Early spring is the time to stabilize sites which expect to be complete and occupied by this summer, prior to the fall growing season (mid Sept through October).
The following information is quoted directly from Rutgers Fact Sheet FS 584: Seeding Your Lawn
Rapid Lawn Establishment: At certain times, such as in new home construction where dust or muddy conditions cause concern or on sloping terrain where soil erosion is a serious problem, a rapid cover of turfgrass is most critical. A first choice may be sodding the critical areas (see Rutgers Cooperative Extension fact sheet FS104, “Steps to an Instant Lawn”). Another choice can be the use of seed mixtures containing primarily perennial ryegrass or tall fescue. These varieties in combination with the use of straw mulch (see next point) and timely rainfall or irrigation can provide an “established” lawn in 4 weeks if growing conditions are favorable.
Clean straw mulch conserves moisture.
Straw Mulching and Irrigation: It is desirable to keep newly seeded lawns moist in the top 2 inches through irrigation or rainfall. If the top layer of soil dries out prior to good root establishment, poor stands of turfgrass may result. Some temporary surface drying is acceptable but should be kept to a minimum until germination is complete. Once seedlings have an established root system, watering can be less frequent and deeper (3 to 5 inches). Irrigation should not be overdone (do not create constant “muddy” conditions). Observe the drier areas of the lawn (sunny, high areas) for early signs of wilting. Irrigate, if feasible, to increase chances of successful establishment.
Straw mulch such as unrotted, weed seed free wheat, oat, rye, or salt hay can be applied at 50 to 90 lbs., (1 to 2 bales) per 1000 square feet. This offers a significant advantage for turfgrass establishment. Light mulching, where approximately 25% of the soil is visible through mulch, is all that is needed in most situations.
Mulching increases soil moisture retention. Morning dew is retained longer on the soil surface. Benefits include reduced watering needs and quicker seed germination.
In sloping areas and waterways where erosion is a consideration, heavier mulching is needed. To avoid smothering seedlings, partially remove mulch after germination occurs and 2–3 inch roots develop. In steep areas, erosion control matting with nylon netting or jute can also be applied over seeded areas and left in place after germination. These materials disintegrate over time and control soil erosion.