Provide Consistent Warmth and Frost Protection
Tomatoes and peppers are both heat-loving, frost-sensitive tender perennials in their native ranges. Soil temperatures below 60°F stall root growth, and a late chill can kill young transplants. I always wait until night temperatures reliably exceed 55°F before setting my seedlings out.
For cooler climates, start seeds early indoors and use cloches, row covers, or even empty plastic bottles as mini-greenhouses around young plants. This little boost in warmth can translate to earlier flowering and bigger yields by midsummer!