Harvest or gather your dill. You are only going to be using the fern-like fronds to create the dill weed.
Wash and dry the dill fronds if desired. Separate the fronds from the main stem and remove any flower heads so you are just left with the individual fronds.
Place the fronds on the mesh racks in your dehydrator. Set the dehydrator to 95ª Fahrenheit for three to four hours. The dill will be fully dried when you can easily crumble it in your hands, and it breaks down into tiny pieces. If it feels flexible as opposed to brittle, allow it to dehydrate for another 30 minutes and check again.
Once fully dried, remove the dill and crumble it using your hands. Separate out any large pieces. Store the dried dill weed in an air-tight container. Use a glass jar and a vacuum sealer if you have one. Keep the jar in a cool, dark location. Use the dill weed within 12 months for the best flavor and freshness.
Notes
Alternative Oven Method: Preheat the oven to as low as it can go (around 170º to 220º Fahrenheit if possible). Line a baking sheet with parchment paper, then add your dill fronds on top. Bake the dill for one to two hours. Check the dill every 30 minutes after the first hour. If the dill is dry, remove the baking sheet. Allow the dill to cool, then crush it and store it. If it isn't dry, allow the dill to "bake" for 30 more minutes and check again.