Sod Chicago - is it too late?
I personally would wait until Spring if you cannot get it down until late October but if your soil is nicely prepped go ahead I guess. We don't usually have a danger of soil freeze until after the first of the year. Snow will not hurt it but frost could do a number on it and you can help fight against this by rinsing it off early morning so long as temps stay above freezing during the day.
Do make sure you water it in as you go and roll it with a half full landscape roller to ensure soil contact.
If you wait to Spring you might look into hydroseeding as suggested. It is not as immediately gratifying as sod but turf will establish faster and it is much cheaper.
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