You want the towel to be moist, not soaking wet. Too much moisture will increase the chance of the dill going bad faster.
If you’re using a freezer bag, use your hands to press out any excess air in the bag before you seal it.
Toss the dill out if you notice it’s darkening in color or if you see any signs of mold. [7] X Research source
Never let dill soak while you’re washing it. This can remove some of the herb’s fragrant flavor. [8] X Research source If you don’t have a salad spinner, you can simply rinse the dill under cool running water in the sink. However, this may not clean the dill as well as a salad spinner.
If you’re using a plastic bag, securing it around the jar with a rubber band helps stop oxygen from getting in and moisture from getting out. The best spot to keep your jar is in the door of the refrigerator. This is the warmest place so your dill won’t get too cold and dry out as fast. [12] X Research source
You want the dill to be dry enough that there is no moisture remaining (so it doesn’t freeze in a giant clump) but not dry to the point of being crunchy. [15] X Research source
When you’re ready to use your dill, just remove it from the freezer and drop it into whatever you’re cooking. It should defrost almost instantly if you’re using heat like on a stove or in the oven. If you’re using it in a dish that isn’t being cooked, let it sit somewhere room temperature to thaw out first. It shouldn’t take more than an hour. [19] X Research source