Avoid doing this during the time they are greening up. You can aerate them March through June. One job you can do now is over seeding them to produce a good winter color. Over seeding is done September through December. I would do it as soon as possible.
Rye grass gets a better start during warm weather.
Shrubs are also going dormant now. Do not prune or fertilize them. This may cause new growth to come out which could be damaged by cold. Prune shrubs again starting in February. The only exception would be spring flowering shrubs like azalea, forsythia and Loropetalum.