These plants have been growing in a greenhouse. You need to gradually get them used to being outside.
They should not be planted until nighttime temperatures are at least 55 degrees. If you plant before then, cover them at night. Note- in cool weather tomatoes stop growing.
Tomatoes need a minimum of 6 to 8 hours of sun to grow well. Pick your spot accordingly.
Tomatoes love light and air. Planting them too close hinders both. Plant large plant varieties 3’ apart, very large types 4’, and dwarf varieties 18-24”.
Plant deep- bury the bottom 2 or 3” of stem when planting. Tomatoes are vines – roots will come out from the sides of the stems if they are buried, making very sturdy plants.