In short: Chocolate ganache made on butter keeps longest in the fridge — around three months — followed by buttercream at up to five days. Whipped and sour cream fillings keep least, 12–18 hours. Custard keeps two to three days, cream cheese around three days. Out of the fridge, any cream lasts 6–12 hours.
Why it matters
A well-made cream is already half the work of almost any dessert. But miscalculated quantities leave you with a surplus you would rather keep than throw away — and the shelf life of the finished dessert is decided by its most perishable component, which is almost always the cream.
Storage times by type
| Cream | Refrigerated | Room temperature | Freezing |
|---|---|---|---|
| Custard (crème pâtissière) | 2–3 days | 6 hours | no |
| Buttercream | up to 5 days | 6 hours | 2 months |
| Meringue-based (protein) cream | 3 days at +2…+6 °C | 12 hours | — |
| Whipped cream and sour cream | 12–18 hours | 6 hours | not advised |
| Yoghurt cream | up to 1.5 days | 5–6 hours | — |
| Curd cheese cream | 18 hours | — | — |
| Chocolate ganache on butter | about 3 months | up to 12 hours | yes |
| Cream cheese frosting | about 3 days, sealed | 12 hours | no |
How to freeze cream properly
Only ganache and buttercream take freezing well. Put the leftovers into an airtight container, keep them away from strongly scented foods, and thaw in the fridge without stirring.
Storing finished desserts
Remember the rule: the shelf life of a dessert is set by its most perishable component. In practice that component is the cream, so check its limit rather than the cake as a whole.
Frequently asked questions
Can pastry cream be frozen
Buttercream takes freezing well; custard and cream cheese frosting do not — they split and weep on thawing.
How long does a filled cake keep
By its most perishable part. With custard that is two to three days refrigerated; with whipped or sour cream fillings, 12–18 hours.
How do I know the cream has gone off
By a sour smell, a change of colour and separated liquid. Do not taste it to check.