The devil is in the details. Based on initial reports, I was assuming (perhaps naively) that the status match was to a similar level held at competitors. That's not the case if the T&Cs posted by nddomer04 apply. You have to be at least mid-tier at another airline (generally requiring 50k miles) to be given Summit status at Frontier.

ExitRowAisle
A Dissatisfied 2nd Class Starwood Platinum Member