Now to my question ... should I fertilize again with the Jonathan Green before winter? As I said, the sod was put down in mid-Sept so it has been in for one month now. I live in southern Westchester County, NY. It seems like the grass usually stops growing around here sometime in November. (Fyi, the Jonathan Green fertilizer is made out of bone meal, feather meal, blood meal, fish meal and molasses.)

Many thanks.

Apply some of your organic fertilizer and DO NOT forget to mulch mow copious amounts of autumn leaves into your lawn every fall.

If you want to give the soil a little boost for digesting the leaves spray with a little sugar water.

I use deer molasses. Not necessary but it gives the soil microbes a little food for digesting the leaves. You can use any sugar water though.

Good stuff!!

bone meal - useless unless you really need calcium and potassium.
feather meal - useless unless you plan to be around until the next ice age. Feathers do not decompose in your lifetime.
blood meal - not bad for a protein source in a mix like this. Blood is extremely fast release, so use only in small amounts.
fish meal - also not bad but in the small amount that must be in the bag, color it useless.
molasses - nearly useless. It will help awaken the bacteria in the soil.

In my opinion you will get a much better value (MUCH better!!) by buying a 50-pound bag of alfalfa pellets. Apply at 20 pounds per 1,000 square feet as often as you want or can afford. Weekly is not too often. Apply at least 3x per year with two of those apps going down in the fall before the grass stops growing. Even a bag of dog food has more and better protein than the fertilizer you mentioned. The top three items in a bag of organic fertilizer should be strong protein sources. Bone and feathers are not. Soybean, cottonseed, corn gluten, and alfalfa meal/pellets are the top sources of protein (not in that order). Sometimes you see meat byproducts listed on the label. That's good, too.