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Dry out the bulbs for three weeks. Prepare the dahlias for storage. Find a place to store your bulbs inside. Check the bulbs throughout the winter.
You should not store the bulbs until they're completely dry. This process takes about three weeks. After you've removed the bulbs from the soil, place them upside down in a pot.  Place the pot in an area away from direct sunlight during the drying process.  The pot should be placed in a dry, airy space. A storage shed or garage would work well. After three weeks have passed, you can prepare your dahlias for winter storage. They should be packed into storage containers with either peat moss, sawdust, or potting mix.  Use a tray to store your plants. Then, cover the container with a piece of burlap or a similar material. If your area is not prone to extremely cold winters, you can leave the tray outside near your garden. However, if temperatures drop below 16°F (−9°C), you need to store the dahlia bulbs in some kind of shelter. The area must be dry, cooler, and well-ventilated for the bulbs to thrive.  A dry cellar or cupboard in a cooler area of your home, such as a basement or attic, are all good areas to store dahlia bulbs. For best results, the storage area should have a temperature between 39° to 45°F (4° to 7°C). You don't want to neglect your bulbs until the coming spring. Throughout the winter, check on them regularly. If you notice any signs of decay. If you notice the bulbs are shriveling, mist them with water. If any portion starts to rot, trim that portion off and remove it from the container.