Growing vegetables in Seattle is very easy. Unlike some places, Seattle gets plenty of rain—you may not need to water your vegetable garden until summer. Even then, summers may provide enough natural precipitation and watering your garden may not be necessary. However, a bit of water in the morning won't hurt your vegetable garden. Although you can often grow vegetables from seed, starting seeds indoors four to six weeks before the last expected frost can help give your garden a head start.
Place a garden stake at each corner of your planned garden beds.
Use a string wrapped around the stakes to delineate your garden.
Rototill the area inside the string. If rototilling, you don't need to remove the grass. The grass will end up chopped up under your garden and can act as a good source of garden nutrients.
Add a couple of inches of compost to the newly prepared garden.
Break up larger clumps with a shovel or hoe as you mix the top layer of soil with the compost.
Rake the surface of the gardens until they are smooth.
Plant your young seedlings once the risk of frost has passed. In most cases, you should be safe by mid-April. Follow seedling spacing instructions printed on the seedling spike from the nursery or on the seed packet.
Water your new planting with 3 or 4 inches of water if rain is not forecast.