Cold fronts this time of year in Minnesota don't do a lot to upset the fishing unless its a super deep front. We haven't seen any of those in a long while. The fish will still have the feed bag on even in lieu of a front, but you may have to snug up to weeds or tighter to rock piles and reef edges to get the fish. On most front right now the first 12 hours after the front passes can get dicey but you can still get fish.