The Hawks lost eight of 11 in March before winning it all. Nearly the same story for Sidney Crosby's Penguins. They lost 7 of 11 in February, then won it all.
The Red Wings most-recent cup team lost 10 of 11 in February. And the Anaheim Ducks may be the best example of all, losing 17 of 25 in an ugly, post all-star performance that was forgotten by the time they hoisted the cup in June.