Red Lake ice-out was May 7

 Warm temperatures and, more importantly, a high wind took out the ice on Red Lake and all the other water bodies except Trout Lake on May 7. 

Satellite photos showed Trout to still have some ice yesterday, May 8. Trout Lake is higher than other area lakes and that extra bit of elevation means the air temperature is cooler. It's also a bigger, round-shaped lake and deeper. All those things can make ice-out five days or so later than Red Lake.