A wedding cake can sit out overnight, but there are a few factors to consider to ensure its safety and quality. The buttercream itself can generally be kept at room temperature for up to 2 days in a cool spot, as long as it is covered with plastic wrap to protect it from drying out or absorbing any unwanted flavors from its surroundings. So, if you must leave the cake out overnight, it should be safe as long as it is stored in a cool and dry place and properly covered.
However, it is important to note that the specific ingredients and recipe used for the buttercream can also affect its shelf life outside the refrigerator. Some recipes may contain ingredients that are more prone to spoilage, such as dairy or eggs, which could potentially increase the risk of foodborne illnesses if left out for too long. Therefore, it is always a good idea to consult the specific recipe or consult with the baker or pastry chef to ensure the safety and quality of the cake.
If possible, it is recommended to keep the cake refrigerated until the day of the event or delivery. This will help to maintain its freshness and stability, especially if the cake has multiple tiers or delicate decorations. Refrigeration can also help to firm up the buttercream, making it easier to handle and transport without the risk of smudging or damaging the design.
Additionally, keeping the cake in the refrigerator can also provide an opportunity to make any last-minute adjustments or touch-ups before the big day. It allows for easier access to the cake and gives you more control over its appearance and overall presentation.
When delivering the cake, it is advisable to keep it in a cool environment, such as an air-conditioned car or a cooler with ice packs, to prevent the buttercream from melting or becoming too soft. It is also helpful to transport the cake in a sturdy, level surface to avoid any unnecessary movement or shifting during transportation.
While a wedding cake can sit out overnight if necessary, it is generally recommended to keep it refrigerated until the day of the event for optimal freshness and stability. However, if you must leave the cake out overnight, ensure it is stored in a cool spot, covered with plastic wrap, and consult the specific recipe or a professional for any additional guidance.