Due to the mild winter it is possible that you may encounter some early season grub damage, either directly from the grubs themselves or by their predators (skunks and crows), especially on newly transitioning lawns to organics. Obviously that lack of any sort of deep freeze this winter has allowed the grubs to remain closer to the soil surface. With the warming spring weather they are in the root zone feeding on the turf grass roots. As such they are also easy prey to the skunks and crows.
The grubs will likely continue feeding until about the 1st week of May. What to do? While we have had limited opportunities; we have had success using Hb Nematodes on white grubs in their 3rd instar. Please see Insect Parasitic Nematodes for Turfgrass Pest Management from Ohio State for more information on proper application.
Realistically the damage from crows or skunks is going to require repair. There will still be plenty of time to make repairs and get the areas established before summer, especially if you use a quick germinating turf grass species like perennial ryegrass.
If you are in need of Hb nematodes please check out GreenMethods.com.
You should also know that a conventional approach (e.g. pesticide use of Dylox) is unlikely to have any affect given that the grubs are in their 3rd in star lifecycle stage.