Will it ever warm up? It is still too cool to plant tomatoes and other warm weather crops outdoors, tomatoes need night time temperatures that are consistently over 50° and soil temperatures over 60° Peppers would like it even warmer!
Until it warms up I recommend moving tomatoes from 4" pots into a gallon sized pots, then to a 2 gallon pot. Setting them in the sun each day (or sheltering them from rain and hail) and moving them inside at night. Once the weather has warmed, dig a deep hole, remove the lower branches and leaves and plant the tomato deeply, allowing the stem/trunk to sprout roots. The video below was taken 4 years ago, since then I've perfected my tomato growing method, now I train them onto a trellis instead of staking them; however you choose to grow them. be sure to use a very sturdy support.
Each plant is pruned to 2 to 3 main stems that are tied to the cattle panel trellis.