Answer: Tomatoes are warm-season crops that do best in warm soils and summer weather. The last average frost in the Seattle area is about mid-April. Add 2-3 weeks for the soil to warm up, and you can safely plant tomato starts the second week of May. If you plant them too early, they'll just sit and sulk. I've always had good success when I get transplants of tomatoes, peppers, squash and melons in the ground on the first of June in my Seattle area garden.
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