To find the start of Dunfield Spring Cutoff starting from the shack (Roadkill Cafe), cross two small drainage ditches. The first is right behind the shack, and the second comes shortly after. There is a third near the top of Thompson Canyon Trail
, but if you encounter it you've gone too far.
There is a tough section of climbing at about 0.7 of a mile and another shorter test at about the 1-mile mark. Both sections are short, so if you climb off it is no big deal. The view at the top is worthy of the work.