In many states, a judge who finds a noncompete too broad will narrow it — cut three years to one, or shrink a statewide territory down to a county — and then enforce the trimmed-down version. Wisconsin generally does not do that.
Under Wis. Stat. § 103.465, a covenant imposing an unreasonable restraint is illegal, void and unenforceable even as to any part of the covenant that would have been reasonable — Wisconsin courts do not narrow, or “blue-pencil,” an overbroad noncompete to make it enforceable.
There is an important qualification. Wisconsin courts have held that where an agreement contains restrictions that are genuinely separate and divisible — drafted as distinct obligations that can stand on their own — each may be analyzed independently. One unenforceable clause does not automatically take the rest of a well-drafted agreement down with it. Whether your restrictions are divisible is a question about how your particular agreement is written, and it is usually one of the first things worth looking at.
Two practical consequences follow. First, an aggressive letter quoting a very broad restriction is not the same thing as a restriction a court will enforce. Second, the reverse is also true: assuming your agreement is void because you have heard Wisconsin is employee-friendly is a bad way to make a decision that could put you in front of a judge on two weeks' notice.