While nighttime temps are still below 50°F, it’s a good idea to bring the plants indoors. During the day, as long as temps hover around 50°F or more in the greenhouse, the plants can live there. Note that you’ll still need to put them through some sort of hardening off process before putting the tomatoes outside permanently. This can be done in the greenhouse, to some extent, by exposing them to cooler temps during the day slowly over time.
While nighttime temps are still below 50°F, it’s a good idea to bring the plants indoors. During the day, as long as temps hover around 50°F or more in the greenhouse, the plants can live there. Note that you’ll still need to put them through some sort of hardening off process before putting the tomatoes outside permanently. This can be done in the greenhouse, to some extent, by exposing them to cooler temps during the day slowly over time.