Cabbage seed germinates best when exposed to a constant temperature of 65 to 70 degrees Fahrenheit. At this temperature range, seeds will sprout within three to four days. The seed will germinate in a temperature range of 45 to 85 degrees Fahrenheit. Allow the seeds to germinate. Place the container in a warm location and keep the soil moist by spraying it with warm water as needed. Cabbage seeds require a temperature of 70 degrees F to germinate. Expect the seeds to germinate between five to 10 days.