It is not the weather it is the field.
I wonder if they designed a heater under the
turf to keep it from freezing.
no they didn’t. Unlike most fields in the midwest (Soldier Field, Lambeau, etc.) they’re are no heating coils under the University of Minn. field. They’re trying to lay coils on top of the field and then put a tarp over that...doesn’t appear to be working so well.
Nope. No coils under the turf. It’s a college stadium. They saw no need.
Lambeau Field was the first football field I ever heard of having heating coils under the turf.
However, even it could not help during the "Ice Bowl" as the coils didn't get hot enough to offset the sub-zero temps.
And the Vikes made four Super Bowls playing at The Met which I do not recall as having heating coils.
1962 NFL Championship game between the Giants and Packers was played in ripple sole shoes on a frozen field known as Yankee Stadium.