Sugar or snow peas are grown for their flat, green pods. Peas are a cool-season crop that must mature before the weather gets warm. The ideal growing temperature for peas is 55°F to 70°F. Sow peas in the garden 6 weeks before the average last frost date in spring or as soon as the soil can be worked.How to plant and spacing.lanting time. Peas are a cool-season crop that must mature before the weather gets warm. The ideal growing temperature for peas is 55°F to 70°F. Sow peas in the garden 6 weeks before the average last frost date in spring or as soon as the soil can be worked.