I did a lap yesterday (sunday), late morning and entered near the lake.  I would guess it was somewhere between a quarter to a half mile into the trail that I got stung by something. 

I didn't notice anything in the air just the sting out of nowhere.  I was moving pretty good at the time and didn't have a chance to look down, just swatted at whatever stung me and kept going.   

My guess is that there was a nest somewhere that others had stirred up and I just got lucky enough to ride through the area at a bad time.  Anyone else get stung on Sunday?
If I knew where the next was I'd take a can of killer out there, but I don't. 

So this is more of a heads up to watch out of the yellow jackets.