Question
What is best grass for midwest states?

Answer
Good afternoon Monkey Dod:
Cool season grasses are what is grown north of a line through St. Lois Missouri. You did not give me a location so I will assume you are in the northern area.
The best time to plant a new lawn would be August through September.

I am sending you some web sites that will cover your question. Copy and paste them individually to your browser and hit "GO".

State Guide To Grasses: On this one simply scroll down and double click your state.
http://www.lawngrass.com/states/

Cool Season Grass Selection Minnesota:
http://www.sustland.umn.edu/maint/coolseas.htm


Turfgrass Cultivar Performance: This was a test of some of the grass cultivars by the the University of Illinois.
http://www.turf.uiuc.edu/extension/turfcultperform.html

Turfgrass Species Selection Ohio:
http://ohioline.osu.edu/hyg-fact/4000/4011.html


Seed mixtures are combinations of two or more species of grass, such as Kentucky bluegrass and perennial ryegrass.
Blends of grass seed are combinations of two or more cultivars/varieties of a single lawn species.
Cultivars (or varieties) are considered selections of a species. Cultivars may offer a variety of traits that set them apart from others in the species, including resistance to diseases or other stress, or perhaps improved color or hardiness. When combined in blends, each cultivar offers a variety of features to contribute to a diverse stand of lawn grasses able to withstand a number of stresses and problems better than one cultivar by itself.
Combining grass species and cultivars together helps create a uniform yet diverse stand of grasses in a lawn. Mixtures and blends of Kentucky bluegrass, perennial ryegrass, and fine fescues are usually use d in the midwest. The decision of which specific mixture or blend to use is based on site conditions and use factors.

Suggested Lawn Mixtures & Blends for Full Sun Areas
Kentucky bluegrass blend (3-5 cultivars)
Kentucky bluegrass blend/perennial ryegrass
Tall fescue blend (high traffic areas or hot, dry sites)
Fine fescue blend (low maintenance lawn - infrequent mowing)
Kentucky bluegrass/perennial ryegrass/fine fescue

For Sun and Shade
Kentucky bluegrass/fine fescue blend
Tall fescue blend may not be completely winter hardy in some areas, and may           require overseeding on a regular basis to maintain acceptable quality.


Deep Shade (in order of need for light)
Fine fescue blend (dry shade)
Rough bluegrass (wet shade) - low quality lawn
Shade-tolerant grasses have a limit on how much shade they can tolerate.

Have a good lawn!
Floyd McMahon