I used to discount early season setups at this latitude out of hand (given that we can have low-level instability issues into late May), but events like 4/9/15, 3/15/16 and 2/28/17 have given me a new respect for them. Heck, we've done better in oddball "off-season" months (even including 12/1/18) in recent years than we have in May and June. Last year also had that late March potential big day that largely busted, but still produced a few tornadoes.