soil temperature for planting tomatoes
Setting out plants Set tomatoes in the garden when the weather has warmed and soil temperatures are above 60 degrees F. Temperatures below 50 degrees F impair tomato growth. In southern Missouri, plant tomatoes outside from April 20 to May 15.dd a complete garden fertilizer at the time the soil is prepared. For tomatoes, use a fertilizer low in nitrogen (N), high in phosphorous (P) and medium to high in potassium (K). Among the best analyses for tomatoes are 8-32-16 and 6-24-24.