Tomatoes grown from seed are often planted indoors long before the last area frost in order to give the plants the long growing season they need to produce quality fruit. You can plant tomato seeds that you have purchased or you can use heirloom seeds that you have saved or traded. Either way, planting tomato seeds is simple enough that even a novice gardener will not have any problems.
Fill the desired number of peat pots three-fourths full of sterilized potting soil. You will need one peat pot for each tomato plant you plan to grow.
Water the peat pots and soil until the soil is thoroughly wet.
Place three tomato seeds in each pot on top of the wet soil. Leave a small amount of space between the seeds in the pots.
Cover the seeds with approximately 1/4 inch of sterilized soil. Loosely cover the peat pots with plastic wrap and set the pots in a warm place.
Remove the plastic wrap when the seedlings break through the soil.
Thin the plants to one plant per peat pot after the plants have developed their two primary leaves. Choose the healthiest and strongest looking plant in each pot to keep.
Transplant the seedlings into six inch containers if the plants reach four to six inches tall and it is still too cold to plant in the garden.