Select a planting site that receives full sun and has well-drained soil. Loosen the soil with a garden spade and dig in 1 or 2 inches of organic matter, such as compost or well-rotted manure.
Soak the pea seeds in room-temperature water for at least six hours before planting. Drain the seeds and dust them lightly with a commercial inoculant developed for legumes.
Set up a support system for the plants to climb, as sugar snap pea vines grow 4 to 6 feet long. Create a simple trellis with string, netting, or chicken wire stretched between posts pushed into the ground every 4 to 6 feet.
Plant the seeds in a single row at the base of a trellis as soon as the soil can be worked in the spring. Space seeds 6 or 7 inches apart. Cover the seeds with 1 inch of soil and press firmly to settle them in the soil.
Water the soil immediately after planting. During dry periods, soak the soil with at least 1 inch of water weekly.
Pull weeds frequently, especially when the pea plants are small. Mulching single-row plants with straw can keep weed growth to a minimum.
Harvest sugar snap peas when they are filled with peas but still tender and juicy. Chill them in a refrigerator within six hours of harvest to keep the sugars from turning to starch.
Save some of your snap pea crop for next year's planting. Most peas are open pollinated, so they will grow true from seeds. At the end of the harvest, pull several plants and hang them upside down in a dry spot to allow the seeds to dry thoroughly. Store the seeds in an airtight container.