The short answer is that biscuits usually keep for a long time, when they're completely cooled and stored in a container with a tight lid in a cool, dark place. Keep crisp and soft biscuits separate, and use your senses, as there's no fixed number of days they'll last.
Dims Studio's own figures: Among the glass storage jars sold, 68% had yellow, 41% had pink and 30% had green as one of the colours, and half cost under DKK 105 (more than 100 items sold, November 2025 to October 2026).
Contents
Once the Christmas biscuits are baked and cooled, the question soon arises: how long do they actually keep, and how do you avoid the crisp biscuits turning soft, or the fatty biscuits developing an unpleasant taste? There's no simple answer with a fixed number of days for homemade biscuits, but there are some simple principles that determine how well they keep.
In this guide, you'll find out why biscuits go soft or rancid, and get a guide to storing them properly, whether it's crisp ginger biscuits, soft treacle biscuits or Christmas sweets.
How long do biscuits keep?
Biscuits only need a short baking time, and they usually have a long shelf life when stored properly. How long an individual biscuit keeps depends on the type, whether it's crisp or soft, how much fat and sugar it contains, and how it's stored afterwards.
There's no fixed rule with a number of days or weeks for homemade biscuits. Instead, it's about creating the right conditions: the biscuits should be completely cold, kept in a container with a tight lid, and preferably in a place that's cool and dark. Crisp and soft biscuits should never be stored together, as they affect each other.
Why do my crisp biscuits go soft?
Moisture always moves from the damp towards the dry. If, for example, raisins are packed together with dry cornflakes, the water moves from the raisins into the flakes, so the raisins become hard and the flakes become soft. The same principle applies to biscuits: if a crisp biscuit is placed close to something with more moisture, such as a soft biscuit or a piece of fruit, it draws the moisture to itself.
Even without that kind of neighbour, hard biscuits age over time and go soft on their own. That's why it's important to seal the biscuits tightly, so they don't absorb moisture from the air around them.
Why can biscuits turn rancid?
Fat and oil in biscuits can turn rancid when exposed to air, light and moisture. It's a form of oxidation, and it creates an unpleasant smell and taste that ruins the experience, even though the biscuit still looks fine. Heat and light speed up this reaction, so the warmer and brighter the biscuits are kept, the faster they can turn rancid.
That's why it's a good idea to store especially fatty biscuits somewhere cool and dark, with as little air around them as possible. A container with a tight lid retains the cold and keeps light and air out.
How to store your biscuits step by step
- Let the biscuits cool completely before packing them away. Warm biscuits create condensation in a sealed container, and that moisture can make crisp biscuits go soft straight away.
- Sort the biscuits so each kind goes in its own container. Never mix crisp and soft biscuits in the same container, as moisture travels between them.
- Seal the lid tightly around the biscuits, so air and moisture from outside are kept out.
- Place the containers somewhere cool and dark, away from the cooker, oven and window.
A glass storage jar makes it easy to see which kind of biscuit is in which container, without you having to keep opening the lid. You could, for example, use a Striped glass storage jar, purple and yellow from EJA for the crisp pepper biscuits and a Storage jar in light green and pink from EJA for the soft brown spiced biscuits, so they never get mixed up.
Tip: Feel free to write a note on the container with the day the biscuits were baked, so you can easily keep track of how long they've been kept.
Find more glass storage jars that make it easy to keep track of your Christmas baking.
See glass jarsDifferent types of biscuits need different storage
Dry, sugar-rich spiced biscuits like pepper biscuits keep well for a long time. This is because the spices used to help extend the biscuits' shelf life, and because pepper nuts were originally baked without raising agent, making them very hard and dry. Dry biscuits with lots of sugar and only a little fat, milk and water, as you also see with honey biscuits, keep for longer than moist, fatty biscuits for the same reason.
Fatty biscuits, such as those with lots of butter, are more prone to turning rancid, because the fat reacts with air over time. So bake them until they're golden, not brown. If the biscuits get too brown, it's a sign that the substance acrylamide has formed, which is another reason to keep an eye on the baking time.
Christmas sweets should be kept covered in a box with a lid and stored somewhere cool, ideally in the fridge depending on what the sweets contain. If you want to know more about how sweets have traditionally been stored in Denmark, you can read the article about bonbonnières.
Different kinds of Christmas baking need different care to be stored properly.
| Type of biscuit | Property | Storage |
|---|---|---|
| Dry spiced biscuits (e.g. pepper biscuits, honey biscuits) | Keeps for a long time due to lots of sugar and little fat | Container with a tight lid, cool and dark |
| Fatty biscuits (e.g. butter biscuits) | Risk of turning rancid, because the fat reacts with air | Baked until golden, not brown, stored cool and dark with a little air |
| Christmas sweets | Sensitive to heat and light | Covered box with a lid, ideally in the fridge depending on content |
Can you freeze biscuits?
Yes, baking can easily be done well in advance and frozen, so you've got your Christmas baking sorted before the Christmas table needs to be set. Wrap the biscuits well, as baked goods risk drying out in the freezer if they're not sealed tightly. Take the biscuits out in good time so they can thaw and reach room temperature before serving.
How long do they actually keep, and how do you know?
Homemade biscuits don't have a date label, so you can't look one up. Instead, you can use the Danish Veterinary and Food Administration's method to judge whether the biscuits are still good: look, smell and taste.
- Look for mould. Even a small mouldy spot can mean the mould has spread far into the biscuit, just like with a pepper, where it's not enough to cut away the mouldy area.
- Smell the biscuit. If it smells sour or rancid and unappetising, don't eat it.
- Taste a small bite if the biscuit looks and smells fine. If it tastes bad, throw it out.
Frequently asked questions
How long do biscuits keep?
There's no fixed number of days, but biscuits usually keep for a long time if they're completely cooled and stored in a container with a tight lid somewhere cool and dark. Use your senses to judge them along the way.
How do you store biscuits so they stay crisp?
Let the biscuits cool completely, sort crisp and soft biscuits separately, and store them in a container with a tight lid in a cool, dark place.
Why do my biscuits go soft?
Moisture travels from damp things to dry ones, and if you shut a crisp biscuit away with something moist, it will draw in the moisture. Hard biscuits also go soft over time on their own.
Can you freeze biscuits?
Yes, baked goods can be made well in advance and frozen, but wrap the biscuits well so they don't dry out in the freezer.
Should biscuits be stored in the fridge?
It depends on the biscuit. Christmas sweets can benefit from being kept cool, ideally in the fridge depending on the ingredients, while most dry biscuits do fine in a sealed container in a cool place outside the fridge.
How can you tell if biscuits are too old?
Use the Danish Veterinary and Food Administration's method: look for mould, smell for a sour or rancid odour, and taste a small bite if the biscuit looks and smells fine. If it tastes bad, throw it out.
Summary
Biscuits keep best when they're completely cooled, stored in a container with a tight lid, and kept cool and dark with crisp and soft biscuits separated. There's no fixed number of days for how long they last, so use your eyes, nose and taste buds to judge the biscuits as you go, and feel free to pop any leftover baked goods in the freezer if you want to bake well in advance.
Read also
- What is a bonbonnière? A classic Danish sweet container through the ages
- Christmas table setting: how to set your Christmas table
- How do you make a kitchen cosy?
- Hostess gift: The perfect thank-you gift
- Mulled wine: how to make it, and what goes with it
- Hot cocoa: make it with cocoa powder or chocolate
- Christmas lunch menu: the classic menu and good planning
Find more things for the Christmas table and storage
Dinna has hand-picked biscuit tins, jars and cake plates, so your Christmas baking can be stored and served beautifully.
See biscuit tins