Very hardy. It is a staple of most cool season lawn seed blends.

Even in my area, winter kill can be very significant. All depends on where you live.

Rated winter hardy to zone 3. That's pretty darn hardy........

Depends. Well-treated, it does well. Ill treated, it does ill.

It isn't self-repairing, so it does have a definitive lifespan, and once taken out, it won't come back or spread from surrounding clumps and has to be reseeded, so it acts like fescue instead of bluegrass in that regard.

Locally (borderline Zone 7A Pennsylvania), it performs better in every season except summer, when it looks like crap, comparatively speaking to the other three seasons (my neighbor has a PR lawn that he does care for extremely well), although it also goes into dormancy in winter when it also looks like crap.

Although I'm kind of judgmental on that, we should point out, and have my lawn trained not to pull that sort of thing. :-)

Any lawn can die back in bad weather, was not properly fed, has a disease, is not fully established. was planted at the wrong time, or is otherwise having major problems, regardless of its ratings, zones, or hardiness.

Depending on how "semi-shade" semi-shade is, you may find that it works for a while, but ultimately thins out and gives up as the season rolls on and carbohydrates run short. Summer takes its toll on any lawn, and shorting resources in spring can be problematic. Try to keep the lawn well-fed (feed this weekend as it's the perfect time), and water weekly at about an inch per watering to keep it going.

Zone 3?

https://mnhardy.umn.edu/varieties/grasses/turfgrasses

"Many grass species popular in other states, such as perennial rye grass, lack the hardiness to survive a winter of harsh temperatures or little insulating snow. "

Like I said, where I live, Zone 6a, if we have a cold winter with little snow cover, there will be significant winter kill.

i'm in zone 6b so should be fine.