"twfsa" wrote:
Moved into new house a week ago new sod in yard, I have been running the
sprinkler 4 times a day plenty wet.

We live in the midwest, temps in the lower 30's at night, mid 50's to low
60's in the day.Heat tape on the exterior water pipeing.

How long should I water this sod till I winterize the sprinkler system?

You don't say how *long* each of the waterings are, but I assume they're short
waterings to just keep the sod moist. At this stage anything more is a waste
of water (after sod is placed, frequent shallow waterings are the order of the
day until the sod starts to bind).

Once the sod starts to bind (i.e., you can't easily pull up a piece of sod
anymore), you can cut down the # of waterings, and make them a bit longer. The
whole point to make the roots "reach" for the water so you don't end up with
turf with shallow roots.

As to how long, given you're in Chicago and it's early November, it's basically
go until it looks like you're going to get multiple hard freezes in a row
(probably the next big cold front). Once the grass freezes hard (upper couple
of inches below freezing), the grass is going to go dormant anyhow, so you might
as well blow out the system around that point. Sodding this late in the year,
it's basically walking a tightrope -- you want to water as long as the grass
continues to root, but you don't want to ruin your sprinkler heads by letting
them get caught in a really hard freeze.