Came a bit early this year! We were expecting temps in the 40s to do the Devil's Washbowl loop and a few miles in climbing a short rise I noticed my rear wheel slipping when I stood to climb. A few seconds later it happened again, and the whole bike got squirmy. The further we went, the worse it got, until we ran out of crunchy road - we were trying to climb on the shoulder and the area with texture. Going down the other side was interesting, slow, and sketch.
We made our way along the route for a few more miles and diverted to pavement... Time to mount up the studs..!