There is only one half way decent pre emergent that wont kill new grass seed. All the rest will kill any new grass, so you can;t seed and use a pre emergent.

For the Sod, find a "starter fertilizer (24-25-6 or the like- if you find Scotts starter with tenacity, you can use that) and apply it at half the recommended bag rate every 2 weeks until June first. On June 1, apply it at full bag rate and do nothing else but water properly until August and check back for further advice, Good luck

When did you seed? If it was more than 60 days ago you should be ok to put down pre-emergent.

Skip the Milorganite. It's very expensive and not what your new grass needs right now. Follow ridgerunner's recommendation for the sod, and I would actually suggest following the same regimen for the seeded area as well. If you want it to spread you have to feed it plenty of N.

I need to know when it's too late at night to post.

To clarify, if you are overseeding, pre-m (except for mesotrione and siduron) will kill the young grass plant shortly after germination. As j4c11 diplomatically points out, it will not kill already established grass as long as a period of time has passed since it germinated.

Thanks all - so the sod and seed have been down since Oct 2016, so I think I am good there if I dont overseed this spring.

So maybe for now just use a starter fert on both the grass and seed until the end of the season, or do you suggest since its been long enough to start with a pre-e?

So maybe for now just use a starter fert on both the grass and seed
until the end of the season,...

If "end of season" means June- yes. Come August, that will change.

or do you suggest since its been long
enough to start with a pre-e?

Feel free to use a pre-m. I like prilled prodiamine (Barricade), but it's hard to find w/o N content. If you can't find it w/o N, then you should skip the starter for the month you apply the pre-m w/N. jc411 can probably give you alternate forms. He is kinda the expert on fungicides and herbicides.

Pre-emergent and fertilizer are separate issues, though they often come mixed in the same bag at big box stores. They both need to go down, the pre-emergent in particular with a sense of urgency. Lowe's sells a Scott's Turf Builder with Crabgrass Preventer that covers 15,000 sq ft for about $60, so that would take care of both. Move to a starter fertilizer as recommended by ridgerunner starting with the April fertilizer app.

You will need to apply pre-emergent again in May.

I've read to get a few mows in before applying pre-e. I will get the pre-e down before end of next week, as temps will be warming up again.

I have not mowed yet this season, and we are supposed to get some light snow this weekend

Do you recommend getting a mow in before the pre-e?

Look for forsythia blooming or soil temperature reaching 50 degrees at 4" as indicators of when pre-m needs to go down, regardless of whether you mowed yet or not.