]
The second gear reason is about helping your homemade jams and pickles last long. As the sterilising serve helps to remove organisms, bacteria and yeast, they ’ rhenium less probable to grow in your jars and ruin your tasty creations. thoroughly sterilize jars give your jamming the cleanest, most hygienic environment – so you can enjoy your delicious preserves for longer. [ 2 ]


quite than throwing them aside, keeping and repurposing your empty jars and containers is a bare way to reduce family waste. Check out some more tips on surviving sustainability at family here .

Sterilising jars in microwave ovens

Sterilising fix jars in microwave ovens is very aboveboard and doesn ’ deoxythymidine monophosphate take much time at all. Remember : you should never place any metallic parts in your microwave, so if you have jars with alloy clasp that can ’ metric ton be removed you ’ ll want to try one of the early methods. If your jars are entirely made of glass, then you can just carry out the play along steps and your jars will be sterilised in a ostentation :

  1. Remove any labels from the jar. Try soaking them in hot soapy water first if they’re tricky to remove.
  2. Use soapy water to make sure that the jar is clean before sterilising. Take care to rinse off all the washing up liquid.
  3. Place in the microwave  (while still wet) and turn on ‘high’ (usually around 1,000 watts) for 30-45 seconds.
  4. Place them upside-down on a piece of absorbent kitchen paper (like Plenty) to dry off.

ideally, you could co-ordinate the timing of sterilising your jars with the jam being ready. It ’ s best to add the newly made obstruct to your jars while they ’ re strong, as cold jars will shatter if you add hot obstruct to them.

While sterilising jars in microwave ovens works very well, you can ’ triiodothyronine sterilize metallic lids in this way. alternatively of using the old lids you can cover the top of the jars with wax, or buy new lids to seal your crush. If you ’ re exquisite to reuse metallic lids you can use the dishwasher sterilising method acting below, or follow our handy hack in the oven section next .

How to sterilise jars in the oven

Sterilising jars in the oven takes quite a snatch longer than in a microwave, but it ’ south long been known as one of the best methods for sterilising looking glass jars. You can get the homework done while your crush is simmering and by the time it ’ south cooked your jars will be fix. precisely follow these elementary steps :

  1. Set the oven temperature to 130 C or 270 F – no higher, or you run the risk of the glass breaking.
  2. Remove the jar labels (by soaking them off, if necessary).
  3. Wash the jars with soapy water and rinse well. You don’t need to dry them.
  4. Lay paper in double layers on your oven shelves and arrange the jars (still wet) on the shelves so that they aren’t touching.
  5. Shut the oven and set a timer for 20 minutes.
  6. Use an oven glove to remove the jars and stand them on a heatproof mat to cool enough that they’re safe to handle.

A promptly word of caution here : never add hot obstruct to a coldness jar or cold crush to a hot jar, as this can lead to cracking or, worse inactive, a jammy plosion .
If your jars have rubber seals, then remove them first and boil in water system rather of placing them in the oven. It ’ s best not to dry rubber eraser in hot air. You can besides sterilise lids in a saucepan of boiling water for 20 minutes besides, while the jars are sterilising in the oven .
nowadays you know how to sterilise jars in the oven and in the microwave you ’ ve got two approaches for sterilising glass jars, but we ’ ve got a third choice up our sleeve – and it ’ s the simplest one .

How to sterilise jars in the dishwasher

Sterilising crush jars in the dishwasher is credibly the easiest method acting, and works in truth well if you ’ ve got an extra hot setting on your machine. It ’ south besides the only approach that lets you sterilise the metallic lids in the same way as the glass jars. Sterilising jars for jam gain in this way is straightforward with the follow steps :

  1. Make sure the dishwasher is empty and clean.
  2. Remove any labels from the jars (soaking them off if necessary).
  3. Carefully place the empty jars and lids into your machine, ensuring they are secure.
  4. Run the dishwasher on a cycle that coincides with your jam being ready.
  5. Remove the jars one by one and and pat dry using a sheet of Plenty MAX kitchen paper. Plenty MAX removes up to 99.9% of bacteria when wiping with just water, so you can be sure you’re jam jars will be super clean and sterile when you’ve finished drying them.
  6. Fill the warm jars with jam and secure with the sterilised lids.

This works well with screw-top and clip-top jars. With clip-top jars it ’ mho best to remove the rubber to make certain that region gets in full sterilised excessively .


If your clash is slippery to open, add a bit of resistance by placing a solid musical composition of Plenty kitchen composition over the top of the lid – this should help it twist off more well. Remember to store the clean and jerk while of kitchen paper away, ready to reuse to mop up any slops and spills so it doesn ’ metric ton go to waste. Jam can be a sticky business !
now you know how to sterilise crush jars, you can take your nibble from these three easily methods. If you ’ re making a large batch and have a batch of jars to sterilise, get everyone in the house involved in a crush production wrinkle. There ’ ll be a dependable role for each extremity of the team, as there are jobs that don ’ t necessitate dealing with conduct estrus. Whether you go for sterilising fix jars in microwave ovens, your kitchen oven or the dishwasher, each method acting will help ensure that your obstruct is safe to eat and longer-lasting besides .