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Onions are best started indoors, 8 to 12 weeks prior to the last frost.Sow your onion seeds directly to the surface of the soil. Cover with a quarter inch of topsoil.Onions are a cool weather crop, so they thrive in the early months of Spring and the late months of Fall. Ideal temperatures should stay beneath 70F, but above 55F. You will also want to provide an area of full sunlight for the majority of the day. The soil should be friable, fertile, as well as loose and free of all rocks or gravel. You will also want to make sure that your sowing medium is well drained as well.Water the seeds daily so that the soil remains moist, but avoid drowning or overwatering.Onions typically begin germinating in about 7 to 14 days after sowing. The green tops will grow to roughly 20 to 24 inches tall, producing 8 to 12 ounce bulbs. Onions can be spaced roughly 3 to 4 inches apart from one another, in rows spaced 12 to 18 inches apart.