So, Daisyjane69...my tomato that I planned on putting in a pot in the greenhouse won’t do anything? I can still find a place outside. We in the NW always have a struggle to get tomatoes to ripen...plus I have a little altitude and Douglas fir shade to deal with.
If your greenhouse gets warm enough, by all means put your little tomato in there! My friends in the NW often mention the same problem as you have. The more sun and heat the better. Just remember to keep it around 86 or so degrees. If the plant is isolated, without any pollinators, you may need to take a Q-tip and kinda pollinate them by hand. Or bring a companion tomato plant in there and leave the door open part of the day so your winged friends can get in and do their thing. Don’t water them every day. Water them when they start to wilt. Tomatoes benefit from a bit of water stress. Low nitrogen (or you’ll get all vine) and high phosphorous fertilizer.
Hope that helps!