Answer: You can certainly move your plants outdoors when the weather is consistently warm and nighttime temperatures remain above 50F at night. Otherwise the colder temperatures of outdoors will slow or stop the growth and could stunt the plants. I don't know how warm/cold you've been keeping your greenhouse so I can't give you an absolute date for the move. As long as the temperatures outside are close to the temps your tomato plants have been receiving, there should be no stress to the plants when moved outdoors. Best wishes with your tomato plants.
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