The answer to 'when to sod' is that the best time to lay sod is during the active growing season for your specific grass type, typically in the spring or fall. Sod can be installed year-round in many climates, but spring and fall offer the ideal conditions for the sod to quickly establish roots and thrive.
Laying sod in the spring allows the grass to take root and grow during the warmer months, while fall sodding gives the grass time to establish itself before the stressful summer heat and winter cold. Avoid installing sod during the hottest or coldest times of the year, as the grass will struggle to take hold and may die off. With proper preparation and care, sod can provide an instant, mature lawn that will last for many years.